ORIGINAL PAPER
Knee flexion and extension strength in young Brazilian soccer players: the effect of age and position
1
Physical Education Department, Estácio de Sá University, Rio de Janeiro, Brazil
2
Doctoral Program in Epidemiology in Public Health, ENSP/FioCruz, Rio de Janeiro, Brazil
3
Physical Education Graduate Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
4
São Paulo FIFA Medical Centre of Excellence, São Paulo, Brazil
5
Department of Physical Education and Sport Science, National and Kapodistrian University of Athens, Athens, Greece
Submission date: 2018-01-10
Acceptance date: 2018-03-14
Publication date: 2018-07-26
Hum Mov. 2018;19(3):23-29
KEYWORDS
TOPICS
ABSTRACT
Purpose:
To compare isokinetic knee flexors and extensors concentric muscle strength in young soccer players of different ages and playing positions.
Methods:
Seventy-seven young male soccer players were divided into 3 age categories: U-15, U-17, and U-20, with the consideration of 4 game positions: goalkeepers, defenders, midfielders, and forwards. The concentric tests of the hamstrings (Hcon) and quadriceps (Qcon) were performed at 30°/s, 60°/s, and 180°/s, and the ratio of 180°/30° was calculated.
Results:
The values of Qcon for the U-15 turned out significantly lower in comparison with the U-20 in 30°/s and 180°/s and in the 180°/30° ratio. The Hcon values for the U-15 were significantly lower than for the U-20 at 30°/s, 60°/s, 180°/s, as well as in the 180°/30° ratio. Strength levels were shown to be significantly different between the 3 analysed categories. The goalkeepers presented with Qcon and Hcon values significantly higher than the other playing positions, regardless of the angular velocity used.
Conclusions:
U-15, U-17, and U-20 athletes do not have the same level of strength. The goalkeepers demonstrated high strength values, suggesting the importance of specific training for each game position.
To compare isokinetic knee flexors and extensors concentric muscle strength in young soccer players of different ages and playing positions.
Methods:
Seventy-seven young male soccer players were divided into 3 age categories: U-15, U-17, and U-20, with the consideration of 4 game positions: goalkeepers, defenders, midfielders, and forwards. The concentric tests of the hamstrings (Hcon) and quadriceps (Qcon) were performed at 30°/s, 60°/s, and 180°/s, and the ratio of 180°/30° was calculated.
Results:
The values of Qcon for the U-15 turned out significantly lower in comparison with the U-20 in 30°/s and 180°/s and in the 180°/30° ratio. The Hcon values for the U-15 were significantly lower than for the U-20 at 30°/s, 60°/s, 180°/s, as well as in the 180°/30° ratio. Strength levels were shown to be significantly different between the 3 analysed categories. The goalkeepers presented with Qcon and Hcon values significantly higher than the other playing positions, regardless of the angular velocity used.
Conclusions:
U-15, U-17, and U-20 athletes do not have the same level of strength. The goalkeepers demonstrated high strength values, suggesting the importance of specific training for each game position.
| eISSN: | 1899-1955 |
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