Abstract
Objective To approach effects of change of ambient atmosphere on heart rate( HR) and short-range heart rate variability ( HRV ) in healthy youth. Methods Forty healthy youths were observed by dynamic electrocardiogram(DCG) in a hyperbaric chamber. At the same time,average heart rates at different stages and indexes of HR, SDNN, RMSSD and PNN,,, were recorded,respectivly. Subsequently, the data were disposed with the statistical treatment. Results HR decreased from (87. 28±12. 77) /min to (76. 08±10.74) /min before and in boosting pressure, and reached (75. 30±12. 06) /min at high pressure ( P < 0.01). HR accelerated gradually when ambient pressure had returned to normal. Data of SDNN (index of sympathetic and pneumogastric con-tonicity), RMSSD and PNNjo (indexes of pneumogastric tonicity) increased or decreased by boosting or depressing of ambient atmosphere. Conclusions Changes of ambient atmosphere have much effect on HR and short-range HRV. Cardiovascular fuction of autonomic nerve may be deranged when ambient atmosphere decreased quickly. Key words: Ambient atmosphere; Hyperbaric chamber; Dynamic electrocardiogram; Heart rate; Heart rate variability
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