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Maximal aerobic capacity (VO2max) in horses: a retrospective study to identify the age-related decline

  • Allison Walker (a1), Shawn M Arent (a2) and Kenneth H McKeever (a1)
Abstract

Previous studies of the effect of age on maximal aerobic capacity (maximal rate of oxygen consumption, VO2max) in horses have only grouped horses (young, middle-aged and old) for statistical analysis. Those experiments were not designed to determine a break point due to age. The purpose of this study was to utilize data collected over the last 15 years to test the nature of the association between age and VO2max, and secondarily, to determine whether there is a ‘breakpoint’ in the age-related decline in aerobic capacity. Data were acquired from 50 unfit Standardbred mares ranging in age from 4 to 29 years, and were used in a retrospective regression analysis in order to characterize the age-related decline in VO2max. All VO2max values were measured using the same incremental graded exercise test protocol. The data were analyzed using a curvilinear regression analysis predicting VO2max from age, and the break point was determined using univariate simple contrasts. There was a significant decline in VO2max with age (R2 = 0.554; P < 0.001). The data analysis demonstrated a notable downturn in cardiopulmonary function between the ages of 18 and 20 years (P < 0.001). Such results indicate similar responses to age between humans and horses. These results have implications for improving training methods in active older horses.

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Corresponding author
*Corresponding author: mckeever@aesop.rutgers.edu
References
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1Poole, DC (2003). Current concepts of oxygen transport during exercise. Equine and Comparative Exercise Physiology 1: 522.
2Poole, DC and Erikson, HH (2007). Cardiovascular function and oxygen transport: responses to exercise and training. In: Hinchcliff, KW, Geor, RJ and Kaneps, AJ (eds) Equine Exercise Physiology: The Science of Exercise in the Athletic Horse, 1st edn. Edinburgh, UK: Saunders Ltd, pp. 212227.
3Marlin, D and Nankervis, KJ (2002). The respiratory system. Equine Exercise Physiology. New York: Wiley-Blackwell, pp. 4253.
4McKeever, KH and Hinchcliff, KW (1995). Neuroendocrine control of blood volume, blood pressure, and cardiovascular function in horses. Equine Veterinary Journal Supplement 18: 7781.
5McKeever, KH and Malinowski, K (1997). Exercise capacity in young and old mares. American Journal of Veterinary Research 58: 14681472.
6Betros, CL, McKeever, KH, Kearns, CF and Malinowksi, K (2002). Effects of aging and training on maximal heart rate and VO2max. Equine Exercise Physiology 34: 100105.
7McKeever, KH (2003). Aging and how it affects the physiological response to exercise in the horse. Clinical Techniques in Equine Practice 2: 258265.
8McKeever, KH and Malinowski, K (1999). Endocrine response to exercise in young and old horses. Equine Exercise Physiology 30: 561566.
9Holloszy, JO and Kohrt, WM (1995). Exercise. In: Masoro, EJ (ed.) Handbook of Physiology, Section 11, Aging, Chapter 24. New York: Oxford University Press, pp. 633666.
10Lakatta, EG (1995). Cardiovascular system. In: Masoro, EJ (ed.) Handbook of Physiology, Section 11, Aging, Chapter 17. New York: Oxford University Press, pp. 413474.
11Kenney, WL (1995). Body fluid and temperature regulation as a function of age. In: Lamb, DR, Gisolfi, CV and Nadel, E (eds) Perspectives in Exercise and Sports Medicine. Exercise in Older Adults, vol. 8. Carmel, IN: Cooper Publishing, pp. 305351.
12Dempsey, JA and Seals, DR (1995). Aging, exercise, and cardiopulmonary function. In: Lamb, DR, Gisolfi, CV and Nadel, E (eds) Perspectives in Exercise and Sports Medicine. Exercise in Older Adults, vol. 8. Carmel, IN: Cooper Publishing, pp. 237304.
13Stamford, BA (1988). Exercise and the elderly. In: Pandolf, KB (ed.) Exercise and Sport Science Reviews, vol. 16. New York: MacMillan Publishing Company, pp. 341380.
14Pollock, ML, Foster, C, Knapp, D, Rod, JL and Schmidt, DH (1987). Effect of age and training on aerobic capacity and body composition of master athletes. Journal of Applied Physiology 62: 725731.
15Raven, PB and Mitchell, JH (1980). Effect of aging on the cardiovascular response to dynamic and static exercise. In: Westfeldt, ML (ed.) The Aging Heart: It's Function and Response to Stress. New York: Raven Press, pp. 269296.
16Seals, DR, Hagberg, JM, Hurley, BF, Ehsani, AA and Holloszy, JO (1984). Endurance training in older men and women: I. Cardiovascular responses to exercise. Journal of Applied Physiology 57: 10241029.
17Cooper, KH, Purdy, JG, White, SR, Pollock, ML and Linnerud, AC (1977). Age-fitness adjusted maximal heart rates. In: Brunner, D and Jokl, E (eds) Medicine and Sport: The Role of Exercise in Internal Medicine. Basel, Switzerland: Karger, vol. 10, pp. 7888.
18Sheffield, LT, Malouf, JA, Sawyer, JA and Roitman, D (1978). Maximal heart rate and treadmill performance of healthy women in relation to age. Circulation 57: 7984.
19Londeree, BR and Moeschberger, ML (1984). Influence of age and other factors on maximal heart rate. Journal of Cardiac Rehabilitation 4: 4449.
20Johnson, RA (2005). Statistics: Principles and Methods. 5th edn. Madison, WI: John Wiley & Sons, pp. 115255.
21Donner, A and Cunningham, DA (1984). Regression analysis in physiological research: some comments on the problem of repeated measurements. Medicine and Science in Sport and Exercise 16: 422425.
22Scott, AJ and Holt, D (1982). The effect of two-stage sampling on ordinary least squares methods. Journal of the American Statistical Association 77: 848854.
23Lehnhard, RA, McKeever, KH, Kearns, CF and Beekley, MD (2004). Myosin heavy chain profiles and body composition are different in old versus young Standardbred mares. The Veterinary Journal 167: 5966.
24Vincent, TL, Newton, JR, Deaton, CM, Franklin, SH, Biddick, T, McKeever, KH, et al. , (2006). Retrospective study of predictive variables for maximal heart rate (HRmax) in horses undergoing strenuous treadmill exercise. Equine Veterinary Journal Supplement 36: 146152.
25Hintz, HF (1995). Nutrition of the geriatric horse. In: Proceedings Cornell Nutrition Conference. Cornell University: Ithaca, NY, pp. 195198.
26Fell, J and Williams, AD (2008). The effect of aging on skeletal-muscle recovery from exercise: possible implications for aging athletes. Journal of Aging and Physical Activity 16: 97115.
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Comparative Exercise Physiology
  • ISSN: 1755-2540
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