Bhattacharya A, Knapp C F, McCutcheon E P, Edwards R G
J Appl Physiol Respir Environ Exerc Physiol. 1977 May;42(5):682-9. doi: 10.1152/jappl.1977.42.5.682.
The vibration parameters for assessing the response of the cardiovascular system to whole-body vibration were studied. Six awake, chronically instrumented canines were restrained with their spines vertical, and exposed to GZ sinusoidal vibration of 2-12 HZ for a constant peak acceleration amplitude of +-1.0 G. Vibration exposures of 30 s with intervening recovery periods of 2 min were employed. The following variables were measured: mean heart rate (MHR), stroke volume (SV), mean aortic flow (MAF), mean aortic pressure (MAP), the peak net force transmitted to the canine/body weight (PNF/BW), and the vibration platform frequency (ft), displacement, and acceleration. The percentage change from control (no vibration) of MAF varied linearly with PNF/BW for all cases. MAF also varied linearly with the log MHR/ft for the number of dogs which primarily changed MHR during the vibration exposures. The response of MAP was minimal in all cases, indicating a decrease in total peripheral resistance with increasing PHF.
研究了用于评估心血管系统对全身振动反应的振动参数。六只清醒、长期植入仪器的犬被固定，使其脊柱垂直，并暴露于2 - 12赫兹的GZ正弦振动中，峰值加速度幅度恒定为±1.0G。采用30秒的振动暴露，中间间隔2分钟的恢复时间。测量了以下变量：平均心率（MHR）、每搏输出量（SV）、平均主动脉血流量（MAF）、平均主动脉压（MAP）、传递到犬体/体重的峰值净力（PNF/BW）以及振动平台频率（ft）、位移和加速度。在所有情况下，MAF相对于对照（无振动）的百分比变化与PNF/BW呈线性变化。对于在振动暴露期间主要改变MHR的犬只数量，MAF也与log MHR/ft呈线性变化。在所有情况下，MAP的反应最小，表明随着PHF增加，总外周阻力降低。
