Effects of TECAR Therapy on Body Surface Temperature and Longissimus Dorsi Muscle Tone in Thoroughbred Racehorses: A Pilot Study

Capacitive and resistive electric transfer (TECAR) therapy is increasingly used in equine physiotherapy; however, objective evidence regarding its immediate effects on equine back muscles remains limited. This pilot study aimed to evaluate the effects of TECAR therapy on body surface temperature and muscle tone of the longissimus dorsi muscle in Thoroughbred racehorses. A randomized, single-blinded experimental study was conducted in 20 clinically healthy Thoroughbred racehorses aged 2–3 years. Horses were randomly assigned to either a TECAR treatment group (n = 10) or a sham-treatment control group (n = 10). Thermographic imaging and palpation-based muscle tone assessment were performed before treatment, immediately after treatment, and 10 min post-treatment in the thoracolumbar region (Th15–L6). Differences between groups and changes over time were analyzed using repeated-measures ANOVA for temperature data and Friedman’s test with post hoc Wilcoxon signed-rank tests for palpation scores. TECAR therapy was associated with a significant increase in body surface temperature, with mean values rising from 25.3 ± 1.5 °C before treatment to 28.9 ± 1.3 °C immediately after treatment (p < 0.001) and remaining elevated after 10 min (27.6 ± 1.3 °C; p = 0.002). In contrast, only minor temperature changes were observed in the sham group. Palpation assessment demonstrated a significant reduction in muscle tone following TECAR therapy, with median scores decreasing from 3 [2–3] before treatment to 0 [0–1] immediately afterward (p < 0.001). These findings indicate that TECAR therapy induces an immediate thermal response, which persists for at least 10 min, and is associated with reduced longissimus dorsi muscle tone in racing horses. Further studies are warranted to investigate its clinical applications and long-term effects in equine rehabilitation.