Isokinetic Quadriceps and Hamstring Muscle Strength Values in K League 1 Professional Soccer Playersopen access
- Authors
- Song, Mun-Ku
- Issue Date
- Dec-2021
- Publisher
- Korea Institute of Sport Science
- Keywords
- Isokinetic muscle strength; K League 1; Knee strength; Professional soccer players; Quadriceps and hamstring
- Citation
- Korean Journal of Sport Science, v.32, no.4, pp 472 - 480
- Pages
- 9
- Indexed
- SCOPUS
KCI
- Journal Title
- Korean Journal of Sport Science
- Volume
- 32
- Number
- 4
- Start Page
- 472
- End Page
- 480
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/108711
- DOI
- 10.24985/kjss.2021.32.4.472
- ISSN
- 1598-2920
2233-7938
- Abstract
- PURPOSE This study aimed to present isokinetic quadriceps and hamstring muscle strength values in K league 1 (K1) professional soccer players and compare these results to those of published studies. METHODS A total of 31 K1 soccer players (age 24.5±4.2) without a history of lower limb injury were included in this study. Isokinetic knee strength tests were implemented at a velocity of 60°·s-1 and 180°·s-1 for both dominant (D) and non-dominant (ND) legs using a dynamometer. Strength variables included peak torque (PT), body mass normalized PT (NPT), bilateral strength difference (BD), and hamstring to quadriceps strength (H/Q) ratio. RESULTS At 60°·s-1 velocity, the NPTs of the quadriceps were 3.39N·m·kg-1 and 3.33N·m·kg-1 for D and ND legs, respectively, and those of the hamstrings were 2.00N·m·kg-1 and 1.89N·m·kg-1 for D and ND legs, respectively. At 180°·s-1 velocity, the NPTs of the quadriceps were 2.31N·m·kg-1, 2.27N·m·kg-1 for D and ND legs, respectively, and those of the hamstrings were 1.42N·m·kg-1, 1.39N·m·kg-1 for D and ND legs, respectively. At all velocities, the BDs of quadriceps and hamstring muscles ranged from 6.6–7.8%, and H/Qs ranged from 57–62%. Compared to previous studies that did not consider the history of injury, this study showed lower levels of BD (less than 10%) and higher levels of NPT. CONCLUSIONS The presented isokinetic quadriceps and hamstring muscle strength values can be used as reference values for the isokinetic knee strength of K1 professional soccer players. © Korea Institute of Sport Science.
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