Acute response of finger circulation to force and vibration applied to the palm of the hand

Reductions in finger blood flow in men and women induced by 125-Hz vibration: association with vibration perception thresholds

“…This suggests that mechanoreceptors, most likely the Pacinian system, are involved in some of the changes in FBF caused by vibration. Previous studies have hypothesized that vibration may elicit a central sympathetic reflex through the activation of mechanoreceptors (7,11,19,31). The subcutaneous Pacinian corpuscles are anatomically connected with sympathetic nervous fibers (32) and neurophysiological evidence shows they are highly sensitive to vibration at frequencies between ϳ63 and 500 Hz (15,38).…”

“…The reductions in FBF were most pronounced in fingers on the vibrated hand but were also present in fingers on the nonvibrated hand. Previous studies have found that 125-Hz vibration applied to one hand can reduce FBF in fingers on both exposed and unexposed hands of healthy subjects and vibration-exposed workers with or without vascular disorders and that the extent of the reduction in FBF depends on the magnitude of the vibration (5,19,34). Bovenzi et al (5) reported that 15-min exposure of the right hand to 125-Hz vibration produced greater reductions in FBF on both the exposed and unexposed hand as the acceleration magnitude increased in four steps from 5.5 to 62 ms Ϫ2 r.m.s.…”

Effect of prior exposure to hand-transmitted vibration on cold response of digital arteries

“…In this study, the force applied to the palm of the hand and the frequency and magnitude of the vibration stimulus were chosen on the basis of the results of our previous experimental investigations which showed that exposures to a contact force of 5 N and vibration with a frequency of 125 Hz at an acceleration magnitude of 64 m s -2 r.m.s. (unweighted) were associated with significant reductions of finger blood flow when compared to resting conditions with no force and no vibration [7,15].…”

Frequency-dependence of Psychophysical and Physiological Responses to Hand-transmitted Vibration

“…A series of experimental studies involving collaboration between the Universities of Trieste in Italy and Southampton in the UK has used finger plethysmography to measure changes in finger blood flow during and following exposure to vibration applied to the finger or hand and investigate how vasoconstriction depends on the frequency of vibration [33][34][35] , the magnitude of vibration 33,36,37) , the duration of vibration 37,38) , intermittent vibration 39) , and the force applied by the hand or finger 35,40) . Related studies have further investigated the effects of the frequency of vibration 41) , the magnitude of vibration 42) , temperature 43) , and individual variability 42,44) .…”

“…Modest levels of force applied by a finger can have a large effect on finger blood flow, possibly due to the constriction of local blood vessels 35,40) . Similarly, with force applied by the palm of the hand, blood flow may be reduced in fingers on the exposed hand, probably due to compression of parts of the vascular system serving the fingers 12) .…”