US youth cardiorespiratory fitness levels: challenges and solutions.
Nasca
Melita M
MM
D000293:Adolescent; D000367:Age Factors; D002319:Cardiovascular System; D002648:Child; D006801:Humans; D009043:Motor Activity / Q000502:physiology; D010806:Physical Education and Training; D010809:Physical Fitness / Q000502:physiology*; D012016:Reference Values; D012137:Respiratory System; D014481:United States