Mäntysaari M, Antila K, Peltonen T
Eur J Appl Physiol Occup Physiol. 1984;52(3):282-6. doi: 10.1007/BF01015210.
The linear regression equations between heart rate and systolic time intervals were calculated before and during a handgrip test, an orthostatic test, the Valsalva test and a cold pressor test. The subjects were 30 healthy men, average age 20 years. During the 1st min of orthostasis the regression line of the left ventricular ejection time (LVET) was significantly (P less than 0.05) steeper than at rest and that of the pre-ejection period (PEP) was significantly (P less than 0.01) less steep than at rest, and the regression between HR and the PEP/LVET ratio deviated significantly (P less than 0.001) from zero. During the Valsalva maneuver, the regression line of the LVET became significantly (P less than 0.001) steeper than at rest and the regression coefficient of the PEP changed from negative to positive, the difference being significant (P less than 0.001); the regression between HR and the PEP/LVET also deviated significantly (P less than 0.001) from zero. During the cold pressor test the regression line of the electromechanic systole (Q-S2 time) was significantly (P less than 0.01) less steep than at rest. It was concluded that the use of regression equations calculated for the systolic time intervals and heart rate at rest can lead to errors when applied to rate correction of systolic time intervals during an orthostatic, Valsalva, or a cold pressor test.
在握力试验、直立试验、瓦尔萨尔瓦动作试验和冷加压试验之前及过程中，计算心率与收缩期时间间期之间的线性回归方程。研究对象为30名健康男性，平均年龄20岁。在直立位第1分钟时，左心室射血时间（LVET）的回归线比静息时显著更陡（P<0.05），射血前期（PEP）的回归线比静息时显著更平缓（P<0.01），且心率与PEP/LVET比值之间的回归显著偏离零（P<0.001）。在瓦尔萨尔瓦动作过程中，LVET的回归线比静息时显著更陡（P<0.001），PEP的回归系数由负变正，差异显著（P<0.001）；心率与PEP/LVET之间的回归也显著偏离零（P<0.001）。在冷加压试验过程中，机电收缩期（Q-S2时间）的回归线比静息时显著更平缓（P<0.01）。得出的结论是，将静息时计算的收缩期时间间期与心率的回归方程应用于直立试验、瓦尔萨尔瓦动作试验或冷加压试验期间收缩期时间间期的心率校正时，可能会导致误差。
