Recovery of vascular function after exposure to a single bout of vibration.
Krajnak-K; Waugh-S; Johnson-C; Miller-R; Li-S; Andrew-M
Can Acoust 2011 Feb; 39(2):10-11
The goal of this study was to use a model of vibration-induced dysfunction to determine if there are residual effects of a single exposure to vibration on peripheral vascular function, and if there are residual effects, the number of days of rest needed for vascular function to recover after a single exposure. 1)Changes in adrenoreceptor-mediated vasoconstriction are apparent for the first 24 h following a single exposure to vibration. 2) Endothelial-mediated vasodilatation is not affected until 48 h after vibration exposure. 3) Changes in responsiveness to vasoconstricting and vasodilating factors may affect vascular responses to subsequent vibration exposures. 4) Vascular responsiveness returns to control levels after a 7-day recovery period. 5) Additional time-points need to be assessed, but these findings suggest that it may take up to seven days for vascular function to recover after exposure to a single bout of vibration. 6) The acute responses of the human peripheral vascular system to vibratjon are similar to the responses of rats. Thus, it is likely that finger vascular function may also be altered for at least two days following exposure to vibration. 7) Work rotation schedules that allow more than two days of recovery between subsequent bouts of vibration exposure may help reduce the risk of developing the vascular dysfunction that is characteristic of HAVS.
Vibration; Hand-tools; Repetitive-work; Workers; Risk-factors; Biological-effects; Biological-factors; Biological-monitoring; Biomechanical-modeling; Biomechanics; Exposure-assessment; Exposure-levels; Hand-tools; Injury-prevention; Laboratory-animals; Laboratory-techniques; Mathematical-models; Measurement-equipment; Physiological-effects; Physiological-response; Quantitative-analysis; Statistical-analysis; Tools; Vasomotor-system; Vasomotor-system-disorders; Vibration; Vibration-effects; Vibration-exposure
Engineering and Engineering & Control Technology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, West Virginia, USA