Hamamatsu University School of Medicine, University Hospital , Department of Rehabilitation, Shizuoka, Japan.
Rehabilitation Sciences, Seirei Christopher University , Shizuoka, Japan.
J Sports Sci Med. 2014 Dec 1;13(4):881-7. eCollection 2014 Dec.
The oObjective of the study was to investigate whether the occurrence of cardiac-locomotor synchronization (CLS) affects oxygen pulse (O2 pulse, mL/beat) during walking. Twelve healthy men were studied under two treadmill protocols. The CLS protocol involved subjects walking at a frequency of their heart rate (HR) to induce CLS. The free protocol (reference) involved subjects walking at a self-selected cadence. The treadmill load was equal between the two protocols and was adjusted so that the subject's HR was maintained at approximately 120 bpm. Electrocardiographic signals, foot switch signals, and oxygen consumption (VO2) were measured continuously for 10 min after the heart rate reached a steady state. VO2, O2 pulse, and mean HR were calculated. VO2 and O2 pulse were significantly higher in subjects in the CLS protocol compared to those in the free protocol. However, mean HR was not different between the two groups. The synchronization strength was significantly related to the increase in O2 pulse in subjects in the CLS protocol compared with those in the free protocol. These results suggest that the occurrence of CLS enhances O2 pulse by increasing the strength of CLS during walking. Key PointsTwelve healthy men walked at a frequency of their heart rate (CLS protocol) and at a self-selected cadence (free protocol).Walking at the frequency of heart rate would induce the CLS by entrainment.Oxygen pulse was significantly higher in subjects in the CLS protocol compared to those in the free protocol.The occurrence of CLS enhances oxygen pulse by increasing the strength of CLS during walking.
本研究旨在探讨心运动同步（CLS）的发生是否会影响行走时的氧脉冲（O2 脉冲，mL/beat）。12 名健康男性在两种跑步机方案下进行了研究。CLS 方案涉及受试者以心率（HR）的频率行走以诱导 CLS。自由方案（参考）涉及受试者以自定的步频行走。两种方案的跑步机负荷相等，并进行调整，以使受试者的 HR 保持在大约 120 bpm。在心率达到稳定状态后，连续 10 分钟测量心电图信号、脚踏开关信号和耗氧量（VO2）。计算 VO2、O2 脉冲和平均 HR。与自由方案相比，CLS 方案中的受试者 VO2 和 O2 脉冲明显更高，但两组的平均 HR 无差异。与自由方案相比，CLS 方案中的受试者 CLS 同步强度与 O2 脉冲的增加呈显著相关。这些结果表明，在行走过程中，通过增加 CLS 的同步强度，CLS 的发生会增强 O2 脉冲。关键点：12 名健康男性以心率的频率（CLS 方案）和自定的步频（自由方案）行走。以心率的频率行走会通过节律引导产生 CLS。与自由方案相比，CLS 方案中的受试者 O2 脉冲明显更高。CLS 的发生通过增加 CLS 在行走过程中的同步强度来增强 O2 脉冲。
