Physiological comparison of conditioned and non-conditioned university horses following semester break.
Authors: Stellmack J M, Logan A A, Higgins A H, Hoffman R M
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: Conditioning Status and Return to Work Whether horses maintain ridden work during extended breaks significantly influences their muscular development but may have limited impact on aerobic fitness when pasture access is available. Researchers assigned 12 mature stock-type horses to either a conditioned group (light-to-moderate riding maintained) or non-conditioned group (no formal exercise) over a 12-week semester break, with all horses having access to 1.5–2.5 hectares of pasture for 12–24 hours daily, then monitored both groups over four weeks of standardised light-to-moderate exercise using resting and peak heart rate measurements alongside body condition scoring and muscular circumference assessments at days 0, 14, and 28. Conditioned horses demonstrated superior topline muscling scores (P = 0.02) and maintained better muscular definition, whilst non-conditioned horses paradoxically showed larger gaskin circumference and tended towards greater body weight (551.4 kg vs 491.4 kg, P = 0.07)—likely reflecting compensatory muscle changes rather than true fitness. Cardiovascular parameters (peak and resting heart rates) showed no significant differences between groups, with both increasing similarly throughout the reconditioning period (P = 0.04), suggesting that pasture turnout may preserve baseline aerobic conditioning despite cessation of ridden work. For practitioners, this implies that horses on extended pasture turnout without structured exercise may not experience dramatic fitness losses, yet maintaining light work during breaks preserves functional muscular architecture—an important distinction when planning rehabilitation timelines and managing seasonal training schedules.
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Practical Takeaways
- •Horses maintained on pasture without formal riding maintain fitness better than expected, suggesting that turning out on adequate acreage during breaks is valuable for fitness maintenance
- •Muscling loss occurs rapidly with cessation of ridden work even with pasture access, so targeted conditioning should resume promptly following breaks to restore topline development
- •Non-conditioned horses appear to redistribute weight toward hindquarters (larger gaskin) rather than losing overall condition, suggesting pasture exercise patterns differ from ridden work
Key Findings
- •Conditioned horses maintained significantly greater topline muscling compared to non-conditioned horses (P = 0.02)
- •Non-conditioned horses had larger gaskin circumference despite lighter average body weight (551.4 vs 491.4 kg; P = 0.04)
- •Peak and resting heart rates were not significantly different between groups, but both groups showed increased heart rates throughout the 28-day study (P = 0.04)
- •Pasture access (1.5-2.5 hectares for 12-24 hours/day) may have been sufficient to maintain cardiovascular fitness during the 12-week unridden period