Relationships between physical activity, physical fitness, muscle strength and nutritional state in 5- to 11-year-old children

Grund A, Wilms B, Forberger K, Krause H, Siewers M, Rieckert H, Müller M. Relationships between physical activity, physical fitness, muscle strength and nutritional state in 5- to 11-year-old children. European journal of applied physiology 2000; 82:425-38.