Reliability of cardiorespiratory measurements with a new ergospirometer during intense treadmill exercise in Thoroughbred horses.
Authors: Curtis R A, Kusano K, Evans D L, Lovell N H, Hodgson D R
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary The Quadflow ergospirometer represents a significant development for equine exercise physiology, enabling non-invasive measurement of oxygen uptake and ventilatory parameters during high-intensity treadmill work. Curtis and colleagues assessed the device's reliability across multiple measurements, finding oxygen uptake determinations accurate to within 8.2% on average (range 2.1–12.5%), whilst peak expiratory flow and minute ventilation showed even tighter measurement variability of 6.1–9.4% and 2.5–7.4% respectively. Within-test coefficients of variation proved excellent for ventilatory variables (<5%) and acceptable for oxygen uptake (7.7%), though the apparatus did trigger modest increases in blood lactate and heart rate during submaximal exercise compared to open flow masks, suggesting mild respiratory resistance. These performance characteristics position the Quadflow as a reliable tool for routine clinical assessment and research applications, provided practitioners account for its minor physiological effects when interpreting results. The acceptable reliability statistics warrant adoption in veterinary practice and research settings where detailed cardiorespiratory profiling informs training management, fitness assessment, and investigation of performance-limiting conditions.
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Practical Takeaways
- •The Quadflow ergospirometer demonstrates acceptable reliability for routine clinical exercise testing in equine veterinary practice and research, with measurement errors within clinically acceptable ranges
- •The device causes minimal physiological interference during submaximal exercise, though practitioners should note small increases in lactate and heart rate when interpreting results
- •This equipment can be confidently used for standardized cardiorespiratory assessment in horses during treadmill exercise testing protocols
Key Findings
- •Mean percentage error for oxygen uptake measurements was 8.2% (range 2.1-12.5%), indicating acceptable reliability for the Quadflow ergospirometer
- •Peak expiratory flow rate error ranged from 6.1-9.4% and minute ventilation error from 2.5-7.4%
- •Coefficients of variation were <5% for pulmonary ventilation variables and 7.7% for oxygen uptake during continuous exercise at 9.0 m/s
- •Quadflow mask caused small increases in blood lactate concentration and relative heart rate during submaximal exercise compared to open flow mask