Evaluation and comparison of electromyographic activity in bench press with feet on the ground and active hip flexion

• DOI: 10.1371/journal.pone.0218209
• Publication Date: 2019-06-14T17:38:24Z
• Authors: José M. Muyor; David Rodríguez-R...; Isabel Martín-Fue...; José A. Antequera...
• Keywords: Adult; Male; Hip; Electromyography; Foot; Science; Q; R; Rectus Abdominis; Biomechanical Phenomena; Forearm; Young Adult; 03 medical and health sciences; 0302 clinical medicine; Medicine; Humans; Female; Knee; Muscle Strength; Muscle, Skeletal; Research Article; Abdominal Muscles

The present study aimed to evaluate and compare the levels of electromyographic activation in the pectoralis major, anterior deltoid, triceps brachii, forearm, rectus abdominis, external oblique, and rectus femoris muscles during a horizontal bench press in two situations: 1) with the feet on the ground; and 2) with active hip flexion and 90° of knee flexion. Twenty young men were familiarized with the procedure and the calculation of one-rep max (1RM). In a second session, electromyographic activity values were recorded in both bench press situations (with the feet on the ground vs active hip flexion and knees at 90°) at 60% 1RM. Performing the bench press with the hips and knees flexed produced significantly greater muscle activation of all elevated muscles (p < 0.01; d > 0.5). The pectoralis major showed the greatest activation, followed by the anterior deltoid and the triceps brachii. In addition, the greater activation of the abdominal muscles occurs due to the need to stabilize the core while performing the bench press with hip and knee flexion as well as the lumbar spine due to traction of the hip flexors.