Whole body passive heating versus dynamic lower body exercise: A comparison of peripheral hemodynamic profiles

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  • Sachin Amin
    University of Innsbruck
  • Alexander Hansen
    University of Innsbruck
  • Hendrik Mugele
    University of Innsbruck
  • Felix Willmer
    University of Innsbruck
  • Florian Gross
    University of Innsbruck
  • Benjamin Reimer
    University of Innsbruck
  • William Cornwell
    University of Colorado
  • Lydia Simpson
  • Jonathan Moore
  • Steven Romero
    University of North Texas
  • Justin Lawley
    University of Innsbruck
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 years) (5 female) underwent 30 minutes of whole body passive heating (42 °C bath), followed on a separate day by 30 minutes of semi-recumbent stepping exercise performed at two workloads corresponding to the increase in cardiac output (Qc) (Δ3.72 l∙min-1) and heart rate (HR) (Δ38 bpm) recorded at the end of passive heating. Results: At the same Qc (Δ3.72 l∙min-1 vs 3.78 l∙min-1), femoral artery blood flow (1599 ml/min vs 1947 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 HR matched intensity, femoral blood flow (1599 ml·min-1 vs 2588 ml·min-1) and shear rate (161s-1 vs 271s-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% VO2max), however exercise performed at a higher intensity (53% VO2max) results in significantly larger shear rates towards the active skeletal muscle.
Iaith wreiddiolSaesneg
Tudalennau (o-i)160-171
CyfnodolynJournal of Applied Physiology
Cyfrol130
Rhif y cyfnodolyn1
Dyddiad ar-lein cynnar22 Hyd 2020
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - Ion 2021

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