RT3 Research Information
Research is an integral part of developing a new product. Stayhealthy's
RT3 has come a long way from its humble beginnings as the Tritrac R3D.
Over the past decade the accelerator detection technology used in the
Tritrac R3D has been validated and tested against other methods for
tracking calories in humans. Some of this research has been used to improve
the algorithms used to calculate the calorie expenditure. The following is
a list of some of the peer reviewed studies on the Tritrac device. As the
use of the RT3 begins to replace the older Tritrac R3D look for research
studies on the RT3 in coming months.
Ainsworth, Barbara E.; Haskell, W. L.; Leon, A. S.; Jacobs, D. R.,
Jr.; Montoye, H. J.; Sallis, J. F.; Paffenbarger, R. S., Jr. (1993).
Compendium of physical activities: classification of energy costs of
human physical activities. Med Sci Sports Exerc, 25:71-80.
Chen, K.Y.; Sun, M. (1997). Improving energy expenditure
estimation by using a triaxial accelerometer. J Appl Physiol,
83(6):2112-22.
Coleman, K. J.; Epstein, L. H. (2001). Using the TriTrac to
improve self-reported activity in sedentary adult males. Accepted for
presentation at 48th annual conference for the American College of
Sports Medicine, May 30 - June 2, 2001. A published abstract in Med Sci
Sports Exerc, 33(Suppl.).
Coleman, Karen J.; Epstein, Leonard H. (1998). Application of
generalizability theory to measurement of activity in males who are not
regularly active: a preliminary report. Res Q Exerc Sport, 69:58-63.
Coleman, K. J.; Saelens, B. E.; Wiedrich-Smith, M. D.; Finn,
J. D.; Epstein, L. H. (1997). Relationships between TriTrac-R3D
vectors, heart rate and self-report in obese children. Med Sci Sports
Exerc, 29:1535-42.
Conn, Vicki S.; Minor, Marian A.; Mehr, David R.; Burks,
Kathryn J. (2000). Recording activity in older women with TriTrac. Am J
Health Behav, 24(5):370-8.
DeVoe, D.; Gotshall, R. (1998). Validity of the TriTrac-R3D
accelerometer during backpacking: A case study. Journal of Human
Movement Studies, 34(6):271-81.
Epstein, L. H.; Paluch, K. J.; Coleman, K. J.; Vito, D.;
Anderson, K. (1996). Determinants of physical activity in obese
children assessed by accelerometer and self-report. Med Sci Sports
Exerc, 28:1157-64.
Eston, R. G.; Rowlands, A. V.; Ingledew, D. K. (1998).
Validity of heart rate, pedometry and accelerometry for predicting the
energy cost of children’s activities. J Appl Physiol, 84:362-71.
Fehling, Patricia C.; Smith, Denise L.; Warner, Sarah E.;
Dalsky, Gail P. (1999). Comparison of accelerometers with oxygen
consumption in older adults during exercise. Med Sci Sports Exerc,
31:171-5.
Freedson, Patty S.; Miller, Kelly (2000). Objective monitoring
of physical activity using motion sensors and heart rate. Res Q Exerc
Sport, 71(2 Suppl):S21-9.
Fulton, J. E.; Masse, L. C.; Tortolero, S. R.; Watson, K. B.;
Heesch, K. C.; Kohl, H. W.; Blair, S. N.; Caspersen, C. J. (2001).
Field evaluation of energy expenditure from continuous and intermittent
walking in women. Med Sci Sports Exerc, 33(1):163-70.
Goldfield, G. S.; Kalakanis, L. E.; Ernst, M. M.; Epstein, L.
H. (2000). Open-loop feedback to increase physical activity in obese
children. Int J Obes Relat Metab Disord, 24(7):888-92.
Harro, Maarike (1997). Validation of a questionnaire to assess physical activity of children ages 4-8 years.
Res Q Exerc Sport, 68(4):259-68.
