SUZUKEN – Nowej Generacji Monitor Aktywności Fizycznej Lifecorder PLUS
• Jednoosiowy akcelerometr
• Zatwierdzony przez ponad 200 badań, opublikowanych w wielu pracach naukowych
• Przyjazny i łatwy w użytkowaniu
• Pamięć wewnętrzna do 60 dni
• Oprogramowanie PC z pełnym zakresem pomiaru aktywności
Monitor Aktywności Fizycznej Lifecorder Plus jest idealnym urządzeniem do rejestracji dokładnych informacji dotyczących prowadzonego stylu życia. Intensywność (5 poziomów), dzienny czas trwania aktywności fizycznej, wydatek energetyczny, ilość kroków oraz przebyta odległość są niezbędnymi informacjami potrzebnymi do monitorowania stylu życia. Port USB pozwala na łatwe i szybkie przekazywanie danych.
Innowacyjna technologia z ceramicznym czujnikiem, poza zliczaniem ilości wykonanych kroków, umożliwia odczytanie ciężaru, generowanie częstotliwości i zapisanie poziomu intensywności aktywności fizycznej.
Ponad 200 badań i analiz opublikowanych na całym świecie świadczą o precyzji, wartości i niezawodności tego urządzenia. Jednoosiowa technologia akcelerometru eliminuje artefakty, które mogą zmieniać wiarygodność pomiarów. Duży graficzny ekran LCD liczy kroki, odległość, wydatek kaloryczny, minuty aktywności fizycznej. Dane pomiarów są analizowane i zapisywane, a następnie przesyłane do komputera w celu analizy codziennych, tygodniowych i miesięcznych raportów. Dane te mogą być zarządzane w przyjaznym i łatwym w obsłudze oprogramowaniu Fitmate 2.0, a także w kompatybilnym bezpłatnym oprogramowaniu PASS Personal.
Nie wszystkie kroki są takie same!
W przeciwieństwie do innych krokomierzy czujnik wahadła i technologia Lifecorder, filtrują każdy ruch oraz drganie, i liczą jedynie rzeczywistą ilość kroków. Mierzona jest również intensywność aktywności fizycznej, na podstawie której zapisywany jest, czas trwania aktywności umiarkowanej lub wyższej intensy.
|Biorąc pod uwagę wartości RMR, raport zawiera szczegółowe informacje odnośnie wydatku energetycznego w trakcie wysiłku (Activity Energy Expenditure- AEE) oraz szczegółowe informacje odnośnie całkowitego wydatku energetycznego (Total Energy Expenditure- TEE)|
|W raporcie znajdują się dane na temat pomiaru wartości tygodniowych oraz z uwzględnieniem każdego dnia|
|Podsumowanie wyników pomiarów|
Jednoosiowy, solidny akcelerometr z portem USB
1. Statystyki aktywności: Szczegółowe informacje na temat wszystkich danych pobranych z Lifecorder PLUS w okresie monitorowania.
2. Czas aktywności: Raport pokazuje dzienny i średni czas trwania wysokiego poziomu aktywności fizycznej (powyżej 3 METs).
3. Poziom aktywności fizycznej: Lifecorder PLUS dokonuje pomiarów na 5 różnych poziomach intensywności aktywności fizycznej. Intensywność i wydatek energetyczny mogą być porównywane u osób o różnych masach ciała.
4. Dzienny wydatek energetyczny: Końcowy wykres kołowy podsumowuje graficznie średnie, dzienne zużycie energii i podkreśla udział dziennego wydatku energetycznego w całkowitym zużyciu.
5. Parametry aktywności: Parametry aktywności można oglądać za pomocą ekranu LCD. Pamięć monitorowanej aktywności jest dostępna przez 7 kolejnych dni.
Specyfikacja techniczna Lifecorder PLUS
• lifecorder PLUS obrazuje: liczbę kroków, ilość minut aktywności, kalorie, przebytą odległość, wykres intensywności aktywności fizycznej (MET)
• ustawienia: kroki, minuty, odległość, intensywność aktywności fizycznej
• szacowanie postępów: protokoły z odbytej aktywności fizycznej, tj. liczba przebytych kroków, spalonych kalorii
• wymiary (bez paska): 70x42x18,6mm (szer. x wys. x dł.)
• waga (z baterią): 48g
• bateria: 1szt, typ CR20323V
• żywotność baterii: 2 miesiące
Funkcje oprogramowania, ustawienia komputera
• ilość kroków
• ilość minut aktywności fizycznej
• zakres intensywności
• wybór trybu wyświetlenia
• blokada pamięci
Funkcje oprogramowania, wykresy graficzne
• dzienna ilość kroków
• średnia tygodniowa ilość kroków
• dzienna ilość minut aktywności fizycznej
• średnia tygodniowa ilość minut aktywności fizycznej
• dzienny wydatek energetyczny
• program postępu i redukcji masy ciała
• dzienna aktywność fizyczna wraz ze wszystkimi wartościami pomiaru
• ranking aktywności
• raport podsumowujący
• raport porównujący (tylko wydruk)
Przykładowe referencje bibliograficzne z użyciem akcelerometrów Lifecorder
Efficacy of an Accelerometer-Guided Physical Activity Intervention in Community-Dwelling Older Women (2009).
