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(a) Cardiovagal (HF-HRV) response to pain (compared with rest) for the entire 6-min run demonstrated reduced HF-HRV power during PAIN. (b) HF-HRV response to pain (compared with rest), evaluated in three consecutive 2-min windows across the entire run, demonstrated reduced HF-HRV power during PAIN for the initial 2-min period only. *p<0.05; statistical significance testing was Bonferroni-corrected for multiple comparisons.
