Purpose To investigate, longitudinally, short-term power output in relation to sex and concurrent changes in age, body mass, fat free mass (FFM), and maturity status. Methods Multiplicative multilevel modeling which enables the effects of variables to be partitioned concurrently within an allometric framework was used to analyze the peak power (PP) and mean power (MP) of 388 11-18 year-olds. Multilevel models were founded on 763 (405 from boys; 358 from girls) determinations of PP and MP from Wingate anaerobic tests, supported by anthropometric measures and maturity status. Results In both sexes, PP and MP were significantly (p
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