Daisuke Koizumi, Nicole L. Rogers, Michael E. Rogers, Mohammod M. Islam, Nobuo Takeshima. Journal of Physical Activity and Health. July 2009.
This research examined the efficacy of a lifestyle physical activity intervention for improving quality of daily physical activity and cardiorespiratory endurance in elder women by using Kenz Lifecorder. The result was quantity and quality of daily physical activity as well as cardiorespiratory endurance of participants increased significantly by using Lifecorder.
Method for Assessing Off-loading Compliance (2009). Ryan T. Crews, David G. Armstrong, Andrew J.M. Boulton.
Journal of the American Podiatric Medical Association; March/April 2009. Vol 99. No.2.
It is well known that prescribed footwear is useful to protect diabetic patients from foot ulcers. However many of them are not compliant in using footware. This research was done to recommend wearing footware to diabetic patients. In this research, Lifecorder PLUS was put on the footware and measure pateint’s compliance.
Comparison of Activity Monitor Output in Free Living Conditions (2008). James C. Hannon, Mark G. Abel, Tia Lillie, Katie Sell, David Anderson, Geri Conlin, Kelly Bird. University of Utah, Salt Lake City, UT. University of Kentucky, Lexington, KY. Hofstra University, Hempstead, NY. Weber StateUniversity, Ogden, UT.
The purpose of this study was comparing Actigraph GT1M to Kenz Lifecorder EX outputs of steps counts and activity energy expenditure under free- living conditions. Ten male and ten female participated and wore three activity monitors on their waistline during walking hours for one day. The result was that Lifecorder EX produced similar results.
Validity of Downloadable Pedometers during Laboratory and Overground Walking in Young and Older Adults (2008). Nora E. Miller, Scott J, Strath, Ann M. Swartz, Michael S. Loy, Lauren A. Ewalt. University of Wisconsin – Milwaukee, WI.
This study examined the accuracy of downloadable pedometers such as Omron HJ-700IT-T54 and Kenz Lifecorder EX. Eighty-four volunteers participated, and they completed a treadmill and an over ground walking protocol with wearing those pedometers. The result was that the smallest error range for both slower and faster conditions was Lifecorder EX.
The effect of insulin resistance improvement due to lifestyle intervention on overweight perimenopausal Japanese woman: A Preliminary study. Hiromitsu Chihara, Rieko Kawase, Yasuo Otsubo, Yoshie Hiraizumi, Toshiyuki TakeshitaJ Nippon Med Sch 2008; 75: 15-22.
Researchers hypothesized that body composition and biomarkers obesity would be affected by administration of a nutrition and exercise regimen. There was no significant change in weight, body mass index, or body composition after 12 weeks. Daily physical activity was measured with a computerized accelerometer (Lifecorder EX, Suzuken, Nagoya, Japan) Daily physical activity related to energy consumption was slightly but not significantly increased. Therefore, we concluded that longitudinal mild interventional on daily physical activity and nutrition could change insulin sensitivity even without weight reduction.
Prediction of VO2max with daily step counts for Japanese adult women. Zhen-Bo Cao, Nobuyuki Miyatake, Mitsuru Higuchi, Kazuko IshikawaTanaka, Motohiko Miyachi, Izumi Tabata. 13 October 2008
The purpose of the study was to develop a new non-exercise VO2max prediction model using a physical activity (PA) variable determined by pedometer (Kenz Lifecorder)-determined step counts (SC, steps day) in Japanese Women aged 20-69 years old. When the new prediction equation developed by multiple regression to estimate VO2max from age, BMI, and SC was applied to the Validation group, predicted VO2max correlated well with measured VO2max, suggesting that SC was a useful PA variable for non-exercise prediction of VO2max in Japanese women.
How many days of pedometer use predict the annual activity of the elderly reliably? Fumiharu Togo, Eiji Watanabe, Hyuntae Park, Akimoto Yasunaga, Sungjin Park, Roy J. Shephard, and Yukitoshi Aoyagi. January 2008.
To examine the variability of step counts for 1 yr, determining the minimum number of days observation needed to obtain reliable estimates of annual physical activity. Healthy Japanese aged 65-83 yr get pedometers (Kenz Lifecorder) on every day to measure the number of steps. When estimating annual step counts, seasonal and/or random sampling of data allows collection of reliable data during substantially fewer days than needed for consecutive observations.
