Research purpose: To investigate the effects of hypoxia and normoxia on heart rate variability (HRV) and blood pressure (BP) after 5 weeks of high-intensity interval training (HIT) in female collegiate students. Research method: 24 female collegiate students, who didn’t have regular exercise previously, were recruited to participate in the study. The basic characteristics of age, height and BMI were 20.9±0.6 yr, 163.2±0.8 cm and 25.8±0.5 kg/m2 . They were divided into 2 groups randomly, which were normoxic HIT group (NC-HIT) and hypoxic HIT group (HC-HIT). Exercise intervention lasted for 5 weeks with 4 days/week and 60 8-12 s cycling exercise/day. The initial load was 1 kg, and if the whole 60 groups were finished in 2 continuous times, the load was increased by 0.5 kg. The oxygen content in HC-HIT was equal to 2500 meter altitude. Before and after the intervention, an 8-12 s HIT test with 1kg load were conducted respectively. Sitting BP was recorded at the time points of 20 min before HIT and 5, 10, 20, 30, 40, 50, 60 min after HIT. Sitting HRV was recorded at 20 min before HIT and 5, 20, 40, 60 min after HIT, while exercise HRV was also recorded. Supine BP and HRV were recorded at 20 min before HIT and 90 min after HIT. Research results: 1) After one acute HIT, MeanHR, LFn and LF/HF were significantly increased; RMSSD, tri-index, HFn, SD1 and SampEn were significantly decreased. Diastolic BP (DBP) at pt0, 20, 50 min were significantly increased, and systolic BP (SBP) at pt20 min was significantly increased (p.05). Research conclusion: Acute HIT can cause obvious volatility in HRV and BP. 5 weeks of HIT can improve HRV and DBP in 2 groups, but had no effects on SBP. Hypoxia training in improving HRV and BP remains to be further studied.

研究目的：探討女大學生在低氧或常氧環境下經過高強度間歇運動訓練後 心率變異以及血壓的變化情況，探究低氧或常氧下進行高強度間歇運動對女大 學生心率變異和血壓的影響。 研究方法：24 名女大學生，無系統訓練史，自願參加本研究，年齡 20.9± 0.6 yr，身高 163.2±0.8 cm，BMI 25.8±0.5 kg/m2。隨機分為常氧運動組（NC-HIT） 和低氧運動組（HC-HIT）。在介入前後分別進行 20 min 的 8-12s HIT 測試，即 8 s 最大全力蹬車、12 s 休息間歇，共 60 組，負重均為 1 kg。記錄運動前、運動 後即刻、5、10、20、30、40、50、60 及 90 min 坐位血壓；運動前 20 min、運 動中以及運動後 0-5、20、40、60 min 的坐位 HRV；運動前 105 min 以及運動後 90 min 的靜卧血壓及卧位 HRV。兩組運動方案相同，高強度間歇運動訓練 4 次 /週，5 週；起始負重 1 kg，當連續 2 次完成 60 組後負重增加 0.5 kg，依次累加。 HC-HIT 組模擬低氧的海拔高度為 2500 m，NC-HIT 為常氧環境。 研究結果：1）一次急性 HIT 運動後、運動中及運動後的 MeanHR、LFn、LF/HF 明顯升高，RMSSD、tri-index、HFn、SD1 及 SampEn 明顯下降；pt0、20、50 min 的 DBP 顯著升高；pt 20 min 的 SBP 顯著升高（p.05）。 研究結論：急性 HIT 可以造成 HRV 的明顯波動以及血壓升高；5 週 HIT 運 動介入可以改善運動中及運動後的 HRV 及運動後的舒張壓，但對收縮壓無影 響；與常氧環境相比，低氧下 HRV 及血壓無明顯差異，低氧訓練對於 HRV 及 血壓的改善效果有待進一步研究。 關鍵字：低氧，常氧，高強度間歇運動，心率變異，血壓