Heart rate variability in women exposed to very cold air (−110 °C) during whole-body cryotherapy |
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Authors: | Tarja Westerlund Arja Uusitalo Juhani Smolander Marja Mikkelsson |
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Institution: | 1. Rheumatism Foundation Hospital, Heinola, Finland;2. Helsinki University Central Hospital, Helsinki, Finland;3. Orton Orthopaedic Hospital and Orton Research Institute, Foundation for Invalids, Helsinki, Finland |
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Abstract: | Heart rate monitoring was used to measure heart rate variability (HRV) at thermoneutral conditions (Ta 24 °C) in healthy women resting in supine position before and after acute and after repeated (3 times a week during a 3-month period) whole-body cryotherapies (WBC), at −110 °C. The observed acute cooling-related increase in high frequency power (HFP) of RR-intervals indicates an increase in cardiac parasympathetic modulation. After 3 months of repeated WBC the increase in parasympathetic tone was attenuated, which may be interpreted as an adaptation of autonomic function. The repeated WBC exposures-related increase in resting low frequency power (LFP) of RR-intervals during the 3 months resembles the response observed related to exercise training. |
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Keywords: | Whole-body cryotherapy Heart rate variability Adaptation of the autonomic nervous system Women |
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