Validity of Physical Activity Monitors in Assessing Energy Expenditure In Normal, Overweight, and Obese Adults (2008). Lauren A. Ewalt, Ann M. Swartz, Scott J. Strath, Nora E. Miller. Keith P. Gennuso, Elizabeth K. Grimm, Michael S.Loy. Univerisyt of Wisconsin-Milwaukee, Milwaukee, WI.
This research determined the validity of three physical activity monitors, including Lifecorder, in assessing energy expenditure during treadmill walking in normal, overweight, and obese adults. The results showed that energy expenditure difference scores derived from all pedometers were significantly different for treadmill speeds.
Comparison of Activity Monitors to Count Steps and Estimate energy Expenditure During Treadmill Ambulation (2008). Mark G. Abel, James C.Hannon, Katie Sell, Tia Lillie, Geri Conlin, David Anderson, Kelly Bird. University of Kentucky, Lexington, KY. University of Utah, Salt Lake City, UT.Hofstra University, Hempstead, NY. Weber State University, Ogden, UT.
The purpose of this research was to compare and validate the steps counts, activity energy expenditure and total energy expenditure from several accelerometers including Lifecorder. As a conclusion of this study, Lifecorder provided the most accurate step counts at the slowest walking speed.
Effect of free-living daily physical activity on salivary secretory lgA in elderly. Kazuhiro Shimizu, Fuminori Kimura, Takayuki Akimoto, Takao Akama, Shinya Kuno, Ichiro Kono. Medicine & Science in Sports & Exercise 2007.
To aim of this experiment was to assess the relationship in elderly subjects between free-living daily physical activity and mucosal immunity, especially salivary serectory immunoglobulin A (SIgA). Elderly volunteers (114 men and 170 women) participated and wore Kenz Lifecorder to assess the physical activity in this study. The data obtained were stratified by pedometer determined steps per day using quartiles for distribution. Saliva flow rates showed no significant differences across quartiles. A free-living daily physical activity level of approximately 7000 steps per day might be regarded as a moderate daily physical activity target for elderly people to improve mucosal immune function.
Physical activity level necessary to prevent deterioration of walking ability in patients of chronic renal failure on maintenance hemodialysis.
Kutsuna T, Matsunaga A, Nanri Y, Saitoh M, Yonezawa R, Matsumoto T, Ishii A, Yamamoto K, Sato T, Sawari T, Masuda T; Graduate School of Medical Sciences, Kitasato University Physiotherapy 2007; 93(S1):S271
Purpose: To prevent the deterioration of walking ability in the patients of chronic renal failure , it is necessary to establish an appropriate exercise guidance as well as medical managemnet. Participants: 37 male and 64 female Hemodialysis(HD) patients aged 63±11 years are devided in two Groups. Group A: (PA time<60 minutes) Group B (PA time>60 minutes). Methods: PA time was recorded over a week using an accelerometer (Lifecorder, Suzuken), and MWS was measured as walking ability while the patient walked a distance of 10 meters at maximum walking speed. Analysis: The clinical characteristics and MWS were compared between the two groups using unpaired t-tests. The change in MWS measeured before and after the study period was analyzed using two-way ANOVA. Results: No differences in clinical characteristics between the 2 groups. MWS measured was siginificantly lower in group A than that in group B. Conclusion: HD patients should maintain the PA for 60 minutes and more a day as PA time.
Age and Gender Differences in the Physical Activity Patterns of Urban Schoolchildren in Korea and China.Taro Yamauchi, Soo-Nam Kim, Zhongfan Lu, Naoto Ichimaru, Ryuichi Maekawa, Kazumi Natsuhara, Ryutaro Ohtsuka, Huan Zhou, Shintaro Yokoyama, Wenquan Yu, Minxue He, She-Hwan Kim, Masaru IshiiJ Physiol Anthoropol 26(2): 101-107,2007.
Physical activity in childhood is important as it may establish adult behavior. The observation has been done by measuring of 159 school children in two grades from urban areas of Korea and China. Kenz Lifecorder is used for recording acceleration for 7 consecutive days. Physical activity levels (PALs) were higher in the fifth grade boys and girls than in the eighth grade children. The interesting thing is that girls tended to have higher PALs than boys. Daily variation in physical activity was observed in Korea. Children were less active on Sundays.
Physiological Effects of Shinrin-Yoku (Taking in the Atmosphere of the Forest)-Using Salivary Cortisol and Cerebral Activity as Indicators- Bum-Jin Park, Yuko Tsunetsugu, Tamami, Kasetani, Hideki Hirano, Takahide Kagawa, Masahiko Sato, Yoshifumi Miyazaki. J Physiol Anthropol 26(2): 123-128, 2007
The purpose of this study is to examine the physiological effects of Shinrin-yoku. 12 subjects(students) aged 22.8±1.4 yr are divided into two groups. One was sent to a forest area and the other was sent to a city area. Kenz Lifecorder is used for comparing exercise load during forest and city walking. The cerebral activity in the prefrontal area and the concentration of salivary cortisol of the forest group was significantly lower than that of the group in the city area. The results of the physiological measurements show that Shinrin-yoku can effectively relax both people’s body and spirit.
