• 1
    Hootman, J. M., Macera, C. A., Ainsworth, B. E., Addy, C. L., Martin, M., Blair, S. N.. (2002) Epidemiology of musculoskeletal injuries among sedentary and physically active adults. Med Sci Sports Exerc. 34: 838844.
  • 2
    Hagan, R. D., Upton, S. J., Wong, L., Whittam, J.. (1986) The effects of aerobic conditioning and/or caloric restriction in overweight men and women. Med Sci Sports Exerc. 18: 8794.
  • 3
    Hill, J. O., Peters, J. C.. (1998) Environmental contributions to the obesity epidemic. Science. 280: 13711374.
  • 4
    Jakicic, J. M., Winters, C., Lang, W., Wing, R. R.. (1999) Effects of intermittent exercise and use of home exercise equipment on adherence, weight loss, and fitness in overweight women: a randomized trial. JAMA. 282: 15541560.
  • 5
    Ralston, H. J.. (1958) Energy-speed relation and optimal speed during level walking. Int Z Angew Physiol. 17: 277283.
  • 6
    Margaria, R.. (1976) Biomechanics and Energetics of Muscular Exercise. Clarendon Press: Oxford.
  • 7
    DiPrampero, P. E.. (1986) The energy cost of human locomotion on land and water. Int J Sports Med. 7: 5572.
  • 8
    Zarrugh, M. Y., Todd, F. N., Ralston, H. J.. (1974) Optimization of energy expenditure during level walking. Eur J Appl Physiol Occup Physiol. 33: 293306.
  • 9
    Astrand, P. O., Rodahl, K.. (1977) Textbook of Work Physiology: Physiological Bases of Exercise 2nd ed. McGraw Hill: New York.
  • 10
    Inman, V. T., Ralston, H. J., Todd, B.. (1981) Human walking. In: Human Walking Williams and Wilkins: Baltimore, MD. 6277.
  • 11
    Martin, P. E., Rothstein, D. E., Larish, D. D.. (1992) Effects of age and physical activity status on the speed-aerobic demand relationship of walking. J Appl Physiol. 73: 200206.
  • 12
    Tolani, N. A., Kram, R.. (1999) Biomechanics of backward walking. International Society of Biomechanics Congress. International Society of Biomechanics: Calgary, Alberta, Canada. 254.
  • 13
    Bloom, W. L., Marshall, F. E.. (1967) The comparison of energy expenditure in the obese and lean. Metabolism. 16: 685692.
  • 14
    Freyschuss, U., Melcher, A.. (1978) Exercise energy expenditure in extreme obesity: influence of ergometry type and weight loss. Scand J Clin Lab Invest. 38: 753759.
  • 15
    Melanson, E. L., Bell, M. L., Knoll, J. R., et al (2003) Body mass index and sex influence the energy cost of walking at self-selected speeds. Med Sci Sports. 35(5 Suppl): S183
  • 16
    Ohrstrom, M., Hedenbro, J., Ekelund, M.. (2001) Energy expenditure during treadmill walking before and after vertical banded gastroplasty: a one-year follow-up study in 11 obese women. Eur J Surg. 167: 845850.
  • 17
    Mattsson, E., Larsson, U. E., Rossner, S.. (1997) Is walking for exercise too exhausting for obese women? Int J Obes Relat Metab Disord. 21: 380386.
  • 18
    Melanson, E. L., Sharp, T. A., Seagle, H. M., et al (2002) Effect of exercise intensity on 24-h energy expenditure and nutrient oxidation. J Appl Physiol. 92: 10451052.
  • 19
    Spyropoulos, P., Pisciotta, J. C., Pavlou, K. N., Cairns, M. A., Simon, S. R.. (1991) Biomechanical gait analysis in obese men. Arch Phys Med Rehabil. 72: 10651070.
  • 20
    Dempsey, J. A., Reddan, W., Balke, B., Rankin, J.. (1966) Work capacity determinants and physiologic cost of weight-supported work in obesity. J Appl Physiol. 21: 18151820.
  • 21
    Byrne, N. M., Hills, A. P.. (2002) Relationships between HR and V˙o2 in the obese. Med Sci Sports Exerc. 34: 14191427.
  • 22
    Franklin, B. H., Whaley, G. P., Howley, E. T.. (2002) ACSM's Guidelines for Exercise Testing and Prescription 6th ed. Lippincott Williams & Wilkins: Philadelphia, PA.
  • 23
    Borg, G. A., Linderholm, H.. (1967) Perceived exertion and pulse rate during graded exercise in various age groups. Acta Med Scand. 472(suppl): 194206.
