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J Strength Cond Res. 2015 Dec;29(12):3380-5. doi: 10.1519/JSC.0000000000000993.

Testosterone Concentration and Lower Limb Power Over an Entire Competitive Season in Elite Young Soccer Players.

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1School of Physical Education and Sport, Department of Sport, University of Sao Paulo, São Paulo, Brazil; 2School of Arts, Sciences and Humanities, University of Sao Paulo, São Paulo, Brazil; and 3Desportivo Brazil, Porto Feliz, Brazil.


The aim of this study was to investigate salivary T changes and its relationship with power performance over a 1-year competitive season in elite under 15 (U15) and under 17 (U17) soccer players. Soccer players were recruited from 1 soccer club that has been participated in the main state and national leagues for these age groups. The soccer players were divided into 2 age categories (U15, n = 16 and U17, n = 23). A resting saliva sample was taken to determine T level, and power was assessed using the countermovement jump test with a bar of 30% of body mass on the athletes' shoulders on 3 occasions (T1: beginning of the competitive season, T2: end of the regular season, and T3: end of the playoffs). There was a decrease in T concentration at the end of the competitive season (T3) as compared with the beginning of the season (T1) for both age categories (p ≤ 0.05). Conversely, power performance parameters were increased for both age groups (U15: mean power and relative mean power and U17: peak power, mean power, relative peak power, and relative mean power; p ≤ 0.05). No significant correlation was identified between the relative changes in T concentration and power performance in both groups. The findings of this study suggest that T changes and power changes are not related.

[Indexed for MEDLINE]

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