Instantaneous heart rate increase with dynamic exercise: central command and muscle-heart reflex contributions.
Instantaneous heart rate increase with dynamic exercise: central command and muscle-heart reflex contributions.
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动态运动时瞬时心率增加：中枢命令和肌肉-心脏反射的贡献。
DOI：
10.1152/jappl.1995.78.4.1273
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Mitchell,JH
中科院分区：
文献类型：
--
作者：
Williamson,JW;Nobrega,AC;Winchester,PK;Zim,S;Mitchell,JH
记录了 15 名健康志愿者对自主无负荷自行车和被动诱导自行车 (PC) 的 R-R 间隔 (RRI) 变化。 PC 还与电刺激 (n = 5) 相结合，以增加肌肉机械感受器的激活。计算机以 1,000 Hz 的频率对心电图和腿部肌电图活动进行连续采样，并使用电子触发器来指定 RRI 内踏板运动的瞬间。 RRI 的变化表示为触发触发的时间间隔（起始 RRI）与平均休息时间间隔（4-8 个时间间隔）的差值。自愿卸载循环使起始 RRI 下降幅度最大 [907 +/- 11 (SE) 至 855 +/- 10 毫秒； -5.4+/-0.4%； P < 0.01] 当运动在间隔的前三分之一内开始时。当触发激活发生在间隔的最后三分之一内时，还检测到起始 RRI 的缩短（906 +/- 12 至 875 +/- 11 毫秒；-3.1 +/- 0.4%；P < 0.01）。单独使用 PC 对 RRI 发作没有显着影响。然而，PC+电刺激缩短了起始 RRI（906 +/- 12 至 883 +/- 11 毫秒；-2.5 +/- 0.2%；P < 0.05），但仅限于在间隔的前三分之一内开始运动时。（摘要截断为 250 字）
R-R interval (RRI) changes were recorded from 15 healthy volunteers in response to volitional unloaded cycling and passively induced cycling (PC). PC was also combined with electrical stimulation (n = 5) to increase muscle mechanoreceptor activation. The electrocardiogram and leg electromyographic activity were continuously sampled by computer at 1,000 Hz, and an electronic trigger was used to designate the instant of pedal movement within an RRI. Changes in RRI were expressed as the difference of the interval in which the trigger was activated (onset RRI) and the average of resting intervals (4–8 intervals). Volitional unloaded cycling produced the greatest decrease in the onset RRI [907 +/- 11 (SE) to 855 +/- 10 ms; -5.4 +/- 0.4%; P < 0.01] when movement was initiated within the first one-third of the interval. A shortening of the onset RRI was also detected when trigger activation occurred in the last one-third of the interval (906 +/- 12 to 875 +/- 11 ms; -3.1 +/- 0.4%; P < 0.01). There were no significant effects of PC alone on the onset RRI. However, PC+electrical stimulation shortened the onset RRI (906 +/- 12 to 883 +/- 11 ms; -2.5 +/- 0.2%; P < 0.05) but only when the movement was initiated within the first one-third of the interval.(ABSTRACT TRUNCATED AT 250 WORDS)