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Arnold Schwarzenegger, who had arguably the best biceps peak in the history of bodybuilding, would frequently comment on how important it was to squeeze at the top to get a peak (concentric) contraction when training biceps. Squeezing the muscle concentrically is key to stimulating growth.
Compared with concentric contractions, eccentric contractions are potentially more effective because more weight can be lowered eccentrically than can be lifted concentrically.
On average, eccentric training produces greater gains in muscle mass compared with concentric training (10% versus 6.8%, respectively).
It must be acknowledged that one of the primary reasons eccentric work is more effective than concentric work is that greater loads can be used eccentrically, producing a more potent growth stimulus. With greater weight loads come greater potential risk of injury. That being said, emphasis should always be placed on good eccentric contractions during any exercise that is being performed. Any additional eccentric-specific work should be done prudently, with appropriate spotters and with a volume of work that is still within your ability to recover between training sessions.