心脏对冲动运动和恢复的反应:收缩时间间隔。

European journal of cardiology Pub Date : 1979-12-01
K Kobayashi, P W Kotilainen, B G Haffty, K A Moreau, R L Bishop, D H Spodick
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引用次数: 0

摘要

运动反应取决于工作量及其传递模式。管理一个非常短暂的(“脉冲”)负荷的目的是通过生物对变化速度的敏感性(而不是程度)引起显著的反应。连续记录10名正常受试者在50、100和150 W的短时间(20秒)自行车运动期间和运动后的心电图、收缩时间间隔(STI)和心率(HR)。该方案的目的是确定一种低负荷脉冲型运动挑战,它在以下方面是最优的:(a)再现较长时间(稳态)运动产生的运动变化的时间过程,(b)在可比较的工作负荷下快速实现定量反应,达到部分或全部稳态变化,以及(c)正常受试者没有ST变化。运动的开始产生了最大的变化速率。在相同负荷下,各测量值的方向变化和时间过程与稳态运动和恢复的方向变化和时间过程相似:HR、弹射时间指数(ETI)和校正弹射时间(ETc)急剧增加;预射期(PEP)和PEP/LVET大幅下降。射血时间(LVET)在大多数运动中都很稳定,但在心率下降的情况下,恢复时间却“矛盾地”减少了15秒。对于所有的测量,恢复到控制水平在一分钟内完成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cardiac responses to impulse exercise and recovery: systolic time intervals.

Exercise responses depend on work load and its pattern of delivery. Administering a very brief ("impulse") load aims to elicit significant responses through biologic sensitivity to rate - rather than degree - of change. Electrocardiograms, systolic time intervals (STI) and heart rate (HR) were recorded continuously in 10 normal subjects during and after brief (20-sec) bicycle exercise at 50, 100 and 150 W. The purpose of this protocol was to identify a low load impulse-type exercise challenge which would be optimal in terms of (a) reproduction of the time course of exercise changes produced by longer duration (steady-state) exercise, (b) rapid achievement of quantitative responses reaching some or all of the steady-state changes at comparable work load, and (c) absence of ST changes in normal subjects. The onset of exercise produced the greatest rates of change. Directional changes and time course of all measurements paralleled those of steady-state exercise and recovery at the same loads: HR, ejection time index (ETI) and corrected ejection time (ETc) increased sharply; preejection period (PEP) and PEP/LVET fell sharply. Ejection time (LVET), stable through most of exercise, "paradoxically" decreased for up to 15 sec of recovery despite decreasing heart rates. For all measurements, restitution to control levels was complete by one minute of recovery.

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