Sex-related and age-related differences in knee strength of basketball players ages 11–17 years

Saved in:
Bibliographic Details
Title translated into German:Geschlechts- und altersbezogene Unterschiede der Kraft im Kniegelenk von Basketballspielern zwischen elf und siebzehn Jahren
Author:Buchanan, Patricia A.; Vardaxis, Vassilios G.
Published in:Journal of athletic training
Published:38 (2003), 3, S. 231-237, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Electronic resource (online) Print resource
ISSN:1062-6050, 0160-8320, 1938-162X
Online Access:
Identification number:PU201012009355


Objective: To assess hamstrings and quadriceps strength of basketball players ages 11–13 and 15–17 years. Design and Setting: This cross-sectional study occurred during the 2000 American Youth Basketball Tour National Tournament. We investigated whether sex- or age-related strength differences existed among study participants. Subjects:Forty-one tournament participants (22 girls, 19 boys; 11–13 or 15–17 years old) who reported no history of knee sprain or surgery were recruited. Measurements: We used a Cybex II dynamometer to obtain isokinetic concentric peak torques relative to body mass (Nm/kg) at 60°/s for hamstrings and quadriceps bilaterally. From average peak torques, we determined ipsilateral hamstrings:quadriceps and homologous muscle-group ratios. Results: Correlations between hamstrings and quadriceps strength measures ranged from 0.78 to 0.97. Players 15–17 years old had greater relative hamstrings and quadriceps strength than 11- to 13-year-old athletes. Age and sex interacted significantly for quadriceps strength. The quadriceps strength of 15- to 17-year-old girls did not differ from that of 11- to 13-year-old girls, whereas 15- to 17-year-old boys had stronger quadriceps than 11- to 13-year-old boys. Boys 15–17 years old had greater quadriceps strength than girls 15–17 years old. Conclusions: This study is unique in providing normative data for the hamstrings and quadriceps strength of basketball players 11–13 and 15–17 years old. Age-related strength differences did not occur consistently between the sexes, as girls 11–13 and 15–17 years old had similar relative quadriceps strength. Verf.-Referat