The Effect Of Relative Intensity On The Magnitude And Duration Of Analgesia Following Acute Exercise

Exercise (EX) induced analgesia has been previously identified. However, the EX prescription necessary to elicit is not consistent. Additionally, duration of analgesic effect following bouts unknown. PURPOSE: To determine intensity on analgesia. Secondly, quantify an acute bout cycling. METHODS: Ten college aged students (4 men; 6 women; age = 20.1 ± 3.1 yrs) underwent 30 minutes a cycle ergometer. Following 5 light cycling (3-4 METS) each subject 20 at 8 METS followed by 5-minute cooldown. Workload was titrated ensure could finish session. EX, remained seated for additional 15 minutes. Oxygen consumption (VO2) measured throughout and recovery period. Minimal pain threshold (MPT) using pressure algometer placed extensor carpi radialis baseline (BSL) 0 min, 15-mins post EX. Blood lactate (BL) also these same time points. Change in MPT (Pre vs min Post EX) quantified two-tailed Student’s T-Test. The sex over 2 x ANOVA. A Pearson’s correlation used evaluate relationship between vs. BL, respiratory exchange ratio (RER), VO2 Data are shown as mean SEM. RESULTS: For all subjects, greater post-EX (53.3 5.5 N) compared with BSL (31.8 6.1 (p < 0.05). Females had increase (29.6 3 ∆N) relative males (15.7 8.6 ∆N; p Further, increased linear fashion when RER (R 0.63) BL 0.76; higher than 5mins (48 6.3 15mins (44.4 5.7 BSL. Sex differences both (BL, r 0.59; RER, 0.47; 0.05) 0.67; 0.52; remained. CONCLUSION: Twenty vigorous least This seems be sensitive intensity. These findings may useful reducing patient levels without need pharmaceuticals.