Background: Our recent study reported that growth ray (GR) irradiation was useful for alleviating delayed-onset muscle soreness from eccentric exercise-induced muscle damage of unilateral elbow flexors in female individuals. It is currently not known whether GR treatment could enhance fatigue recovery of soccer players after a soccer match. Purpose: To investigate the effects of GR intervention on the fatigue recovery of Taiwan’s elite female soccer players after a soccer simulated match. Methods: Twelve Taiwan’s elite female soccer players performed 2 soccer simulated matches using 90-min Loughborough intermittent shuttle test (LIST) separated by 6 months, and received the 60-min GR or sham treatment on the knee extensors (KE) and flexors (KF) at 2, 25, 49, 73 and 97 hours after each soccer simulated match using a counterbalanced and randomized double-blind cross-over design. Changes in maximal voluntary isometric contraction (MVC-KE, MVC-KF) torque and muscle soreness (SOR-KE, SOR-KF) of KE and KF, plasma creatine kinase (CK) activity, countermovement jump (CMJ), 30-m dash, T-Shape agility, 6 x 10-m shuttle run, and Yo-Yo intermittent recovery test level 1 (Yo-Yo r1) were measured before, immediately after, 24, 48, 72, 96 and 120 hours post-exercise, and were compared between the treatments by a two-way ANOVA. Results: The recovery rates of MVC, SOR, CK, CMJ, 30-m dash, T-shape, 6 x 10-m shuttle run, and Yo-Yo r1 were faster (p<0.05) for the GR than for the Sham treatment, during the 60-min GR treatment daily for 4 days after LIST-induced fatigue. Conclusion: These results showed that 4 consecutive days of GR treatment could effectively facilitated the recovery of fatigue and performance markers following a LIST-induced fatigue and impaired performance. Thus, GR treatment may be potentially provided as one of the effective modalities after a soccer match for female soccer players.
|Effective start/end date||2019/08/01 → 2020/07/31|
- Loughborough intermittent shuttle test (LIST)
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