ffi C31 ffi C 2 3 FUKUDA AU 1010 TEAC ; RD 111T 1 R MODEL.DC 5 WSMR TEACRD 111T 1000Hz/ch A/D ADInstruments

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1 Vol. 13 No Λ1 Λ ffi C FFT Hz LF Hz HF HF LF/HF 3 HFnu LF/HF 1 4) 2;5;6) 2;4) 2) 7) 8) 1 3;5;9) 10) 11;12) 1 13) ±8.3 mean±sd165.6±8.4cm 65.4±9.9kg25.6±4.7% 2 6%Na 2 SO Λ

2 ffi C31 ffi C 2 3 FUKUDA AU 1010 TEAC ; RD 111T 1 R MODEL.DC 5 WSMR TEACRD 111T 1000Hz/ch A/D ADInstrumentsMaclab/400 AppleMacintosh Performa R R R R Hanning window FFT; Fast Fourier Trans formation ADInstruments; HRV extensions Low Frequency Hz LFHigh Frequency Hz HF HFnu nu%normalized unitlf/ HF 14;15) nu(%) = 100 power=(total power power) 5 ±mean±se Wilcoxon signed ranks test 5% p< ±3.6mmHg ±3.0mmHg ±3.4mmHg ±3.5mmHg 111.3±3.8mmHg ±4.4mmHg ±9.8mmHg ±5.1mmHg 110.7±3.3mmHg ±4.7mmHg ±4.2mmHg ±4.1mmHg 62.3±3.5mmHg5 61.3±4.9mmHg ±4.9mmHg1563.7±4.7mmHg 68.3±4.5mmHg5 65.0±4.8mmHg ±4.2mmHg1566.2±3.7mmHg 59.7±2.6 mmhg ±3.4mmHg1061.7±2.3mmHg ±3.0mmHg ± 0.01l/min 0.23±0.02l/min 0.21±0.02l/min 4 HFnu HFnu 54.0±6.8%53.0±6.9% 45.9±7.2% HFnu p<0.05 HFnu 5 LF/HF LF/HF 0.959± ± ±0.533 LF/HF

3 81 1 Changes in heart rate during relaxation in salt water (SW) or water (W) or control (C) condition. Open triangle, SW; open circle, W; closed square, C condition. Values are means ± SE. 2 Changes in blood pressure during relaxation in salt water (SW) or water (W) or control (C) condition. Open triangle, systlic blood pressure (SBP) at SW; open circle, SBP at W; closed square, SBP at C; closed triangle, diastolic blood pressure (DBP) at SW; closed circle, DBP at W; open square, DBP at C. Values are means ± SE. 3 Comparison of oxygen uptake during relaxation in salt water (SW) or water (W) or control (C) conditions. Values are means ± SE. 4 Comparison of HFnu during relaxation in salt water (SW) or water (W) or control (C) conditions. Values are means ± SE. Λp<0.05 vs C condition. p<0.05 LF/HF ) 17) 8) 30 ffi C

4 82 5 Comparison of LF/HF during relaxation in salt water (SW) or water (W) or control (C) conditions. Values are means ± SE. Λp<0.05 vs C condition ) 3 Ogiwara 20) 21;22) 31 ffi C 0.2l/min ) ffi C 27) 31 ffi C HFnu LF/HF HF LF 28) 14 15) LF/HF 31 ffi C Yasue 29) ff p< HFnu p<0.05

5 83 5. LF=HF p< C Bishop PAFrazier SSmith J and Jacobs DPhysiologic responses to treadmill and water running Phys. Sports Med Gleim GW and Nicholas JAMetabolic costs and heart rate responses to treadmill walking in water at different depths and temperaturesam. J. Sports Med Ritchie SE and Hopkins WGThe intensity of exercise in deep-water runningint. J. Sports Med Whitley JD and Schoene LLComparison of heart rate responses water walking versus treadmilwalking Phy. Ther Craig AB and Dvorak MComparison of exercise in air and water of different temperaturesmed. Sci. Sports McArdle WDMagelJRLesmes GR and Pechar GSMetabolic and cardiovascular adjustment towork in air and water at 1825and 33 ffi CJ. Appl. Physiol Onodera SMiyachi MYano HNakamura YKimura KEffect of differences in buoyancy of water on oxygen uptake and heart rate during swimmingmed. Sports Sci ffi C Adlercreutz HKuoppasalmi KNarvanen SKosunen K and Heikkinen RUse of hypnosis in studies of the effect of stress on cardiovascular function and hormonesacta Med. Scand Brune MMagnusson BPersson H and Hallberg LIron losses in sweatam. J. Clin. Nutr McGuigan FJ Arai YSaul PAlbrecht PHartley LHLilly LSCohen RJ and Colucci WSModulation of cardiac autonomic activity during immediately after exerciseam. J. Physiol.256H Pomeranz BMacaulay RJBCaudill MAKutz IAdam DGordon DKilborn KMBarger ACShannon DCCohen RJ and Benson HAssessment of autonomic function in humans by heart rate spectralanalysis Am. J. Physiol.248H ffi C30 ffi C34 ffi C J. Health Sci ffi C34 ffi C38 ffi C

6 84 20Ogiwara MShima J and Kumahara YSignificant increase in immunoreactive atrialnatriuretic polypeptide concentration during head-out water immersionlife Sci camp Jap. J. Sports Sci Jpn. J. Sports Sci Harrison MHEdwards RJCochrane LA and Graveney MJBlood volume and protein responses to skin heating and cooling in resting subjectsj. Appl. Physiol Akselrod SGordon DUbelFAShannon DCBarger AC and Cohen RJPower spectrum analysis of heart rate fluctuation ; A quantitative probe of beat-to-beat cardiovascular controlscience Yasue HTouyama MShimamoto MKato HTanaka S and Akiyama FRole of autonomic nervous system in the pathogenesis of prinzmetal's variant from of anginacirculation Effects of Relaxation in Salt Water on Cardiac Autonomic Nervous System Activity Masahiro NISHIMURA and Sho ONODERA (Accepted May 30, 2003) Key words : relaxation, cardiac autonomic nervous system activity, heart rate, blood pressure, oxygen uptake Abstract The purpose of this study was to make clear the effects of relaxation on cardiac autonomic nervous system activity under three conditions: in salt water (SW), in water (W) or the control (C) conditions. Two males and four females served as subjects (n=6, mean age: 25.3yrs). Water temperature was 31. Heart rate, blood pressure and oxygen uptake were measured during relaxation for each condition. Cardiac autonomic nervous system activity was estimated with power spectrum analysis of heart rate variability. High frequency (HF; Hz) and areas and the ratio of low frequency (LF; Hz) to HF (LF/HF) were used as an indicator of cardiac vagalactivity and sympathetic nervous activity, respectively. There were no significant differences found in blood pressure and oxygen uptake forany of the conditions. Nu (normalized unit; %) of HF during SW and W were significantly higher than C. Heart rate and LF/HF during SW and W were significantly lower than C. These data suggested that cardiac vagalactivity and sympathetic nervous activity during relaxation were affected by immersion. Correspondence to : Masahiro NISHIMURA Department of Health and Sports Sciences, Faculty of MedicalProfessions, Kawasaki University of MedicalWelfare Kurashiki, , Japan (Kawasaki MedicalWelfare Journal Vol.13, No.1, )

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