Impact of 30-minute and 90-minute Naps on Aerobic and Anaerobic Intermittent Performance in Collegiate Soccer Players

Purpose: This study aims to investigate the effects of 30-minute and 90-minute naps on collegiate soccer players' aerobic and anaerobic performance following a normal night of sleep, and to compare the performance differences between the two nap durations. Patients and Methods: A total of 25 male collegiate soccer players (age: 20 +/- 1 years, height: 180.4 +/- 5.6 cm, weight: 72.1 +/- 4.2 kg, BMI: 22.1 +/- 2.2 kg<middle dot>m(-)(2)) participated in the RAST and 30- 15. Intermittent fitness test (IFT) under three conditions: no nap (N0), 30-minute nap (N30), and 90-minute nap (N90). Results: Post-nap assessments showed significant improvements in peak power per weight (p = 0.007, eta(2) = 0.13), minimum power per weight (p < 0.001, eta(2) = 0.25), and average power per weight (p < 0.001, eta(2) = 0.28) in the RAST test, with no notable differences between the N30 and N90 groups. Additionally, the fatigue index (FI) in the N90 group significantly decreased compared to N0 (p = 0.005, d = 0.86). Both N30 and N90 groups exhibited higher VIFT values than the N0 group (p < 0.001, eta(2) = 0.23). However, no significant changes were noted in average heart rate (p = 0.198) or perceived exertion (RPE) (p = 0.376) during the 30- 15 IFT after napping. Conclusion: Napping effectively enhances the aerobic and anaerobic performance of collegiate soccer players following a normal night of sleep. Implementing strategic napping may be beneficial for athletes seeking to optimize their performance before training or competition.