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Method for quantifying net anaerobic power in exercising horses.

H Ohmura¹, A Hiraga, J H Jones

¹Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA 95616, USA.

Equine Veterinary Journal. Supplement

|April 4, 2007

Summary

This study developed a new method to measure anaerobic power in horses. Breathing hyperoxic gas increased aerobic capacity and decreased lactate accumulation, aiding metabolic power assessment.

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Area of Science:

Equine Exercise Physiology
Sports Science
Animal Metabolism

Background:

Accurate measurement of net anaerobic power in exercising horses is lacking.
This limits precise estimation of total metabolic power during intense exercise.

Purpose of the Study:

To test if breathing hyperoxic (HO) gas increases VO2max proportionally to the decrease in plasma lactate accumulation rate (Mlactate).
To establish a method for estimating net anaerobic power and total metabolic power in horses.

Main Methods:

Six Thoroughbred horses exercised on a treadmill with a specialized mask for VO2 measurement.
Inspired oxygen concentration was controlled (HO, normoxic, hypoxic).
Jugular venous blood was sampled to determine Mlactate during VO2max tests.

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Main Results:

VO2max/kg body weight increased significantly with HO gas compared to normoxic conditions.
Plasma Mlactate accumulation rate decreased as VO2max increased.
Hypoxic data showed high variability, limiting its use in direct comparison.

Conclusions:

The ratio of Mlactate change to VO2max change provides an estimate of net anaerobic power.
This method offers a more accurate evaluation of total metabolic power in exercising horses.
Variability in VO2max necessitates careful interpretation of data from repeated runs.