Harvey-Berino, Jean; Wellman, Andy; Hood, Virginia; Rourke,
Janine; Secker-Walker, Roger (2000). Preventing obesity in American
Indian children: When to begin. J Am Diet Assoc, 100(5):564-6.
Hendelman, D.; Miller, K.; Baggett, C.; Debold, E.; Freedson,
P. (2000). Validity of accelerometry for the assessment of moderate
intensity physical activity in the field. Med Sci Sports Exerc, 32(9
Suppl):S442-9.
Jakicic, John M.; Winters, C.; Lagally, Kristen; Ho, Joyce;
Robertson, Robert J.; Wing, Rena R. (1999). The accuracy of the
TriTrac-R3D accelerometer to estimate energy expenditure. Med Sci
Sports Exerc, 31(5):747-54.
Jakicic, John M.; Polley, Betsy A.; Wing, Rena R. (1998).
Accuracy of self-reported exercise and the relationship with weight
loss in overweight women. Med Sci Sports Exerc, 30(4):634-8.
Jakicic, John M.; Wing, R. R.; Butler, B. A.; Robertson, R. J.
(1995). Prescribing exercise in multiple short bouts versus one
continuous bout: effect on adherence, cardiorespiratory fitness, and
weight loss in overweight women. Int J Obes Relat Metab Disord,
19:893-901.
Janz, K. F.; Witt, J.; Mahoney, L. T. (1995). The stability of
children's physical activity as measured by accelerometry and
self-report. Med Sci Sports Exerc, 27:1326-32.
Johns, David P.; Ha, Amy S. (1999). Home and recess physical activity of Hong Kong children.
Res Q Exerc Sport, 70(3):319-23.
Kochersberger, G. A.; McConnell, E.; Kuchibhatla, M. N.;
Pieper, C. (1996). The reliability, validity, and stability of a
measure of physical activity in the elderly. Arch Phys Med Rehabil,
77:793-5.
Lappe, J. M.; Recker, R. R.; Weidenbusch, D. (1998). Influence
of activity level on patellar ultrasound transmission velocity in
children. Osteoporos Int, 8(1):39-46.
Lemmer, J.T.; Ivey, F.M.; Ryan, A.S.; Martel, G.F.; Hurlbut,
D.E.; Metter, J.E.; Fozard, J.L.; Fleg, J.L.; Hurley, B.F. (2001).
Effect of strength training on resting metabolic rate and physical
activity: age and gender comparisons. Med Sci Sports Exerc,
33(4):532-41.
Leenders, N.; Sherman, W.; Nagaraja, H. (2000). Comparisons of
four methods of estimating physical activity in adult women. Med Sci
Sports Exerc, 32(7):1320-6.
Louie, L.; Eston, R. G.; Rowlands, A. V.; Tong, K. K.;
Ingledew, D. K.; and Fu, F.H. (1999). Validity of heart rate, pedometry
and accelerometry for estimating the energy cost of activity in Hong
Kong Chinese boys. Pediatric Exercise Science, 11, 229-239.
Masse, L. C.; Fulton, J. E.; Watson, K. L.; Heesch, K. C.;
Kohl, H. W.; Blair, S. N.; Tortolero, S. R. (1999). Detecting bouts of
physical activity in a field setting. Res Q Exerc Sport, 70(3):212-9.
Matthews, Charles E.; Freedson, Patty S. (1996). Field trial
of a three-dimensinal activity monitor: comparison with self report.
Med Sci Sports Exerc. 27(7):1071-8.
McMurray, Robert G.; Harrell, Joanne S.; Bradley, Chyrise B.;
Webb, Julia P.; Goodman, Eric M. (1998). Comparison of a computerized
physical activity recall with a triaxial motion sensor in middle school
youth. Med Sci Sports Exerc, 30(8):1238-45.
Ng, Alexander V.; Kent-Braun, Jane A. (1997). Quantitation of
lower physical activity in persons with multiple sclerosis. Med Sci
Sports Exerc, 29(4):517-23.
