The acquisition of lean body mass (LBM) during childhood and adolescence must be a main concern to ensure motor development and healthy growth. Participation in regular physical activity programs during the growth period plays a positive role in bone and lean mass accrual in addition to diverse health-derived benefits but there is need to consider account for biological maturity and body size.
Methodologies to predict skeletal muscle mass (SMM) or fat-free mass (FFM) are not error-free. Thus, the relationship between performance and muscularity may be affected. The analysis of the associations between known models to estimate LBM with anaerobic performance (strength) should be pertinent to evaluate construct validity.
The relationship between strength and muscle size has been extensively explored in adults but less is known in adolescents. Furthermore, hydration has been barely associated with anaerobic performance. This is a paradoxical situation because the child is mainly involved in high intensity and short duration exercises in most daily tasks, spontaneous physical activity or sports. Three different studies were carried out in a sample of children, adolescents, and young adults.
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