The purpose of this study was to examine anaerobic power, skinfold estimates of relative fat and body weight of adolescent wrestlers during a wrestling season. High school males (n = 15), mean (± SEM) age 16.1 ± 0.2 years, who were voluntarily losing weight for interscholastic wrestling competition were recruited for this study. Weight (WT), height, relative fat (RF), fat-free weight (FFW) and anaerobic power of the arms were measured during preseason, twice in the early season and late season. Anaerobic power was measured on an isokinetic arms crank ergometer using the standard Wingate test protocol and analyzed in terms of mean arm power (MAP), relative mean arm power (RMAP), peak power (PP), percent fatigue (PF) and fatigue slope (FS). Repeated measures ANOVA were used to test for differences in WT, RF, MAP, RMAP, PP, PF and FS at the times of measurement during the wrestling season. The results revealed significant decreases in WT (67.1 ± 3.3 kg to 63.5 ± 3.4 kg), RF estimates (11.3 ± 1.0 to 9.3 ± 0.5) and FFW estimates from preseason to late season, respectively. MAP (±SEM) was 375 ± 17 watts and 362 ± 16 watts in the preseason and late season, respectively. No significant changes occurred for MAP, RMAP, PP, PF and FS during the season. Although there was a tendency for decreased absolute power and increased relative power, we concluded that anaerobic power did not change significantly during the season and was not adversely affected by weight loss.