遠紅外線處理對膝屈肌群離心運動引起本體感覺變化恢復的影響

Introduction: Participation in unfamiliar eccentric exercise (EC) can induce delayed onset muscle soreness (DOMS), leading to impaired proprioception and affecting daily activities and sports performance for 5-10 days. Far-infrared radiation (FIR) is a non-invasive, easily implemented method for irradiating deep tissues in the human body. However, the effects of FIR on the recovery of impaired proprioception in the hamstrings remain unclear. Purpose: To investigate the effects of FIR on impaired proprioception recovery following maximal EC of the knee flexors (KF) in adult women. Methods: Healthy, sedentary adult women (21 ± 1 years) were recruited and randomly assigned into FIR and placebo groups (SH) (n = 9 per group). All participants performed 10 sets of 10 maximal isokinetic (30°/s) eccentric contractions in their non-dominant KFs. DOMS; position sense at knee flexion angles of 30°, 45°, and 60° (PS30-PS60); and force sense targeting 30% of pre-exercise maximal isometric contraction torque (MVC) were measured before and 0.5, 24, 48, 72, 96, and 120 hours after EC. The FIR and SH groups received daily 30-min FIR and pseudo-FIR (sham) treatments, respectively, which were applied to the KF 1, 25, 49, and 73 hours after EC. All results were analyzed by two-way analysis of variance and Pearson’s product-movement coefficient correlation. Results: Similar magnitudes of change (p ＞ .05) were observed for all dependent variables 0.5 hours after EC in both the FIR and SH groups. The observed changes in all dependent variables (peak DOMS: 15 mm, peak PS45 error: -8%, peak FM error: -26%) were significantly smaller (p ＜ .05) following four FIR treatments within three consecutive days after EC than following four sham treatments (48 mm, -15%, -37%). A significant correlation was observed between peak DOMS and peak changes in PS30-PS60 and FM (r =.708-.908; p ＜ .05). Conclusion: These results show that FIR treatment accelerated recovery of impaired proprioception after EC-induced DOMS in the KF, which are prone to strain.