Blood flow in the tibialis anterior muscle by photoplethysmography during foot-transmitted vibration

Abstract

Photoplethysmography (PPG) was used to detect changes in the anterior tibial muscle blood flow (MBF) during foot-transmitted vibration in six healthy subjects. A filter was developed for reducing the vibration-induced artefacts in the PPG signal. The vibration applied was random with constant acceleration power density in the range 5-2000 Hz with an acceleration of 16-46 m s(-2) (rms). The application of the filter technique showed a dramatic reduction in the vibration-induced artefacts and distortion of the PPG signal was negligible. The mean ratio and correlation coefficient of MBF originating from filtered and non-filtered PPG signals was [mean (SD)] 0.89 (0.04) and 0.99, respectively. This made it possible to detect a relative increase in MBF of 20% during an acute vibration exposure. The results suggest that the use of the filter enables MBF to be measured by PPG during vibration, thus extending the range of applications of the PPG technique to include ergonomic conditions.

Why Can Whole Body Vibration (WBV) Cause Redness on Volunteers? The Effect of Mechanical Vibration and Anxiety on Peripheral Blood Flow

“…One study 3 in dogs and 2 studies 4,6 in humans used similar amplitude and frequency to that used in the experimental study by GRAVI HB /UFMG, arriving to the same conclusions, corroborating to the hypothesis of the study. Therefore, although the region investigated was different, similar conclusion may be drawn.…”

Effect of vibration on muscle perfusion: a systematic review

“…The reflexive muscle contractions in turn cause an increase in local metabolic rate , necessitating an increase in blood flow via local vasodilatation. Of the remaining 13 studies Zhang et al, 2003;Stewart et al, 2005;Button et al, 2007;Cochrane et al, 2008bCochrane et al, , 2010Hazell et al, 2008;Lythgo et al, 2009;van Duijnhoven et al, 2010a,b;Herrero et al, 2011a,b), which did not use NIRS to assess perfusion, nine reported a positive effect of vibration on muscle perfusion Zhang et al, 2003;Stewart et al, 2005;Lythgo et al, 2009;van Duijnhoven et al, 2010a,b;Herrero et al, 2011a,b). This was not evident from the results of this review, and therefore, there may be other potential mechanisms involved in vibration-induced changes in muscle perfusion.…”

“…It was possible to calculate the percentage change in muscle perfusion as a result of vibration in 10 studies Zhang et al, 2003;Stewart et al, 2005;Button et al, 2007;Mulder et al, 2007;Lythgo et al, 2009;Herrero et al, 2011a,b). The variety of different outcome measures and vibratory loads used within and across studies resulted in 26% change outcomes (Table 4).…”

“…The variety of different outcome measures and vibratory loads used within and across studies resulted in 26% change outcomes (Table 4). In a single RCT , six different vibration frequencies and two different vibration amplitudes were used to compare the effect of 12 different vibratory loads on mean blood flow velocity (MBV) in the common femoral artery (Table 4) When all eight studies Zhang et al, 2003;Stewart et al, 2005;Lythgo et al, 2009;Herrero et al, 2011a,b) for which it was possible to calculate both vibratory load and percentage change in the relevant measure of muscle perfusion were included in the regression analysis, there was a statistically significant positive relationship between percentage change in muscle perfusion and vibratory load (r 2 = 0Á60; P<0Á001) ( Fig. When weighted, based on sample size, there was a mean percentage increase of 34Á2%.…”

“…Percentage change in MBV could be explained by the following equation:Percentage change in MBV ¼ ð0Á0062 Â vibratory loadÞ þ 8Á68%Regression analysis using outcomes from the remaining seven studiesZhang et al, 2003;Stewart et al, 2005; Herrero et al, 2011a,b) for which it was possible to calculate both vibratory load and percentage change in the relevant measure of muscle perfusion again revealed a significant positive relationship between percentage change in measure of muscle perfusion (r 2 = 0Á76; P<0Á001). Regression analysis revealed a statistically significant positive relationship between percentage change in MBV and vibratory load (r 2 = 0Á94; P<0Á001).…”