What makes long-term resistance-trained individuals so strong? A comparison of skeletal muscle morphology, architecture, and joint mechanics.

In contrast, we found a clear difference for 3 of 4 of the individual muscles (VM, VL, and RF), a tendency for a difference in the fourth (VI), and over the whole muscle group QF L showed a highly significant difference with a large effect size (+11%, P < 0.01 ES 1.2).

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