Comparison of Kenz Lifecorder EX and ActiGraph Accelerometers in 10-yr-old children. MCCLAIN, JAMES J. 1; SISSON, SUSAN B. 2; WASHINGTON, TRACY L. 1; CRAIG, CORA L. 3; TUDOR-LOCKE, CATRINE 1,3. Medicine & Science in Sports & Exercise. 39(4):630-638, April 2007.
This study compared Kenz Lifecorder EX and ActiGraph Accelerometers in 10-yr-old Children. The result was there was no difference between Lifecorder and ActiGraph steps. However, a non significant trend was observed between Lifecorder and Actigraph.
Effect of daily walking on subjective symptoms, mood and autonomic nervous function. Sokichi Sakuragi, Yoshiki Sugiyama. J Physiol Anthropol 25(4): 281-289, 2006.
The purpose of this study was to investigate the effects of daily walking on subjective symptoms as well as on mood and autonomic nervous function in people who take no medication but have some general physical complaints. To ensure a level of daily activity, all subjects were requested to wear a lifestyle record machine(Lifecorder, Suzuken, Japan) which can record motor activities by acceleration sensors all day. Assessing their symptoms by the Cornell Medical Index(CMI), and mood states by a profile of mood states(POMS) and a frontal alpha laterality ratio. The daily walking can improve mood states and shift autonomic balance to parasympathetic predominance, and may consequently contribute to the reduction of subjective symptoms.
The effects of unsupervised exercise training on physical activity and physiological factors after supervised cardiac rehabilitation. Kazuhiro P. Izawa, Satoshi Watanabe, Koichiro Oka, Toru Kobayahshi, Naohiko Osada and Kazuto Omiya. J Jpn Phys Ther Assoc 9: 1-8, 2006.
Exercise maintenance after supervised cardiac rehabilitation is important in maintaining both physical activity and psychological factors. However, there is no evidence of the effects of unsupervised cardiac rehabilitation of Japanese cardiac patients. To measure the patient’s physical activity, Kenz Lifecorder electric pedometer(Suzuken Co.,Ltd, Nagoya, Japan) was chosen due to its reliability and validity of the data. By dividing into two groups between MS training and the control group, we concluded that unsupervised exercise training and low-level MS training performed after supervised cardiac rehabilitation may effectively maintain not only physical and peak VO2 but increase MS.
Effect of aging on gait patterns in the healthy elderly. Tasuku Kimura, Hiromitsu Kobayashi, Eijun Nakayama, Michiko Hanaoka. March 9 2006.
The free gait of 52 healthy elderly persons aged 65 yr or older was examined in Ishikawa Pref. Japan. In order to figure this out, they were asked to wear Kenz Lifecorder EX and divided into two groups between elderly group and young group to compare. The elderly were weaker in grip strength and had shorter single-leg balance with eyes open than the young adults. Negative correlations between age and walking speed, as measured directly or in terms of dimensionless numbers, and between age and stride length were also observed within the elderly group. Slow speed may be related to low daily activity, reduced muscle power, and diminished balance ability. Long stance phase duration and slow speed in the elderly could be an adaptive characteristic in response to impaired balance.
Effect of Daily Physical Activity on Systemic Arterial Compliance in Middle-aged and Elderly Humans: Special References in Amount and Intensity of Physical Activity. Takumi Tanabe, Seiji Maeda, Jun Sugawara, Takeshi Otuki, Shinya Kuno, Ryuiichi Ajiska and Mitsuo Matsuda (2006). Internationla Journal of Sports and Health Science Vol.4, 489-498, 2006.
This research examined the relationship between systemic arterial compliance and intensity levels of daily physical activity. In this research, Lifecorder was used to measure daily physical activity and physical activity time. From this research, authors found out that increases not only in the amount of total daily physical activity but also in time of daily physical activity of mild-moderate intensity could improve age- induced reduction of systemic arterial compliance.
Validation of the Lifecorder EX Activity Monitor. Albright, Carolyn; Hultquist, Cherilyn N.; Thompson, Dixie L. FACSM (2006). Medicine & Science in Sports & Exercise. 38(5).
These authors performed a validation study of the Lifecorder EX compared to indirect calorimetry (IC) to examine its accuracy as a step counter, a method to calculate resting metabolic rate (RMR) and in measuring energy expenditure (EE) during activity. The authors found that the „Lifecorder EX underestimated RMR for males and females and consistently underestimated EE for both genders during treadmill walking and running. Step counts were only inaccurate at slow walking speeds, but the level of undercounting was small in comparision to many previously investigated pedometers.” Step undercounts were only found at speeds of 2MPH (8.4%)and 2.5 MPH (1.7%). Lifecorder underestimated the net and gorss EE compared to IC. The average difference in EE for all stages was 4.41 and 5.52 kcals fo net and gross EE, respectively. Lifecorder significantly underestimated RMR for both genders; mean difference =194.22 +/- 145.48 kcals/day.)
