Development of some factors limiting physical performance, during 4-year endurance training of boys aged 14-18.
D000293:Adolescent; D000886:Anthropometry; D006128:Growth; D006439:Hemodynamics; D006801:Humans; D008297:Male; D010806:Physical Education and Training; D005082:Physical Exertion; D010809:Physical Fitness; D013997:Time Factors