Shoulder Muscle Activation Levels During Exercises With Axial and Rotational Load on Stable and Unstable Surfaces.
| Autor: | Santos Nascimento, Vinícius Yan, Barbosa Torres, Rafaela Joyce, Barros Beltrão, Natália, Soares dos Santos, Priscila, Torres Pirauá, André Luiz, Alves de Oliveira, Valéria Mayaly, Rodarti Pitangui, Ana Carolina, Cappato de Araújo, Rodrigo |
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| Předmět: |
ARM physiology
EXERCISE SHOULDER joint PECTORALIS muscle physiology TRICEPS physiology DELTOID muscle physiology BICEPS brachii SERRATUS anterior muscles ANTHROPOMETRY CLINICAL trials CROSSOVER trials ELECTROMYOGRAPHY EXERCISE physiology MUSCLE contraction PROBABILITY theory ROTATIONAL motion STATISTICS TRAPEZIUS muscle DATA analysis DATA analysis software DESCRIPTIVE statistics RESISTANCE training FRIEDMAN test (Statistics) PHYSIOLOGY |
| Zdroj: | Journal of Applied Biomechanics; Apr2017, Vol. 33 Issue 2, p118-123, 6p, 2 Black and White Photographs, 1 Chart, 2 Graphs |
| Abstrakt: | This study evaluated the effects of instability on the EMG activity of scapular stabilizing and upper limb muscles during exercises with axial and rotational load. Twenty male volunteers (20.9 ± 1.8 years, 174.1 ± 0.04 cm, 73.17 ± 8.77 kg) experienced in strength training participated in a crossover design. Muscle activation of anterior deltoid (AD), posterior deltoid (PD), pectoralis major (PM), biceps brachii (BB), triceps brachii (TB), upper trapezius (UT), middle trapezius (MT), lower trapezius (LT), and serratus anterior (SA) were determined on both conditions. Participants performed a single series of 10 repetitions of bench press and fly exercises on stable (bench) and unstable (proprioceptive disc) conditions at 60% of 1-RM. The Friedman test and post hoc Dunn's indicated that the unstable condition showed greater EMG activity for AD (P = .001) and BB (P = .002) on the fly exercise, SA (P = .001) and LT (P = .048) on the bench press, and PM (P < .002) on both exercises. These results show that using an unstable surface in exercises with rotational load provides superior EMG activity of the agonist muscles, while in exercise with axial load, the instability favors EMG activity of the scapular stabilizing muscles. [ABSTRACT FROM AUTHOR] |
| Databáze: | Complementary Index |
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