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The research aims to compare the effects of eccentric overload training and conventional resistance training on muscle morphology and mechanics.

December 8, 2025AJP Cell PhysiologyOpen Access

Eccentric overload training promotes serial sarcomerogenesis to a greater extent than conventional resistance training

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Eccentric overload training improves power and muscle mechanics in rats, suggesting superior benefits over conventional resistance training.

The research aims to compare the effects of eccentric overload training and conventional resistance training on muscle morphology and mechanics.
Nineteen Sprague-Dawley rats (10 trained with ECC OVERLOAD and 9 with CONV) participated.
Training involved 4 weeks of eccentric overload or conventional resistance exercises (3 times a week).
Muscle morphology and mechanics were assessed pre- and post-training.
Increased serial sarcomere number by 17% in soleus and 6% in gastrocnemius for ECC OVERLOAD group.
Peak plantar flexion torque increased by ~27% in ECC OVERLOAD and ~21% in CONV group.
Normalized torque improved by 26% in ECC OVERLOAD compared to 2.5% in CONV.

Hinks et al. (2025) studied this question.

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Eccentric overload training improves power and muscle mechanics in rats, suggesting superior benefits over conventional resistance training.