Fig. 4From: Combination of whole body cryotherapy with static stretching exercises reduces fatigue and improves functioning of the autonomic nervous system in Chronic Fatigue SyndromeCFS and HC mean values (± SE) at rest of A LFnu RRI (normalized units of low-frequency RRI); B HFnu RRI (normalized units of high-frequency RRI); C LF/HF (ratio of LFnu-dBP to HFnu-RRI); D LF/HF sBP (ratio of LFnu sBP fo HFnu sBP)Back to article page