CONCENTRIC PHASE The concentric phase is when muscles shorten under tension — the flexion, or lifting, part of the movement. Think of picking the bar up during a deadlift, pulling during a row, or pressing overhead in a shoulder press. While important, focusing on speed during this phase isn’t necessarily the most crucial phase for growth. Slowing it down does increase fatigue and lactate build-up (which contributes to hypertrophy) but speeding it up can recruit more type II muscle fibres — those most associated with strength and size. muscle shortening under tension 10
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