Lower-Body Muscle Structure and Jump Performance of Stronger and Weaker Surfing Athletes
| Autor: | Josh L. Secomb, Sophia Nimphius, Jeremy M. Sheppard, Tai T. Tran, Oliver R.L. Farley, Lina Lundgren |
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| Rok vydání: | 2016 |
| Předmět: |
Male
Vastus lateralis muscle Physical Therapy Sports Therapy and Rehabilitation Isometric exercise Athletic Performance 030204 cardiovascular system & hematology Stretch shortening cycle Young Adult 03 medical and health sciences Gastrocnemius muscle 0302 clinical medicine Isometric Contraction Humans Eccentric Orthopedics and Sports Medicine Muscle Strength Muscle Skeletal Simulation Ultrasonography Mathematics Orthodontics biology Athletes business.industry 030229 sport sciences biology.organism_classification Lower Extremity Exercise Test Jump business |
| Zdroj: | International Journal of Sports Physiology and Performance. 11:652-657 |
| ISSN: | 1555-0273 1555-0265 |
| DOI: | 10.1123/ijspp.2015-0481 |
| Popis: | Purpose:To identify whether there are any significant differences in the lower-body muscle structure and countermovement-jump (CMJ) and squat-jump (SJ) performance between stronger and weaker surfing athletes.Methods:Twenty elite male surfers had their lower-body muscle structure assessed with ultrasonography and completed a series of lower-body strength and jump tests including isometric midthigh pull (IMTP), CMJ, and SJ. Athletes were separated into stronger (n = 10) and weaker (n = 10) groups based on IMTP performance.Results:Large significant differences were identified between the groups for vastus lateralis (VL) thickness (P = .02, ES = 1.22) and lateral gastrocnemius (LG) pennation angle (P = .01, ES = 1.20), and a large nonsignificant difference was identified in LG thickness (P = .08, ES = 0.89). Furthermore, significant differences were present between the groups for peak force, relative peak force, and jump height in the CMJ and SJ (P < .01−.05, ES = 0.90−1.47) and eccentric peak velocity, as well as vertical displacement of the center of mass during the CMJ (P < .01, ES = 1.40−1.41).Conclusion:Stronger surfing athletes in this study had greater VL and LG thickness and LG pennation angle. These muscle structures may explain their better performance in the CMJ and SJ. A unique finding in this study was that the stronger group appeared to better use their strength and muscle structure for braking as they had significantly higher eccentric peak velocity and vertical displacement during the CMJ. This enhanced eccentric phase may have resulted in a greater production and subsequent utilization of stored elastic strain energy that led to the significantly better CMJ performance in the stronger group. |
| Databáze: | OpenAIRE |
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