Fig. 2From: Local alternating heat and cold stimulation affects hemodynamics and oxygenation in fatigued muscle tissue and autonomic nervous activity: a single-arm interventional studyMean values of HRV parameters at pre- and post-intervention. a HF and LF. b LF/HF and CVRR. *P < 0.01. Error bars indicate standard deviation. HRV, heart rate variability; HF, high frequency; LF, low frequency; CVRR, coefficient of variation of R-R intervalBack to article page