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J Appl Physiol 81: 2244-2249, 1996;
8750-7587/96 $5.00
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Journal of Applied Physiology
Vol. 81, No. 5, pp. 2244-2249, November 1996
EXERCISE AND MUSCLE

Changes in maximum oxygen uptake during prolonged training, overtraining, and detraining in horses

Catherine M. Tyler, Lorraine C. Golland, David L. Evans, David R. Hodgson, and Reuben J. Rose

Department of Animal Health, Department of Animal Science, University of Sydney, Rural Veterinary Centre, Camden, New South Wales 2570, Australia

Received 11 December 1995; accepted in final form 10 July 1996.

Tyler, Catherine M., Lorraine C. Golland, David L. Evans, David R. Hodgson, and Reuben J. Rose. Changes in maximum oxygen uptake during prolonged training, overtraining, and detraining in horses. J. Appl. Physiol. 81(5): 2244-2249, 1996.---Thirteen standardbred horses were trained as follows: phase 1 (endurance training, 7 wk), phase 2 (high-intensity training, 9 wk), phase 3 (overload training, 18 wk), and phase 4 (detraining, 12 wk). In phase 3, the horses were divided into two groups: overload training (OLT) and control (C). The OLT group exercised at greater intensities, frequencies, and durations than group C. Overtraining occurred after 31 wk of training and was defined as a significant decrease in treadmill run time in response to a standardized exercise test. In the OLT group, there was a significant decrease in body weight (P < 0.05). From pretraining values of 117 ± 2 (SE) ml · kg-1 · min-1, maximal O2 uptake (VO2 max) increased by 15% at the end of phase 1, and when signs of overtraining were first seen in the OLT group, VO2 max was 29% higher (151 ± 2 ml · kg-1 · min-1 in both C and OLT groups) than pretraining values. There was no significant reduction in VO2 max until after 6 wk detraining when VO2 max was 137 ± 2 ml · kg-1 · min-1. By 12 wk detraining, mean VO2 max was 134 ± 2 ml · kg-1 · min-1, still 15% above pretraining values. When overtraining developed, VO2 max was not different between C and OLT groups, but maximal values for CO2 production (147 vs. 159 ml · kg-1 · min-1) and respiratory exchange ratio (1.04 vs. 1.11) were lower in the OLT group. Overtraining was not associated with a decrease in VO2 max and, after prolonged training, decreases in VO2 max occurred slowly during detraining.

time course; overload training

0161-7567/96 $5.00 Copyright © 1996 the American Physiological Society




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