TY - JOUR
T1 - Whole body passive heating versus dynamic lower body exercise
T2 - A comparison of peripheral hemodynamic profiles
AU - Amin, Sachin B.
AU - Hansen, Alexander B.
AU - Mugele, Hendrik
AU - Willmer, Felix
AU - Gross, Florian
AU - Reimeir, Benjamin
AU - Cornwell, William K.
AU - Simpson, Lydia L.
AU - Moore, Jonathan P.
AU - Romero, Steven A.
AU - Lawley, Justin S.
N1 - Funding Information:
This study was supported by grants provided by the University of Innsbruck.
Publisher Copyright:
© 2021 American Physiological Society. All rights reserved.
PY - 2021/1
Y1 - 2021/1
N2 - Passive heating has emerged as a therapeutic intervention for the treatment and prevention of cardiovascular disease. Like exercise, heating increases peripheral artery blood flow and shear rate, which is thought to be a primary mechanism underpinning endothelium-mediated vascular adaptation. However, few studies have compared the increase in arterial blood flow and shear rate between dynamic exercise and passive heating. In a fixed crossover design study, 15 moderately trained healthy participants (25.6 ± 3.4 yr) (5 female) underwent 30 min of whole body passive heating (42°C bath), followed on a separate day by 30 min of semi-recumbent stepping exercise performed at two workloads corresponding to the increase in cardiac output (Qc) (D3.72 L min-1) and heart rate (HR) (D40 beats/min) recorded at the end of passive heating. At the same Qc (D3.72 L min-1 vs. 3.78 L min-1), femoral artery blood flow (1,599 mL/min vs. 1,947 mL/min) (P = 0.596) and shear rate (162 s-1 vs. 192 s-1) (P = 0.471) measured by ultrasonography were similar between passive heating and stepping exercise. However, for the same HRMATCHED intensity, femoral blood flow (1,599 mL min-1 vs. 2,588 mL min-1) and shear rate (161 s-1 vs. 271 s-1) were significantly greater during exercise, compared with heating (both P = <0.001). The results indicate that, for moderately trained individuals, passive heating increases common femoral artery blood flow and shear rate similar to low-intensity continuous dynamic exercise (29% V O2max); however, exercise performed at a higher intensity (53% V O2max) results in significantly larger shear rates toward the active skeletal muscle.
AB - Passive heating has emerged as a therapeutic intervention for the treatment and prevention of cardiovascular disease. Like exercise, heating increases peripheral artery blood flow and shear rate, which is thought to be a primary mechanism underpinning endothelium-mediated vascular adaptation. However, few studies have compared the increase in arterial blood flow and shear rate between dynamic exercise and passive heating. In a fixed crossover design study, 15 moderately trained healthy participants (25.6 ± 3.4 yr) (5 female) underwent 30 min of whole body passive heating (42°C bath), followed on a separate day by 30 min of semi-recumbent stepping exercise performed at two workloads corresponding to the increase in cardiac output (Qc) (D3.72 L min-1) and heart rate (HR) (D40 beats/min) recorded at the end of passive heating. At the same Qc (D3.72 L min-1 vs. 3.78 L min-1), femoral artery blood flow (1,599 mL/min vs. 1,947 mL/min) (P = 0.596) and shear rate (162 s-1 vs. 192 s-1) (P = 0.471) measured by ultrasonography were similar between passive heating and stepping exercise. However, for the same HRMATCHED intensity, femoral blood flow (1,599 mL min-1 vs. 2,588 mL min-1) and shear rate (161 s-1 vs. 271 s-1) were significantly greater during exercise, compared with heating (both P = <0.001). The results indicate that, for moderately trained individuals, passive heating increases common femoral artery blood flow and shear rate similar to low-intensity continuous dynamic exercise (29% V O2max); however, exercise performed at a higher intensity (53% V O2max) results in significantly larger shear rates toward the active skeletal muscle.
KW - Dynamic exercise
KW - Leg blood flow
KW - Passive heating
KW - Shear rate
KW - Ultrasound
UR - http://www.scopus.com/inward/record.url?scp=85100069654&partnerID=8YFLogxK
U2 - 10.1152/JAPPLPHYSIOL.00291.2020
DO - 10.1152/JAPPLPHYSIOL.00291.2020
M3 - Article
C2 - 33090910
AN - SCOPUS:85100069654
SN - 8750-7587
VL - 130
SP - 160
EP - 171
JO - Journal of Applied Physiology
JF - Journal of Applied Physiology
IS - 1
ER -