Infrared Thermographic Assessment of Exercise-Induced Changes in Local Surface Temperature in Horses Following Treadmill Training: Preliminary Findings.

Overview

• This study investigated the use of infrared thermography to detect changes in surface temperature of horses after treadmill exercise.
• The research demonstrated that exercise significantly increased local surface temperatures in specific muscle regions, indicating thermography’s potential as a non-invasive monitoring tool for training adaptations in horses.

Background and Purpose

• Physical exercise leads to physiological changes such as increased muscle activity and heat production.
• These changes affect the body’s surface temperature due to increased blood flow and metabolic heat release.
• Infrared thermography is a non-invasive imaging technique that detects heat emitted from the body’s surface, allowing visualization and quantification of temperature changes.
• The study aimed to evaluate whether infrared thermography could reliably detect exercise-induced changes in local surface temperature in horses and to observe changes in temperature distribution patterns after treadmill training.

Methods

• Subjects: Three clinically healthy Warmblood horses participated in the study.
• Training sessions: Horses underwent 10 consecutive treadmill training sessions to ensure consistent exercise stimulus.
• Thermographic imaging: Infrared images were taken immediately before exercise (T1) and immediately after exercise (T2).
• Regions of interest: Two anatomical areas were assessed:
  • Bx1 – the deltoid muscle area located in the forelimb region.
  • El1 – the gluteal muscle area located in the hindlimb region.
• Data analysis: Mean local surface temperature measurements from each region were statistically analyzed using linear mixed-effects models to assess changes before and after exercise.
• Qualitative assessment: Thermographic images were visually evaluated for changes in the spatial distribution of temperature, looking for patterns such as areas of increased heat intensity.

Results

• Quantitative findings:
  • In the Bx1 (deltoid) region:
    • Mean temperature increased significantly from 33.75 °C before exercise to 35.36 °C after exercise.
    • Statistical significance was high (F = 968.32, p < 0.001).
  • In the El1 (gluteal) region:
    • Mean temperature rose significantly from 32.37 °C before to 33.33 °C after exercise.
    • This increase was also statistically significant (F = 296.31, p < 0.001).
• Qualitative observations:
  • Thermographic images showed a larger area of higher temperature post-exercise in both muscle regions.
  • These high-temperature zones indicate enhanced blood flow and muscular activity resulting from exercise.

Conclusions and Implications

• Infrared thermography effectively detects local surface temperature elevations caused by exercise in horses.
• The observed temperature increases in deltoid and gluteal muscles correspond to physiological responses like increased muscle work and metabolic heat generation during exercise.
• Changes in thermal distribution patterns post-exercise indicate that thermography can visually map muscle activity and regional warming.
• This technique offers a non-invasive way to monitor training adaptations and muscle function over time in equine athletes.
• Though preliminary and limited by small sample size, the findings support further investigation of thermography as a practical monitoring tool in veterinary sports medicine.