1,720,964 research outputs found
Pilot study comparing acute effects of vibration to the palm and finger on finger blood flow
No full text
A pilot study of the effect of push force to the palm and vibration magnitude on finger blood flow
No full textNormal values for finger systolic blood pressure in males and females
No full textObjective: To compare finger systolic blood pressures in males and females and in younger and older persons and provide normal values for all four fingers in younger and older males and females.Methods: Eighty healthy subjects participated in the study: 20 males and 20 females aged 20–30 years, and 20 males and 20 females aged 55–65 years. Finger systolic blood pressures (FSBPs) were measured using strain-gauge plethysmography following local cooling at 30 and 10°C in accord with International Standard 14835-2. The FSBPs were measured simultaneously in the thumb and the four fingers of the dominant hand and the percentage changes in finger systolic blood pressures (%FSBPs) due to the cold provocation were calculated.Results: The median finger systolic blood pressures increased with increasing age in both females and males, with the increase highly significant at 30°C but not at 10°C. The %FSBPs were not significantly affected by the age of males, but were significantly lower in older females than younger females. The FSBPs were lower in females than in males at 30°C but there was no significant difference between genders at 10°C. The %FSBPs were higher in younger females than younger males, but only significantly higher in the middle finger and there were no significant differences between the genders in the older age group. There were only minor differences between the four fingers in the FSBPs at 30 and 10°C. The %FSBPs across the four fingers were similar in the younger subjects and in the older females, but varied with finger in the older males.Conclusion: Although there are some differences in the %FSBPs associated with age, gender, and finger, the differences may be sufficiently small to use a single value criterion when deciding on abnormalities in FSBP associated with cold provocation for persons aged 20–65 years
Multi-channel and single-channel venous occlusion plethysmography for finger blood flow measurement
No full text
Effect of prior exposure to hand-transmitted vibration on cold response of digital arteries
No full textOBJECTIVES: To investigate whether prior exposure to hand-transmitted vibration on the day of a cold provocation test affects the cold response of digital arteries. METHODS: Each of ten healthy men attended two experimental sessions in which their right hands were exposed for 60 min to either contact force alone (5 N) or a combination of contact force (5 N) and 125-Hz vertical vibration with an acceleration magnitude of 64 m s(-2) r.m.s. (unweighted). Finger systolic blood pressure (FSBP) during local cooling to 10 degrees C was measured in the second right finger (exposed hand) and the second left finger (unexposed hand) before exposure and at 30 and 70 min after the end of both exposure conditions. RESULTS: Analysis of repeated measures of FSBP during local cooling by means of an autoregressive model revealed no significant difference in cold-induced vasoconstriction of the digital arteries between exposure to contact force alone and combined exposure to contact force and vibration. There were no significant changes in the cold response of digital arteries over time in either the right or the left hand after exposure of the right hand to either the contact force alone or the combined contact force and vibration. CONCLUSIONS: The results of this experimental study of the influence of prior vibration exposure on the cold test results suggest that in healthy men recent exposure to contact force and moderate levels of hand-transmitted vibration does not affect the response of finger circulation to cold provocation. These findings may be of practical importance for the definition of test conditions in the field, especially the length of time required between the last occupational exposure to tool vibration and the commencement of objective vascular testing.<br/
Acute response of finger circulation to force and vibration applied to the palm of the hand.
No full textOBJECTIVES: This study investigated the effects of force at the palm on acute changes in finger circulation during exposure to vibration. METHODS: Ten persons attended five sessions consisting of the following five successive 5-minute periods: (i) no force and no vibration, (ii) force and no vibration, (iii) force and vibration, (iv) force and no vibration, and (v) no force and no vibration. During the second and fourth periods, the palm of the right hand applied 5 N or 20 N to a platform that vibrated (125 Hz, 64 m/s2 root mean square) during the third period. Finger blood flow was measured in the middle and little fingers of the right (exposed) hand and the middle finger of the left (unexposed) hand. RESULTS: A force of 20 N alone reduced the mean finger blood flow in the ipsilateral and contralateral fingers. Finger blood flow was also reduced by vibration, with greater reductions when vibration was combined with 20 N of force. Vibration caused vasoconstriction in the fingers of both the vibrated and nonvibrated hands. CONCLUSIONS: Force applied to the palm reduced blood flow in the fingers of the exposed hand, probably due to compression of the vascular system supplying the fingers. There was evidence that force may reduce finger blood flow in the contralateral hand, possibly due to a central sympathetic effect. Vibration at 125 Hz applied to the palm of the hand reduced finger blood flow in fingers of that hand and also in a finger of the contralateral hand. In this study, any local effects of vibration were less than those of central sympathetic origin
- …
