Near-infrared spectroscopy-derived total haemoglobin as an indicator of changes in muscle blood flow during exercise-induced hyperaemia |
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| Authors: | Thiago Silveira Alvares Gustavo Vieira de Oliveira Rogério Soares Juan Manuel Murias |
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| Institution: | 1. Postgraduate Program in Bioactive Products and Biosciences, Federal University of Rio de Janeiro, Rio De Janeiro, Brazilalvares@macae.ufrj.br;3. Postgraduate Program in Bioactive Products and Biosciences, Federal University of Rio de Janeiro, Rio De Janeiro, Brazil;4. Faculty of Kinesiology, University of Calgary, Calgary, Canada https://orcid.org/0000-0002-9877-683X;5. Faculty of Kinesiology, University of Calgary, Calgary, Canadahttps://orcid.org/0000-0002-6460-6453 |
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| Abstract: | ABSTRACTBlood flow changes in response to exercise have been attributed, among other factors, to the effect of vasodilators factors on the microvasculature, suggesting a close relationship between small blood vessels and conducting arteries. The main purpose of this study was to determine the relationship between the changes in near infrared spectroscopy (NIRS)-derived total haemoglobin (tHb]) and muscle oxygen saturation (SmO2) signals and femoral artery blood flow in response to resistance exercise at fast- and slow-velocity muscle contraction. The study randomised crossover design included twelve participants. NIRS and blood flow measurements were continuously monitored before, during, and 5 min after the exercise protocol. There was a significant correlation between tHb] reperfusion slope (tHb]slope) and peak blood flow (BFpeak) after slow- and fast-velocity muscle contraction (r = 0.83, p = 0.0008 and r = 0.72, p = 0.0080, respectively). No significant correlation existed between the SmO2 reperfusion slope (SmO2_slope) and BFpeak after both slow- and fast-velocity muscle contraction exercise (r = ?0.46, p = 0.1253 and r = 0.33, p = 0.2841, respectively). This study demonstrated a strong relationship between the NIRS-derived tHb] and Doppler ultrasound BF during the recovery period of dynamic resistance exercise at both slow- and fast-velocity contraction. |
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| Keywords: | Near-infrared spectroscopy microcirculation blood flow resistance exercise |
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https://orcid.org/0000-0002-9877-683X;5. Faculty of Kinesiology, University of Calgary, Calgary, Canada