Muscle Activation Pattern During Isometric Ab Wheel Rollout Exercise in Different Shoulder Angle-Positions

Abstract

OBJECTIVE:To investigate muscle activation of the shoulder extensors and trunk stabilizers by surface electromyography (sEMG) activity during the isometric Ab Wheel Rollout exercise in different shoulder joint positions. METHOD: We recruited 8 young, healthy, resistance trained men (age: 25 ± 3 years, height: 178 ± 5 cm, and total body mass: 81 ± 2 kg). All subjects performed two sets of 10 sec. maximal isometric contractions of the Ab Wheel Rollout exercise keeping the knees fixed on the floor and the arms taut. To perform the exercise, all subjects were randomly assessed in the following three positions related to the angle between the arms and trunk, in random order: arms aligned vertically with the Ab Wheel Rollout exercise (neutral); 90° and 150°. A rest period of 5 minutes was provided between tests. The sEMG signals were recorded in the following muscles: Latissimus Dorsi; Pectoralis Major; Erector Spinae; Rectus Abdominis. RESULTS: There were significant increases in Rectus Abdominis muscle activity between: neutral vs. 90°, neutral vs. 150° and 90° vs. 150°. There was a significant increase in Pectoralis Major muscle activity between neutral x 150°. CONCLUSIONS: The present findings indicate that (a) Ab Wheel Rollout exercise emphasizes the muscle action of the Pectoralis Major and Rectus Abdominis more than the Latissimus Dorsi and Erector Spinae; (b) the level of muscle activation depends on the external force created by the body mass and lever arm from the center of mass.

Analysis of co-contraction of the trunk muscles in the side bridge stabilization exercise with different unstable surfaces

“…Prior to data collection, subjects were asked to identify their preferred hand for writing, which was then considered their dominant arm. All subjects were right-hand dominant (MARCHETTI et al, 2015).…”

Efeito do treinamento resistido com diferentes cargas e posicionamentos de segmentos corporais na força, hipertrofia, potência e resistência muscular e sinal eletromiográfico em homens treinados

“…Esse é o primeiro estudo que compara diferentes posições da articulação do cotovelo na execução do pullover dumbbell. Outros estudos realizaram comparações entre diferentes exercícios: pullover com barra vs supino reto com barra (CAMPOS, SILVA, 2014), diferentes posições no Ab Wheel Rollout (MARCHETTI et al, 2015), pullover com barra vs dumbbell pullover (CAMPOS et al, 2017) e supino reto com barra, puxador alto costas, tríceps testa e pullover com barra (BORGES et al, 2018). Reconhecemos algumas limitações do presente estudo, como, tamanho da amostra, utilização de outras empunhaduras para a realização do exercício e, talvez, a forma de normalização do sinal eletromiográfico, uma vez que este procedimento ainda é motivo de grande divergência na literatura quando são analisados exercícios dinâmicos.…”