Effects of eccentric-only resistance training and detraining

Area of Science:

• Exercise Physiology
• Muscle Adaptation
• Sports Science

Background:

• Investigating the specific adaptations to unilateral eccentric-only resistance training is crucial for understanding muscle plasticity.
• This study examines the effects of eccentric-only dynamic constant external resistance (DCER) training on leg extensor muscles.

Observation:

• Eccentric-only DCER training was performed on the nondominant limb for eight weeks.
• Subjects were tested pre-training, post-training, and after an eight-week detraining period.
• Measurements included eccentric DCER strength and concentric isokinetic leg extension peak torque across various velocities.

Findings:

• Eccentric-only training significantly increased eccentric DCER strength in both the trained (29%) and untrained (17%) limbs.
• No significant changes were observed in concentric isokinetic peak torque at any velocity in either limb.
• The observed increases in eccentric strength were retained throughout the eight-week detraining phase.

Implications:

• Unilateral eccentric training can induce cross-limb strength adaptations.
• Eccentric training may be a valuable strategy for improving muscle strength and maintaining gains.
• Further research could explore the mechanisms behind these cross-limb effects and optimal training protocols.