Effects of warm-up intensity on kinetics of oxygen consumption and carbon dioxide production during high-intensity exercise in horses.

The research article studies the impact of different intensity warm-up workouts on the oxygen consumption (VO2) and carbon dioxide production (VCO2) in moderately conditioned Standard-bred horses. The warm-up exercises were conducted in low and high intensity before the horses were put through intense exertion. The study concluded both warm-up techniques significantly increased the kinetics of VO2 and VCO2 while reducing the accumulated oxygen deficit during the high-intensity performance.

Research Methodology

• The subjects of the study were six adult standard-bred horses that were moderately conditioned.
• They were given varying levels of warm-up exercises and then run for 2 minutes at 115% of their maximum oxygen consumption rate (VO2max), and this was commenced 5 minutes after each separate session of warm-up.
• The warm-up sessions involved: no warm-up (NoWU), 10 minutes of exercise at 50% of VO2max (LoWU), and another session of warming up comprised of 7 minutes at 50% VO2max, followed by 45-second intervals at 80, 90, and 100% VO2max (HiWU).
• Oxygen consumption and VCO2were recorded during the exercise, after which kinetics of VO2 and VCO2 were calculated. The study also calculated the accumulated oxygen deficit.

Results

• The time constant for the rapid exponential increase in VO2 was found to be 30% lower for both levels of warm-up when compared with no warm-up scenario.
• Similarly, the rate of increase in VCO2 was 23% faster in both warm-up scenarios than when compared with no warm-up.
• Peak values for VO2 achieved during the high-speed test didn’t depict any significant difference across the trials.
• However, the accumulated oxygen deficit was significantly lower (lesser oxygen deficit) during both warm-up trials than in the no warm-up condition.

Conclusions

• The study concludes that both low- and high-intensity warm-ups, when conducted 5 minutes prior to the start of high-intensity exercise, dramatically accelerated VO2 and VCO2 kinetics and decreased the accumulated oxygen deficit during 2 minutes of intense exertion.
• This suggests that the warm-up exercises prepare the cardiorespiratory system of horses for a quicker and more effective response to subsequent high-intensity activities.