Effects of conditioning and maximal incremental exercise on oxygen consumption in sheep
1991
Mundie, T.G. | Januszkiewicz, A.J. | Rayburn, D.B. | Martin, D.G. | Ripple, G.R.
To assess the suitability of sheep for exercise studies, the effect of incremental exercise and conditioning on oxygen consumption was studied. Six sheep were adapted to a treadmill and subsequently trained 8 weeks. The sheep were then studied, in random order, using 3 incremental exercise protocols (EX-1, EX-2, and EX-3). The protocols were chosen to approximate high (EX-1), moderate (EX-2), and low (EX-3) intensity exercise by varying treadmill speed and incline. The sheep were then conditioned for an additional 12 weeks and retested on the EX-2 protocol. During exercise, oxygen consumption, gas exchange ratio (R), and rectal temperatures (Tb) were recorded. All 3 protocols resulted in significant increases in oxygen consumption, R, and Tb (P < 0.05). Maximum oxygen consumption for EX-1, 49.9 +/- 5.0 ml/min/kg of body weight, was significantly greater than maximum oxygen consumption for EX-2 and EX-3, 37.8 +/- 6.5 and 42.3 +/- 6.0 ml/min/kg, respectively (P < 0.05), whereas maximum R and maximum Tb were similar. After the additional 12-week conditioning, time on the treadmill increased 40% from 9.58 +/- 0.87 to 13.4 +/- 0.44 minutes, and maximum oxygen consumption increased 27% to 48.1 +/- 9.1 ml/min/kg. These data indicated that maximum oxygen consumption varied with intensity of the exercise, 12 weeks of maximal exercise conditioning was sufficient to produce a measurable training effect (ie, increase endurance and maximum oxygen consumption) and sheep are suitable for maximal exercise studies where oxygen consumption measurements are desired.
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