Endurance training predisposes the TA but not the EDL to muscle injury

• Published in: IEEE, PISCATAWAY, NJ, (USA). no. 097-1098. 1993 no. 97-1098
• Main Authors: Patel, T J, Lieber, R L, Ahsan, T, Friden, J
• Format: Conference Proceeding
• Language: English
• Published: 01.01.1993
• ISBN: 0780313771; 9780780313774

The effects of prior training were determined on muscle subjected to exercised-induced injury. Rabbit tibialis anterior (TA) and extensor digitorum longus (EDL) muscles were endurance-trained with low-frequency chronic stimulation for 30 minutes/day for 15 days. Cyclic eccentric contractions (EC) were then imposed on the muscle to induce damage. Three days following exercised-induced damage, contractile properties of the TA and EDL were determined. The data demonstrated a significant treatment effect in that TA and EDL oxidative capacity and endurance increased significantly. However, this increase in oxidative capacity did not reduce the effect of damage following EC-induced exercise. The maximum tetanic tension for control TA (1726 plus or minus 172g) was significantly greater than trained TA (1018 plus or minus 63g) (p less than or equal to 0.05). however, no significant difference existed between the EDL maximum tetanic tension (p>0. 6) for the control (2305 plus or minus 272g) and trained (2120 plus or minus 265g) groups. This suggests that oxidative capacity is not the sole preventer of skeletal muscle damage following eccentric damage.