Additional physical activity during cardiac rehabilitation leads to an improved heart rate recovery in male patients after coronary artery bypass grafting. Shinji Sato(Ph.D), Shigeru Makita(MD),Mitsuru Majima (MD). Circulation Journal Vol.69 January 2005.
The aim of this study was to determine whether or not additional physical activity outside the cardiac rehabilitation (CR) program would improve the heart rate recovery (HRR) in male patients after coronary artery bypass grafting (CABG). Twenty male patients were enrolled in a supervised CR program at 2 weeks after CABG, and devided into an active group or a less-active group. Lifecorder was used to collect the date of each patient’s movements for over the final 3 days of the rehabilitation program. The time constant of HRR immediately measured after pedaling exercise was assessed at baseline and after the 2-week CR program. The result suggest that additional physical activity during a CR program may lead to an improved HRR in patients after CABG. Therefore, post-CABG patients should increase their level of physical activity in addition to that in the CR to improve their cardiac autonomic control.
Long-period accelerometer monitoring shows the role of physical activity in overweight and obesity. M Yoshioka, M Ayabe, T Yahiro, H Higuchi, Y Higaki, J St-Amand, H Muyazaki, Y Yoshitake, M Shindo and H Tanaka (2005). International Journal of Obesity 1-7.
This study investigated the association of physical activity with overweight and obesity in Japanese 400 men and 388 women using Kenz Lifecorder. Number of steps and time spent in moderate and vigorous physical activity per day. The result indicated that overweight and obese participants had a lower step rate was spending less time for moderate to vigorous physical activity.
Pedometer Accuracy and Intensity Distribution of Physical Activity in Younger versus Older Subjects. Makoto Ayabe, Kohsaku Takayama, Kojiro Ishii, Akira Kiyonaga, Munehiro Shindo, Hiroaki Tanaka (2005). Official Journal of the American College of Sports Medicine, Vol 37, No5, Supplement S115, abstract 595.
This study investigated the pedometer accuracy (by using Lifecorder) in 17 younger and 28 older adults. Authors showed that while active elderly had higher daily step count compared to inactive elderly, the increased activity came mostly from low intensity activity and not from moderate or vigorous activity. This demonstrated the importance of measuring low intensity physical activity especially in elderly.
Efficacy of a multicomponent program (patient-centered assessment and counseling for exercise plus nutrition (pace+Japan) for lifestyle modification in Patients with essential hypertension.
Shinichiro Miura, Yukio Yamaguchi, Hidenori Urata, Yuki Himeshima, Noriko Otsuka, Sayo Tomita, Koji Yamatsu, Satoshi Nishida, Keijiro Saku. Hypertens Res 2004; 27: 859-864.
It is very difficult for hypertensive individuals to modify their lifestyles and maintain the changes. We assessed if a multicomponent program based on behavior theory and social cognitive theory would be effective for treating patients with essential hypertension. All patients wore an accelerometer (Lifecorder, Suzuken Co.,Ltd, Nagoya, Japan) on their waist to investigate the effect of the interventions on daily physical activity. Urinary sodium extraction was determined to siginificantly predict systoric blood pressure as assessed by step-wise selection. In addition, the partial correlation coefficient of systoric blood pressure with Urinary sodium extraction was 0.361 as assessed by a multiple regression analysis. Therefore, PACE + Japan follow up conseling was associated with a reduction in systoric blood pressure, which in turn was associated with reduction in Urinary sodium extraction. This new program may be effective for reducing blood pressure in hypertensive.
The use of uniaxial accelerometry for the assessment of physical-activity-ralated energy expenditure: a validation study against whole-body indirect calorimetry. Hideaki Kumahara, Yves Schtz, Makoto Ayabe, Mayumi Yoshioka, Yutaka Yoshitake, Munehito Shindo, kojiro Ishii and Hiroaki Tanaka (2004). British Journal of Nutrition, 91-235-243. The Autors 2004.
This research investigated the accuracy of uniaxial accelerometer such as Lifecorder for assessing total energy expenditure and physical activity related energy expenditure over a 24 hour period. Walking exercise of 30min was performed on a horizontal treadmill. The accelerometer significantly underestimated TEE and PAEE.
The Physical Activity Patterns of Cardiac Rehabilitation Program Participants. Makoto Ayabe, Peter H. Brubaker, Devon Dobrosielski, Henry S. Miller, Kojiro Ishi. Takuya Yahiro, Akira Kiyonaga, Munehiro Ahindo , Hiroaki Tanaka (2004). Journal of Cardiopulmonary Rehabilitation 2004;24:80-86.
