The mental fatigue impaired beach volleyball attack technical-tactical performance: a crossover and randomized study

The aim of this study was to investigate the effect of mental fatigue on the technical-tactical performance of beach volleyball players. Twelve males young beach volleyball players (16.1 ± 0.9 years old) were recruited to participate in this crossover and randomized study. The simulated match was performed under two conditions (control: 30 min without performing cognitive activities; mental fatigue: 30 min performing Stroop Task). The match is recorded and technical-tactical performance was calculated (coefficient of performance and/or efficiency of serve, serve reception, set, attack, block, and dig actions). The mental fatigue was “moderate” after Stroop Task, and statistically significant compared to the control condition [Mental fatigue: 62.5 mm ± 8.8 Vs. Control: 6.4 mm ± 4.1; p = .0001; ES: 0.9 (moderate effect)]. Moreover, attack coefficient of performance and efficiency was lower in mental fatigue condition that control condition (CP: Mental Fatigue= 1.5 ± 0.4 Vs. Control= 2.3 ± 0.2, p = .001; Eff: Mental Fatigue = 23.7 ± 7.0 Vs. Control = 36.0 ± 9.5; p = .004). In conclusion, mental fatigue impaired attack performance of beach volleyball players (one of the main key to win in this sport). Thus, is recommended avoid cognitive tasks or high cognitive effort before training and matches.