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Physical exercise has been shown to inhibit experimental pain response in the post-exercise period. Modulation of the pain system may be differentiated between muscle sites engaging in contractile activity. The purpose of this study was to assess the pain response at remote and local muscle sites following aerobic exercise at different work intensities. Participants included 10 healthy and physically active males (mean age ± SD, 21.2 ± 3.4). Somatic pressure pain threshold (PPT) at the rectus femoris (local) and brachioradialis (remote) muscle site was measured at before (Pre), 5 min after (Post1), and 15 min after (Post2) aerobic cycling exercise at 70 and 30 % of peak oxygen uptake (VO 2peak ) performed on different occasions in a counterbalanced order, separated by minimum of 3 days interval. Repeated measures ANOVA for PPT reveals significant main effect for time (f = 3.581,  p  = 0.049, observed power = 0.588) and muscle site (f = 17.931,  p  = 0.002, observed power = 0.963). There was a significant interaction shown for exercise intensity by time ( f  = 11.390,  p  = 0.012, observed power = 0.790). PPT at rectus femoris following cycling exercise at 70 % of VO 2peak  reveals a significant increase between Pre-Post1 ( p  = 0.040). PPT for rectus femoris following cycling exercise at 30 % of VO 2peak  revealed a significant decrease between Pre-Post1 ( p  = 0.026) and Pre-Post2 ( p  = 0.008). The PPT for brachioradialis following cycling exercise at 30 % of VO 2peak  revealed a significant decrease between Pre-Post1 ( p  = 0.011) and Pre-Post2 ( p  = 0.005). These results show that aerobic exercise increases PPT locally at the exercise muscle site following exercise at 70 % of VO 2peak  but reduces PPT following exercise at 30 % of VO 2peak .

Differential pain response at local and remote muscle sites following aerobic cycling exercise at mild and moderate intensity