This investigation aimed to examine the physical activity patterns of cardiac rehabilitation program (CRP) participants. The investigation enrolled 53 male and 24 female CRP participants between 46 and 88 years of age. By means of a uniaxial accelerometer (Life-Corder), the amount of physical activity (in kilocalories) and the time spent in physical activity at light (<3 metabolic equivalents [METs]), moderate (3 to 6 METs), and vigorous (>6 METs) intensity were evaluated. In addition to these variables, the MET levels for the CRP and non-CRP periods were calculated. The weekly amount of physical activity energy expenditure averaged 1597 ± 846 kcal/week, and the time spent in light, moderate, and vigorous physical activity averaged, respectively, 375.5 ± 124.5 minutes, 125.2 ± 109.4 minutes, and 5.7 ± 12.8 minutes per week. These levels were significantly lower on non-CRP days than on CRP days: 177 ± 113 versus 299 ± 161 kcal/day and, respectively, 49.3 ± 19.3 versus 59.7 ± 19.8 minutes, 10.5 ± 14.6 versus 26.4 ± 20.4 minutes, and 0.4 ± 1.7 versus 1.4 ± 3.0 minutes per day. These results indicate that the amount of physical activity was generally adequate on CRP days, but failed to reach target levels on non-CRP days. Thus CRP participants, when it is medically appropriate, should be encouraged to incorporate lifestyle physical activity, additional exercise, or both on non-CRP days to supplement their caloric expenditure from CRP exercise sessions.
Relationship between Accumulated Walking and Body Composition in Middle-Aged Women. Thompson, D. L., J. Rakow, and S. M. Perdue (2004). Medicine and Science in Sports and Exercise, 36 (5), 911-914.
The same 10 models as Crouter,SE, et al (2003) were tested at self-selected speeds over a 400m walk. Praised for intramodel reliability (>0.99) was Lifecorder, Omron HJ-105, New-Lifestyles NL-2000, and the Digi-Walker. „Lifecorder, NL-2000, and Digi-Walker were the only pedometers accurate to be within 3% of the actual steps taken.”
The use of uniaxial accelerometry for the assessment of physical-activity-related energy expenditure: a validation study against whole-body indirect calorimetry. Kumahara, Hideaki 1,2; Schutz, Yves 1,*; Ayabe, Makoto 2; Yoshioka, Mayumi 3; Yoshitake, Yutaka 4; Shindo, Munehiro 5; Ishii, Kojiro 2; Tanaka, Hiroaki 5 (2004).British Journal of Nutrition.2004, 91(2):235-243.
This study assessed the total energy expenditure and the levels of physical activity in free-living conditions with non-invasive techniques remains a challenge. Lifecoder was used to measure 24h energy expenditure of seventy-nine Japanese subjects. The result was accelerometer underestimate TEE and PAEE. However, there was a correlation between the two values.
Daily physical activity assessment: what is the importance of upper limb movements vs whole body movements? H Kumahara1, H Tanaka2 and Y Schutz1 (2004). International Journal of Obesity Volume 28, Number 9, Pages 1105-1110.
Study utilized Lifecorder in 88 subjects as measure of whole body movements. Authors concluded that while upper body movement’s contribution to nonexercise activity thermo genesis (NEAT) can be significant,” their contribution to energy expenditure is lower than whole body movements thus indicating that the weight-bearing locomotion activities may be a key component of NEAT.”
Comparison of 2 accelerometers for assessing daily energy expenditure in adults. H.Kumahara, et al (2004). Journal of Physical Activity and Health, 1, 270-280.
Compared the performance of 2 accelerometers (Lifecorder and Tritrac-R3D) to estimate the total energy expenditure (TEE) and the physical activity related-energy expenditure (PAEE) in daily living conditions. There was a highly significant correlation between measured TEE and estimated TEE. Both accelerometers underestimated TEE and PAEE with Lifecorder outperforming the Tritrac-R3D (TEE- -9% v -12%; PAEE -10% v -55%). The conclusion was that Lifecorder „has the potential to be helpful in quantitative assessment of energy expenditure in epidemiological and clinical settings, although the inherent limitations of waist-worn accelerometer devices will remain.”
Pedometer Measures of Free-Living Physical Activity: Comparison of 13 Models. Schneider, Patrick L., S. E. Crouter, and D. R. Bassett, Jr. (2004). Medicine and Science in Sports and Exercise, 36 (2), 331-335.
Pedometers were tested during normal daily activity and worn for 24 hours. Researchers used Lifecorder. Digi-Walker SW-701, and Digi-Walker SW-200 as the criterion pedometer. The authors deemed these „suitable for applied physical activity research.”
