Effects of phosphatidic acid supplementation on muscle thickness and strength in resistance-trained men.

The purpose of this study was to investigate the effects of phosphatidic acid (PA) supplementation on muscle thickness and strength following an 8 week supervised resistance-training program. Fifteen resistance trained men (22.8 ± 3.

Muscle activation during resistance exercise at 70% and 90% 1-repetition maximum in resistance-trained men.

Introduction: Muscle activation was investigated during resistance exercise with 2 relatively high-intensity loads.

Methods: Ten resistance-trained men performed the leg press exercise to repetition failure: a set at 70% of 1-repetition maximum (1RM) and a set at 90% of 1RM. Surface electromyography (EMG) was used to assess peak and mean muscle activation of the vastus lateralis, rectus femoris, and vastus medialis.