Inter- and Intrasubject Similarity of Muscle Synergies During Bench Press With Slow and Fast Velocity

• Published in: Motor control Vol. 22; no. 1; p. 100
• Main Authors: Samani, Afshin, Kristiansen, Mathias
• Format: Journal Article
• Language: English
• Published: United States 01.01.2018
• Subjects: Adult; Blood Flow Velocity - physiology; Exercise Therapy - methods; Humans; Male; Muscle, Skeletal - physiology; Young Adult; movement velocity; neural control mechanism; strength training; tempo manipulation; time under tension; muscle coordination
• ISSN: 1087-1640
• DOI: 10.1123/mc.2016-0026

We investigated the effect of low and high bar velocity on inter- and intrasubject similarity of muscle synergies during bench press. A total of 13 trained male subjects underwent two exercise conditions: a slow- and a fast-velocity bench press. Surface electromyography was recorded from 13 muscles, and muscle synergies were extracted using a nonnegative matrix factorization algorithm. The intrasubject similarity across conditions and intersubject similarity within conditions were computed for muscle synergy vectors and activation coefficients. Two muscle synergies were sufficient to describe the dataset variability. For the second synergy activation coefficient, the intersubject similarity within the fast-velocity condition was greater than the intrasubject similarity of the activation coefficient across the conditions. An opposite pattern was observed for the first muscle synergy vector. We concluded that the activation coefficients are robust within conditions, indicating a robust temporal pattern of muscular activity across individuals, but the muscle synergy vector seemed to be individually assigned.