Exercise-induced hyperthermia as a possible mechanism for tendon degeneration

Abstract

Mathematical modelling of tendon thermodynamics predicted that the temperature of the central core of the equine superficial digital flexor tendon would plateau at 11°C above the tendon surface temperature during a sustained gallop. A mean temperature differential (between tendon core and surface) of 5.4 (S.E. ± 1.0)°C was demonstrated in vivo in four horses. Peak intra-tendinous temperatures in the range 43–45°C were recorded. Temperatures above 42.5°C are known to result in fibroblast death in vitro [Hall (1988) Radiobiology for the Radiologist, 3rd Edn., pp. 294–329]. These in vivo recrodings provide a possible aetiology for the degenerative changes that are observed in the central core of tendons in both equine and human athletes.