Nichols, Jeanne F.; Morgan, Cindy G.; Chabot, Lauren E.;
Sallis, James F.; Calfas, Karen J. (2000). Assessment of physical
activity with the Computer Science and Applications, Inc.,
accelerometer: laboratory versus field validation. Res Q Exerc Sport,
71:36-43.
Nichols, J. F.; Morgan, C. G.; Sarkin, J. A.; Sallis, J. F.;
Calfas, K. J. (1999). Validity, reliability, and calibration of the
TriTrac accelerometer as a measure of physical activity. Med Sci Sports
Exerc, 31(6):908-12.
O'Mailia, S. P.; Williford, H. N.; FACSM; Olson, M. S.;
Baldwin, S.; Duey, B.; Crumpton, S.; Lavoie, A. M. (1998). Validity of
TriTrac-R3D and Caltrac: energy cost of popular aerobic exercise. Med
Sci Sports Exerc, 30(5):S13.
Rikli, Roberta E. (2000). Reliability, validity, and
methodological issues in assessing physical activity in older adults.
Res Q Exerc Sport, 71(2 Suppl):S89-96.
Rowlands, Ann V.; Eston, Roger G.; Ingledew, David K. (1999).
The relationship between activity levels, aerobic fitness, and body fat
in 8-10 year old children. J App Physiol, 86:1428-35.
Rowlands, A. V.; Eston, R. G.; Ingledew, D. K. (1997).
Measurement of physical activity in children with particular reference
to the use of heart rate and pedometry. Sports Med, 24, 258-272.
Saelens, Brian; Epstein, L. H.; O'Brian, J. G. (1995). The
TriTrac-R3D activity monitor and behavioral observation: a validity
study. Ann Behav Med, 17:S113 (Abstract).
Sallis, James F.; Saelens, Brian E. (2000). Assessment of
physical activity by self-report: status, limitations, and future
directions. Res Q Exerc Sport, 71(2 Suppl):S1-14.
Servais, Stephen B.; Webster, John G. (1984). Estimating human
energy expenditure using an accelerometer device. J Clin Eng,
9(2):159-171.
Sherman, W. M.; Morris, D. M.; Kirby, T. E.; Petosa, R. A.;
Smith, B. A.; Frid, D. J.; Leenders, N. (1998). Evaluation of a
commercial accelerometer (TriTrac-R3D) to measure energy expenditure
during ambulation. Int J Sports Med, 19:43-47.
Steele, Bonnie G.; Holt, Lyn; Belza, Basia; Ferris, Scott;
Lakshminaryan, S.; Buchner, David M. (2000). Quantitating physical
activity in COPD using a triaxial accelerometer. Chest, 117(5):1359-67.
Strand, Brad; Walswick, Paul; Sommer, Christa (2000). Tracking
children's caloric expenditure in physical education. J of Physical
Education, Recreation & Dance, 71(5):35.
Welk, G. J.; Blair, S. N.; Wood, K.; Jones, S.; Thompson, R.
W. (2000). A comparative evaluation of three accelerometry-based
physical activity monitors. Med Sci Sports Exerc, 32(9 Suppl):S489-97.
Welk, Gregory J.; Corbin, Charles B.; Dale, Darren (2000).
Measurement issues in the assessment of physical activity in children.
Res Q Exerc Sport 71(2 Suppl):S59-73.
Welk, Gregory J.; Corbin, Charles B.; Kampert, J. (1998). The
validity of the TriTrac-R3D activity monitor for the assessment of
physical activity in children: II. Temporal relationships among
objective assessments. Res Q Exerc Sport, 69:395-9.
Welk, Gregory J.; Corbin, Charles B. (1995). The validity of
the TriTrac-R3D activity monitor for the assessment of physical
activity in children. Res Q Exerc Sport, 66:202-9.
Westerterp K. R. (1999). Physical activity assessment with accelerometers. Int J Obes Relat Metab Disord, 23 Suppl 3:S45-9.
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RT3
Tri-axial Research Tracker Kit