  • 24
    Brockway, J. M.. (1987) Derivation of formulae used to calculate energy expenditure in man. Hum Nutr Clin Nutr. 41: 463471.
  • 25
    World Health Organization (1998) Obesity. Preventing and Managing the Global Epidemic. World Health Organization: Geneva, Switzerland.
  • 26
    Pandolf, K. B., Givoni, B., Goldman, R. F.. (1977) Predicting energy expenditure with loads while standing or walking very slowly. J Appl Physiol. 43: 577581.
  • 27
    Strydom, N. B., van Graan, C. H., Morrison, J. F., Viljoen, J. H., Heyns, A. J.. (1968) The influence of boot weight on the energy expenditure of men walking on a treadmill and climbing steps. Int Z Angew Physiol. 25: 191197.
  • 28
    Ralston, H. J., Lukin, L.. (1969) Energy levels of human body segments during level walking. Ergonomics. 12: 3946.
  • 29
    McGraw, B., McClenaghan, B. A., Williams, H. G., Dickerson, J., Ward, D. S.. (2000) Gait and postural stability in obese and nonobese prepubertal boys. Arch Phys Med Rehabil. 81: 484489.
  • 30
    Hoffman, M. D., Sheldahl, L. M., Buley, K. J., Sandford, P. R.. (1997) Physiological comparison of walking among bilateral above-knee amputee and able-bodied subjects, and a model to account for differences in metabolic cost. Arch Phys Med Rehabil. 78: 385392.
  • 31
    Donelan, J. M., Shipman, D. W., Kram, R., Kuo, A. D.. (2004) Mechanical and metabolic requirements for active lateral stabilization in human walking. J Biomech. 37: 827835.
  • 32
    Donelan, J. M., Kram, R., Kuo, A. D.. (2001) Mechanical and metabolic determinants of the preferred step width in human walking. Proc R Soc Lond B Biol Sci. 268: 19851992.
  • 33
    Shipman, D. W., Donelan, J. M., Kram, R., Kuo, A. D.. (2002) Metabolic cost of lateral leg swing in human walking. World Congress of Biomechanics. American Society of Biomechanics: Calgary, Alberta, Canada.
  • 34
    Heglund, N. C., Willems, P. A., Penta, M., Cavagna, G. A.. (1995) Energy-saving gait mechanics with head-supported loads. Nature. 375: 5254.
  • 35
    DeVita, P., Hortobagyi, T.. (2003) Obesity is not associated with increased knee joint torque and power during levesl walking. J Biomech. 36: 13551362.
  • 36
    Malatesta, D., Simar, D., Dauvilliers, Y., et al (2003) Energy cost of walking and gait instability in healthy 65 and 80 yr olds. J Appl Physiol. 95: 22482256.
  • 37
    Mills, P. M., Barrett, R. S.. (2001) Swing phase mechanics of healthy young and elderly men. Human Movement Sci. 20: 427446.
  • 38
    Nene, A., Bryne, C., Hermens, H.. (2004) Is rectus femoris really a part of quadriceps? Assessment of rectus femoris function during gait in able-bodied adults. Gait Posture. 20: 113.
  • 39
    Minetti, A. E., Boldrini, L., Brusamolin, L., Zamparo, P., McKee, T.. (2003) A feedback controlled treadmill (treadmill-on-demand) and the spontaneous speed of walking and running in humans. J Appl Physiol. 95: 838843.
  • 40
    Hughes, A. L., Goldman, R. F.. (1970) Energy cost of “hard work.”. J Appl Physiol. 29: 570572.
  • 41
    Pate, R. R., Pratt, S. N., Blair, S. N.. (1995) Physical activity and public health: a recommendation from the Centers for Disease Control and Prevention and the American College of Sports Medicine. JAMA. 273: 402407.
  • 42
    National Institutes of Health (1998) Clinical Guidelines on the Identification, Evaluation and Treatment of Overweight and Obesity in Adults. National Heart Lung and Blood Institute: Bethesda, MD.
  • 43
    Felson, D. T., Anderson, J. J., Naimark, A., Walker, A. M., Meenan, R. F.. (1988) Obesity and knee osteoarthritis: the Framingham study. Ann Intern Med. 109: 1824.
  • 44
    Lelas, J. L., Merriman, G. J., Riley, P. O., Kerrigan, D. C.. (2003) Predicting peak kinematic and kinetic parameters from gait speed. Gait Posture. 17: 106112.