Sex-Related and Age-Related Differences in Knee Strength of Basketball Players Ages 11-17 Years.

摘要: Patricia A. Buchanan, ATC, PT, GCFT, contributed to conception and design; acquisition analysis interpretation of thedata; drafting, critical revision, final approval the article. Vassilios G. Vardaxis, PhD, anddesign; data; revision article.Address correspondence School Human Movement, Sport, Leisure Studies,Bowling Green State University, Bowling Green, OH 43403. Address e-mail pbuchan@bgnet.bgsu.edu.Objective:To assess hamstrings quadriceps strength ofbasketball players ages 11–13 15–17 years.Design Setting: This cross-sectional study occurredduring 2000 American Youth Basketball Tour National Tour-nament. We investigated whether sex- or age-related strengthdifferences existed among participants.Subjects: Forty-one tournament participants (22 girls, 19boys; years old) who reported no history ofknee sprain surgery were recruited.Measurements:We used a Cybex II dynamometer obtainisokinetic concentric peak torques relative body mass (Nm/kg) at 608/s for bilaterally. From av-erage torques, we determined ipsilateralhamstrings:quad-riceps homologous muscle-group ratios.Results: Correlations between quadricepsstrength measures ranged from 0.78 0.97. Players 15–17years old had greater than 11- 13-year-old athletes. Age sex inter-acted significantly strength. The 15- 17-year-old girls did not differ that 11-to whereas boys stron-ger boys. Boys yearsold old.Conclusions: is unique in providing normativedata basketballplayers old. Age-related dif-ferences occur consistently sexes, as girls11–13 similar quadricepsstrength.Key Words: isokinetics, adolescents, injury prevention,quadriceps,