INTRODUCTION: The bathing and sleep processes in physical recovery play an important role in athletes. One of the body recovery is the night sleep. The hot spring water containing high concentration carbon dioxide (CO2 =1000 ppm) has long been applied to the patients suffering from cardiovascular diseases in balneotherapy. The purpose of this study is to examine the physical recovery after artificial high concentration CO2-water immersion in athletes. METHODS: Six healthy college competitive swimmers participated in this study. The subjects performed anaerobic exercise and immersed whole body into tap-water or artificial CO2-water at 38 degrees Celsius for 10 minutes immediately after the exercise. To measure the sleep-wake cycle, accelerometers (FS-760 and 770, ACOS, Japan) was used. The sleep-wake data were analyzed by circadian rhythm analysis software (SleepSign Act2, KISSEI COMTEC, Japan). Sleep variables included time in bed (TIB), sleep period time (SPT), total sleep time (TST), sleep efficiency (SE), and sleep latency (SL). Blood lactate concentration (BLa) was measured by means of Lactate analyzer (Lactate Pro2, LT-1730, Arkray, Japan). RESULTS: BLa in recovery period was significantly lower in CO2-water immersion than that in tap-water immersion (20min after the exercise 2.4±0.8 vs 2.7±0.5 mmol/L p<0.05, 25min after the exercise 1.9±0.6 vs 2.6±0.8 mmol/L p<0.05, 30min after the exercise 1.8±0.4 vs 2.4±0.4 mmol/L p<0.05,). SL was significantly shorter in CO2-water immersion than that in tap-water immersion (7.8±2.3 min vs 16.5±3.8 min p<0.05). SE was significantly higher in CO2-water immersion than that in tap-water immersion (90.3±3.5% vs 83.2±4.6%, p<0.05). Therefore, these results suggest that as CO2-water immersion could raise body core temperature enough, this hyperthermia may cause a deep sleep. CONCLUSION: Sleep after the CO2-water immersion seems to be significantly useful in the physical recovery from fatigue. The rapid decrease in BLa in the CO2-water immersion suggested efficient physical recovery after anaerobic exercise. Therefore, it was suggested that CO2-water immersion is effective for recovery.
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