Reliability of laser Doppler, near-infrared spectroscopy and Doppler ultrasound for peripheral blood flow measurements during and after exercise in the heat
This study examined the test-retest reliability of near-infrared spectroscopy (NIRS), laser Doppler flowmetry (LDF) and Doppler ultrasound to assess exercise-induced haemodynamics. Nine men completed two identical trials consisting of 25-min submaximal cycling at first ventilatory threshold followed by repeated 30-s bouts of high-intensity (90% of peak power) cycling in 32.8 +/- 0.4 degrees C and 32 +/- 5% relative humidity (RH). NIRS (tissue oxygenation index [TOI] and total haemoglobin [tHb]) and LDF (perfusion units [PU]) signals were monitored continuously during exercise, and leg blood flow was assessed by Doppler ultrasound at baseline and after exercise. Cutaneous vascular conductance (CVC; PU/mean arterial pressure (MAP)) was expressed as the percentage change from baseline (% CVCBL). Coefficients of variation (CVs) as indicators of absolute reliability were 18.7-28.4%, 20.2-33.1%, 42.5-59.8%, 7.8-12.4% and 22.2-30.3% for PU, CVC, % CVCBL, TOI and tHb, respectively. CVs for these variables improved as exercise continued beyond 10 min. CVs for baseline and post-exercise leg blood flow were 17.8% and 10.5%, respectively. CVs for PU, tHb (r(2) = 0.062) and TOI (r(2) = 0.002) were not correlated (P > 0.05). Most variables demonstrated CVs lower than the expected changes (35%) induced by training or heat stress; however, minimum of 10 min exercise is recommended for more reliable measurements.
机构:
Liverpool John Moores Univ, Res Inst Sport & Exercise Sci, Liverpool L3 2ET, Merseyside, EnglandLiverpool John Moores Univ, Res Inst Sport & Exercise Sci, Liverpool L3 2ET, Merseyside, England
机构:
Free Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, NetherlandsFree Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, Netherlands
Bijker, KE
;
de Groot, G
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Free Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, NetherlandsFree Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, Netherlands
de Groot, G
;
Hollander, AP
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Free Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, NetherlandsFree Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, Netherlands
机构:
Liverpool John Moores Univ, Res Inst Sport & Exercise Sci, Liverpool L3 2ET, Merseyside, EnglandLiverpool John Moores Univ, Res Inst Sport & Exercise Sci, Liverpool L3 2ET, Merseyside, England
机构:
Free Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, NetherlandsFree Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, Netherlands
Bijker, KE
;
de Groot, G
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h-index: 0
机构:
Free Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, NetherlandsFree Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, Netherlands
de Groot, G
;
Hollander, AP
论文数: 0引用数: 0
h-index: 0
机构:
Free Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, NetherlandsFree Univ Amsterdam, Fac Human Movement Sci, Inst Fundamental & Clin Human Movement Sci, NL-1081 BT Amsterdam, Netherlands