Functional Performance, Maximal Strength, and Power Characteristics in Isometric and Dynamic Actions of Lower Extremities in Soccer Players
- 1 August 2009
- journal article
- Published by Ovid Technologies (Wolters Kluwer Health) in Journal of Strength and Conditioning Research
- Vol. 23 (5), 1391-1401
- https://doi.org/10.1519/jsc.0b013e3181a4e88e
Abstract
The purposes of the present study were to determine muscle strength and power output characteristics in a group of professional soccer players and to identify their relationships with 2 functional performance tests (vertical jumping height and 15-m sprint time). Maximal strength and power indices attained against different loads in barbell back squat exercise, isometric maximal force of the knee extensor and plantar flexor muscles, isokinetic peak torque of the knee extensors muscles, vertical jumping height in squat and counter-movement jumps, and 15-m sprint time tests were assessed in 21 semiprofessional soccer players (age 20 +/- 3.8 years). Correlation analyses were performed to examine the relationship between each of these measures. The main results of the present study were that (a) maximal power in concentric half-squat exercise was attained with a load of 60% of 1 repetition maximum, representing 112% of body weight; (b) the performance in the functional tests selected was significantly related with all the half-squat variables measured, especially with loads of 75-125% of body weight; and (c) low to nonsignificant correlations were found between functional tests performance and isometric and isokinetic muscle strength measures. It was concluded that in semiprofessional soccer players (a) isometric and isokinetic muscle strength assessed in an open kinetic chain were not movement-specific enough to predict performance during a more complex movement, such as jump or sprint and (b) concentric half-squat exercise was principally related with the functional tests selected when it was performed against external loading within the range of the load in case of which the maximal power output was attained.Keywords
This publication has 29 references indexed in Scilit:
- Optimal Loading for Maximal Power Output during Lower-Body Resistance ExercisesMedicine & Science in Sports & Exercise, 2007
- Fast Unilateral Isometric Knee Extension Torque Development and Bilateral Jump HeightMedicine & Science in Sports & Exercise, 2006
- Field and laboratory testing in young elite soccer playersBritish Journal of Sports Medicine, 2004
- Physical Fitness, Injuries, and Team Performance in SoccerMedicine & Science in Sports & Exercise, 2004
- Strength training effects on physical performance and serum hormones in young soccer playersEuropean Journal of Applied Physiology, 2003
- Isokinetic Strength and Anaerobic Power of Elite, Subelite and Amateur French Soccer PlayersInternational Journal of Sports Medicine, 2001
- Human skeletal muscle fibres: molecular and functional diversityProgress in Biophysics and Molecular Biology, 2000
- Reliability of leg muscle electromyography in vertical jumpingEuropean Journal of Applied Physiology, 1999
- Modelling the relationship between isokinetic muscle strength and sprint running performanceJournal of Sports Sciences, 1998
- Relationship of Knee Extensor Strength and Hopping Test Performance in the Assessment of Lower Extremity FunctionJournal of Orthopaedic & Sports Physical Therapy, 1995