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Purpose Hot peat baths (40 - 45 °C) are used in rehabilitation medicine to treat pain, increase perfusion and relax muscles. Because of substantial heat stress (core body temperature increased by 1 - 1.5 °C within 30 min) patientslinear HRV parameters are influenced due to sympathovagal activity. The aim of the observational study was to investigate reactions of the cardiac auto- nomic nervous system detected by means of nonlinear parameters of HRV during a peat baths procedure. Methods Cardiovascular healthy non-smoking patients (45.2 ± 8.2 years, 10 male, 19 female) with herniated vertebral discs received a peat bath (40.5 °C) in a rehab hospital. Each bathing procedure consisted of 20 minute recumbent rest (R), 20 minute peat bath (B), and a second 20 min- ute recumbent rest (S). RR-intervals were determined by a2 4 h-ECG-system (Ela medical ® , SORIN GROUP, France). For calculations of the HRV-parameters the last 6.5 min of R, and consecutive subdivisions B1, B2, B3 and S1, S2, S3 (each 6.5 min) were used. Kubios HRV 2.0 software were applied (Kuopio, Finland). Results In the detrended fluctuation analysis (DFA) alpha1 increased from R to B2 continuously (p 0.0 5). In comparison also to linear parameters, correlations provided between alpha1 and LF%, HF% (r = 0.74, p < 0.05), SampleEn and Sha- nEn (r = 0.86, p < 0.05), but not for heart rate. Conclusion Nonlinear parameters of HRV may reflect reactions of the cardiac autonomic nervous system during a peat bath. Our results support their usage as predictors in clinical studies to improve performance.

bmc complementary and alternative medicine

P02.104. Nonlinear parameters of heart rate variability (HRV) – suitable measures to observe physiological outcome during a peat bath in rehabilitation