Developmental Changes in Isometric Strength: Longitudinal Study in Adolescent Soccer Players

Joao P. Duarte; João Valente-dos-Santos; Manuel J. Coelho-e-Silva; R. M. Malina; Dieter Deprez; Renaat Philippaerts; Matthieu Lenoir; Roel Vaeyens

doi:10.1055/s-0044-100389

International Journal of Sports Medicine, Inhaltsverzeichnis

Int J Sports Med 2018; 39(09): 688-695
DOI: 10.1055/s-0044-100389

Training & Testing

Developmental Changes in Isometric Strength: Longitudinal Study in Adolescent Soccer Players

Autoren

Joao P. Duarte

¹Faculty of Sports Sciences and Physical Education, University of Coimbra, Coimbra, Portugal

²uid/dtp/04213/2016, University of Coimbra, Coimbra, Portugal
João Valente-dos-Santos

²uid/dtp/04213/2016, University of Coimbra, Coimbra, Portugal

³Faculty of Physical Education and Sport, Lusofona University of Humanities and Technologies, Lisbon, Portugal
Manuel J. Coelho-e-Silva

¹Faculty of Sports Sciences and Physical Education, University of Coimbra, Coimbra, Portugal

²uid/dtp/04213/2016, University of Coimbra, Coimbra, Portugal
R. M. Malina

³Faculty of Physical Education and Sport, Lusofona University of Humanities and Technologies, Lisbon, Portugal
Dieter Deprez

⁴Department of Kinesiology and Health Education, University of Texas, Austin, Texas, USA
Renaat Philippaerts

⁵Club Brugge KV, Brugge, Belgium
Matthieu Lenoir

⁶Department of Movement and Sports Science, Ghent University, Ghent, Belgium
Roel Vaeyens

⁵Club Brugge KV, Brugge, Belgium

⁶Department of Movement and Sports Science, Ghent University, Ghent, Belgium

Abstract

This study aimed to examine longitudinal changes in isometric strength of the knee extensors (ImKE) and knee flexors (ImKF) at 30° and 60°. The sample was composed of 67 players aged 11.0–13.9 years at baseline over five years. Stature, body mass, skinfolds, and isometric strength (ImKE30°, ImKF30°, ImKE60° and ImKF60°) were measured. Fat mass and fat-free mass (FFM) were derived from skinfolds. Skeletal age was obtained using TW2 RUS. Multilevel random effects regression analyses extracted developmental polynomial models. An annual increment on chronological age (CA) corresponded to 5.6 N (ImKE30°), 2.7 N (ImKF30°), 4.6 N (ImKE60°) and 1.5 N (ImKF60°). An increment of 1 kg in FFM predicted isometric strength as follows: 1.2 N (ImKE30°), 2.1 N (ImKF30°), 3.1 N (ImKE60°) and 2.0 N (ImKF60°). The following equations were obtained: ImKE30°=5.759×CA+1.163×FFM; ImKF30°=−19.369+2.691×CA+0.693×CA²+2.108×FFM; ImKE60°=4.553×CA+3.134×FFM; and, ImKF60°=-19.669+1.544×CA+2.033×FFM. Although skeletal maturity had a negligible effect on dependent variables, age and body size, based on FFM, were relevant longitudinal predictors. During adolescence, systematic assessment of knee extensors and knee flexors are strongly recommended to prevent impairment of knee muscle groups.

Key words

multilevel modeling - growth - skeletal maturation - youth athletes

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Referenzen

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