Colakoglu Muzaffer, Ozkaya Ozgur, Balci Gorkem Aybars
Faculty of Sport Sciences, Ege University, 35100 Izmir, Turkey.
Sports (Basel). 2018 Sep 15;6(3):98. doi: 10.3390/sports6030098.
Cardiovascular drift (CV-Drift) may occur after the ~10th min of submaximal continuous exercising. The purpose of this study was to examine whether CV-Drift is prevented by an intermittent exercise modality, instead of a continuous exercise. Seven well-trained male cyclists volunteered to take part in the study ( V ˙ O: 61.7 ± 6.13 mL·min·kg). Following familiarization sessions, athletes' individual maximal O₂ consumption ( V ˙ O), maximum stroke volume responses (SV), and cardiac outputs (Qc) were evaluated by a nitrous-oxide re-breathing system and its gas analyzer. Then, continuous exercises were performed 30 min at cyclists' 60% V ˙ O, while intermittent exercises consisted of three 10 min with 1:0.5 workout/recovery ratios at the same intensity. Qc measurements were taken at the 5th, 9th, 12nd, 15th, 20th, 25th, and 30th min of continuous exercises versus 5th and 10th min of workout phases of intermittent exercise modality. Greater than a 5% SV decrement, with accompanying HR, increase, while Qc remained stable and was accepted as CV-Drift criterion. It was demonstrated that there were greater SV responses throughout intermittent exercises when compared to continuous exercises (138.9 ± 17.9 vs. 144.5 ± 14.6 mL, respectively; ≤ 0.05) and less HR responses (140.1 ± 14.8 vs. 135.2 ± 11.6 bpm, respectively; ≤ 0.05), while mean Qc responses were similar (19.4 ± 2.1 vs. 19.4 ± 1.5 L, respectively; > 0.05). Moreover, the mean times spent at peak SV scores of exercise sessions were greater during intermittent exercise (1.5 vs. 10 min) ( < 0.001). In conclusion, intermittent exercises reduce CV-Drift risk and increases cardiac adaptation potentials of exercises with less physiological stress.
心血管漂移（CV - 漂移）可能在次最大强度持续运动约10分钟后出现。本研究的目的是检验间歇性运动方式而非持续运动是否能预防CV - 漂移。七名训练有素的男性自行车运动员自愿参与该研究（最大摄氧量：61.7±6.13毫升·分钟·千克）。在熟悉训练阶段后，通过一氧化二氮再呼吸系统及其气体分析仪评估运动员的个体最大耗氧量（V˙O）、最大每搏输出量反应（SV）和心输出量（Qc）。然后，以自行车运动员60%的V˙O进行30分钟的持续运动，而间歇性运动由三次10分钟组成，运动/恢复比例为1:0.5，强度相同。在持续运动的第5、9、12、15、20、25和30分钟以及间歇性运动方式的运动阶段的第5和10分钟测量Qc。每搏输出量下降超过5%，同时心率增加，而心输出量保持稳定，这被视为CV - 漂移标准。结果表明，与持续运动相比，间歇性运动期间的每搏输出量反应更大（分别为138.9±17.9与144.5±14.6毫升；P≤0.05），心率反应更小（分别为140.1±14.8与135.2±11.6次/分钟；P≤0.05），而平均心输出量反应相似（分别为19.4±2.1与19.4±1.5升；P>0.05）。此外，间歇性运动期间达到运动高峰每搏输出量分数的平均时间更长（1.5与10分钟）（P<0.001）。总之，间歇性运动降低了CV - 漂移风险，并在生理压力较小情况下增加了运动的心脏适应潜力。