Accuracy and Reliability of Ten Electronic Pedometers for Measuring Steps over a 400-m Walk. P.L. Schneider, S.E. Crouter, O. Lukajic, D.R. Bassett, Jr., FACSM (2003). University of Tennessee, Knoxville, TN Mediceine & Science in Sports & Exercise, 2003.
This study determined the accuracy and reliability of electric pedometers, including Kenz Lifecorder, measuring steps. The method was participants walked 400-m around an outdoor track while wearing pedometers of the same model. Result of Kenz Lifecorder and New Lifestyles were the most accurate in counting steps and displaying values.
Validity of 10 Electronic Pedometers for Measuring Steps, Distance, and Energy Cost. Scott Crouter, Patric Schneider, Murat Karabukut, David Bassett. Department of Health and Exercise Science, The University of Tennessee, Knoxville, TN Medicine & Science in Sports & Exercise Vol.37, No.10, pp.1673-1679, 2005.
This study examined the effects of walking speed not the accuracy and reliability of 10 pedometers such as Kenz Lifecorder (KZ) and New Lifestyles 2000 (NL). Methods: Ten subjects walked on a treadmill at various speed for 5 min stages. Simultaneously, an investigator determined steps by a hand counter and energy expenditure (kcal) by indirect calorimeter. Each brand was measured on the right and left sides.
Pedometer Measures of Free-Living Physical Activity: Comparison of 13 Models. Patrick L. Schneider, Scott E. Crouter, and David R. Bassett, Jr (2003).Department of Health and Exercise Science, University of Tennessee, Knoxville, TN. Medicine & Science in Sports & Exercise Vol.36, No.2, pp.331-335,2004.
This study compared the step values of multiple pedometers over a 24-h period such as Lifecorder, New Lifestyles, and so on. Total of 20 participants wore two pedometers for a 24-h period. Lifecorder, Yamax SW-200, New Lifestyles, and Yamaz Digi-Walker appear to be suitable for the most researches.
Validity of a questionnaire for assessment of physical activity in the Japan arteriosclerosis longitudinal study. Harada, A 1; Naito, Y 1; Inoue, S 1; Kitabatake, Y 1; Arao, T 1; Ohashi, Y 1 (2003). Medicine & Science in Sports & Exercise. 35(5) Supplement 1:S340.
This study used Lifecorder as the gold standard for physical activity measurement and compared it to the Physical Activity Questionnaire (PAQ). They found the PAQ „correlated with that determined by the Lifecorder moderately, these data indicate that PAQ has adequate levels of validity in epidemiological studies.”
Effectiveness of Long-term Intervention in Physical Activity of Type 2 Diabetics (prosoective randomized controlled group study for 1 year using a unique Activity Monitor) Masahiro Yokochi, Mitsuro Niinomi, Yasuhisa Kato, Yuko Yanbe, Kazuyo Tsushita, Yutaka Ohiso (2002). J. Japan Diab. Soc. 45(12): 867-874 Department of Rehabilitation Unit, Nagoya National Hospital, Department of Internal Medicine, Nagoya National Hospital, Research Institute of Health, Aichi Kenko no Mori, Department of First Internal Medicine, Nagoya University.
In this research, Lifecorder was used to evaluate and measure physical activity level for daily exercise and diabetic glucose control for long-term. As a result, the continuation of intervention in physical activity was effective for maintaining habitual exercise and improving metabolic changes. Exercise and walking is highly recommended for Type 2 diabetics.
Validity assessment of daily expenditure in a respiration chamber by accelerometry located on the waist vs the wrist or in combination. Kumahara, H 1; Yoshioka, M 2; Ishii, K 1; Yoshitake, Y 3; Shindo, M 4; Schutz, Y 5; Tanaka, H 4 (2002). Medicine & Science in Sports & Exercise. 34(5) Supplement 1:S140.
This study tried to determine if the addition of a wrist-based Lifecorder to a waist-based Lifecorder increased the accuracy of energy expenditure measurement. Authors concluded the while the results from both locations correlated with actual energy expenditure, the waist location was more accurate and that the addition of the wrist location did not substantially improve the degree of prediction of daily energy expenditure. „as a result, single accelerometer located on the waist level has sufficient validity for estimation of daily energy expenditure in confined conditions.”
Comparison of Accelerometry and Oxymetry for Measuring Daily Physical Activity. Yumiko Yokoyama1), Takashi Kawamura4), Akiko Tamakoshi2), Akiko Noda3), Makoto Hirai1), Hidehiko Saito5) and Yoshiyuki Ohno2) (2002).Circulation Journal Vol. 66 (2002), No. 8 751-754 .
This lab-based study assessed the validity of Lifecorder in measuring daily physical activity, the energy consumption calculated by Lifecorder, with respiratory gas analysis as a reference in 45 non-athletes during various exercise tests. „There were strong linear relationships between the measurements during the progressively graded treadmill test, with an overall pearson correlation coefficient of 97. The mean estimated difference ranged from -0.77 to .027 kcal/min and the coefficients of variation from 13.2% to 22.2%.
