Maturity status of youth football players: a noninvasive estimate

摘要: PURPOSE: To estimate the biological maturity status of youth football players 9-14 yr old using a noninvasive method and to compare body size contrasting status. METHODS: Subjects were members teams in two central Michigan communities. Height weight measured on 653 boys 8.7-14.6 yr. Heights parents 582 reported subsequently adjusted for overestimation. Decimal age, height, player midparent height used predict mature (adult) boy. Current each was expressed as percentage his predicted provide an Percentage boy z-score classify into groups. ANCOVA, controlling RESULTS: Mean percentages matched those longitudinal reference samples, but there trend higher among older players, suggesting advanced maturation. Overall, 405 classified time/average (69.6% [95%CI 65.7-73.3]), 154 early/advanced (25.5% 23.0-30.3]), only 23 late/delayed (3.9% 2.6-6.0]). The gradient weight, BMI follows: early > time late, differences greater than height. CONCLUSION: attained at given age appears be reasonable indicator needs validated with other more direct indicators (skeletal sexual maturation) applied samples. Language: en