Multilevel modelling of longitudinal changes in isokinetic knee extensor and flexor strength in adolescent soccer players.
Ann Hum Biol
; 45(5): 453-456, 2018 Aug.
Article
in En
| MEDLINE
| ID: mdl-30380339
ABSTRACT
The purpose of the study was to model the longitudinal development of knee extension (KE) and flexion (KF) strength in adolescent soccer players. A mixed-longitudinal sample composed of 67 soccer players aged 11.0-13.9 years at baseline was followed on three-to-five occasions over 5 years. Stature, body mass and several skinfold thicknesses were measured. Fat mass was estimated from skinfolds and fat-free mass (FFM) derived. Skeletal age was estimated with the TW2-RUS protocol. An isokinetic dynamometer was used to obtain peak torque of KE and KF from concentric assessments at an angular velocity of 180°/s. Multilevel random effects regression analyses were performed. Among youth soccer players aged 11-16 years, isokinetic strength of the knee muscle groups was reasonably predicted from chronological age (CA), stature and FFM KE = -66.170 + 5.353 × (CA) + 0.594 × (CA2) + 0.552 × (stature) + 1.414 × (FFM), and KF = -9.356 + 2.708 × (CA) + 1.552 × (FFM). In conclusion, CA per se accounted for annual increments of 5.4 Nm in KE and 2.7 Nm in KF.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Muscle Strength
/
Isometric Contraction
/
Knee
/
Knee Joint
Type of study:
Prognostic_studies
/
Risk_factors_studies
Limits:
Adolescent
/
Child
/
Humans
/
Male
Country/Region as subject:
Europa
Language:
En
Journal:
Ann Hum Biol
Year:
2018
Document type:
Article
Affiliation country:
Portugal