However, the difference between the methods was not negligible for individual subjects. Accelerometry overestimated energy expenditure during short-step walking, and underestimated it during long-step walking. No significant difference in energy expenditure was found according to the type of shoes worn. Cycling activity was not recorded by accelerometry. Accelerometry is a reasonably accurate and feasible method for evaluating the physical activities of non-athletes, and could be a common tool for epidemiological research and health promotion despite its limitations.
Effective Intevention of Physical Activity of Type 2 Diabetics Using the Pedometer with Large Memory Acceleromter. Y. Kuwayama, K. Thsushita, M. Niinomi (2001). Health Promotion Wing Aichi Comprehensice Health Science Center, Nagoya National Hospital. Japan Clinical Sports and Medicine Vol.9, No.1, 2001.
This study examined how walking effect on Type 2 diabetes by using Lifecorder. Participants wore Lifecorder for 6 months, and they were regarding life style monthly based on the data from Lifecorder. On the other hand, another group kept a diary about their physical activities without wearing Lifecorder. As a result, Lifecorder was effective to encourage diabetics to control themselves.
ASSESSMENT OF PHYSICAL ACTIVITY USING A TWO-AXIAL ACCELEROMETER IN A RESPIRATORY CHAMBER. Kumahara, H 1; Yoshioka, M 2; Ishii, K 1; Shindo, M 2; Schutz, Y 3; Tanaka, H 2 (2001). Medicine & Science in Sports & Exercise. 33(5) Supplement 1:S251.
Study looked at accuracy and reliability in 13 healthy subjects using a respiratory chamber and that found that the Lifecorder slightly underestimates Total Energy Expenditure (92+/- 6% of the chamber value) „However, it could well assess energy expenditure not only during exercise but also during non-structured activity. These data suggested that the accelerometer method was a useful assessment of daily physical activity in real life, provided individual calibration factors are developed.”
Validity of four motion sensors in measuring moderate intensity physical activity. Basset, David R. Jr., Barbara E. Ainsworth, Ann M. Swartz, Scott J. Strath, William L. O’Brien, George A. King (2000). Medicine & Science in Sport & Exercise, 32(9), Supplement S471-S480.
This study tested the validity of 4 motion sensors with 81 participants (age 19-74) for measuring energy expenditure (EE) during moderate intensity physical activities (yardwork, housework,occupation, family care, conditioning and recreation) in field and laboratory settings. The mean error scores (indirect calorimetric minus device) across all activities were Lifecorder, 0.96MET; Computer Science and Applications 0.97 MET; 0.47 MEt; 0.05 MET; Caltrac, 0.83 MET; Yamax SW701 1.12 MET) the authors concluded that „motion sensors tended to over predict EE during walking. However they under predicted the energy cost of many activities because of the inability to detect arm movements and external work. These finding illustrate some of the limitations of using motion sensors to predict EE in field settings.”
Accuracy of Calorie Counter method to assess daily energy expenditure and physical activities in athletes and nonathletes. Suzuki I, Kawakami N,Shimizu H. (1997). J Sports Med Phys Fitness. 1997 Jun;37(2):131-6.
Assess Lifecorder mechanism (Calorie counter) in 107 non athletic subjects (13-73 years and 38 athletic males. Showed that the Lifecorder ” may be reliable enough for assessing the energy expenditure in athletes as well as nonetheless during free-living conditions.”
Validity of daily energy expenditure estimated by calorie counter combined with accelerometer. S.Yamada, Y Baba (1990). J.UOEH,12 (1);77-82.
To estimate a reasonable and convenient method for the assessment of daily energy expenditure in workers, the validity of a calorie counter combined with an accelerometer (Kenz Calorie Counter) was tested during treadmill exercise. Ten male and female students each volunteered for exercise on a treadmill at different running speeds: 9 speeds at 2 to 10 km/h each for male subjects: 8 speeds at 2 to 9 km/h each for female subjects. Energy expenditure measured with respiratory gas analysis was compared with that estimated by the calorie counter outfitted on the waist of the subjects. For running speed slower than 9 km/h, the work intensity reading on the calorie counter increased in direct proportion to the speed of the treadmill. The correlation between running speed and the work intensity reading of the calorie counter was linear up to 8 km/h(y = 0.95 x -0.2, r = 0.96, P less than 0.001). A linear relationship during treadmill exercise (at a speed of less than 9 km/h) was also established between energy consumption measured by respiratory gas analysis and that estimated from the calorie counter (y = 1.00 x + 11.7, r = 0.94, P less than 0.001). Thus, we validated the usefulness of the calorie counter for the assessment of energy expenditure during daily physical activities.