Effects of a 20-Week High-Intensity Strength Training Program on Muscle Strength Gain and Cardiac Adaptation in Untrained Men: Preliminary Results of a Prospective Longitudinal Study.

In comparison, longitudinal research by Spence et al [ 14 , 56 ] analyzing cardiac adaptation in a small group of untrained young men undergoing either resistance or endurance training for 24 weeks showed a small trend toward biventricular eccentric remodeling in strength athletes.

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The kinetics of the 1-RM evaluations, presented in Table 4 , confirmed the efficiency of the strength-training program with highly significant improvements after 20 weeks compared to baseline (>40% for the 1-RM leg curl, >41.1% for the 1-RM bench press, >50.3% for the 1-RM pullover, >63.5% for the 1-RM butterfly, >80.1% for the 1-RM leg extension, >105% for the 1-RM curl biceps on desk, and >106% for the 1-RM inclined press).

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