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Central and peripheral hemodynamics in exercising humans: leg vs arm exercise

Calbet, J. A. L. ; González-Alonso, J. ; Helge, J. W. ; Søndergaard, H. ; Munch-Andersen, T. ; Saltin, B. ; Boushel, R.

Scandinavian journal of medicine & science in sports, 2015-12, Vol.25 (S4), p.144-157 [Periódico revisado por pares]

Denmark: Blackwell Publishing Ltd

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Título:
Central and peripheral hemodynamics in exercising humans: leg vs arm exercise
Autor: Calbet, J. A. L. ; González-Alonso, J. ; Helge, J. W. ; Søndergaard, H. ; Munch-Andersen, T. ; Saltin, B. ; Boushel, R.
Assuntos: Adult ; Arm - blood supply ; Arm - physiology ; arm cranking ; arterial blood pressure ; Arterial Pressure ; Blood pressure ; Cardiac output ; Exercise ; Exercise - physiology ; Exercise Test ; fatigue ; Heart - physiology ; Hemodynamics ; Humans ; Leg - blood supply ; Leg - physiology ; Male ; Middle Aged ; Muscle, Skeletal - blood supply ; Muscle, Skeletal - physiology ; Oxygen - blood ; oxygen extraction ; perfor-mance ; Physical Exertion - physiology ; Regional Blood Flow ; Sports medicine ; Stroke Volume ; Vascular Resistance ; VO 2max ; VO2max ; Young Adult
É parte de: Scandinavian journal of medicine & science in sports, 2015-12, Vol.25 (S4), p.144-157
Notas: Danish National Research Foundation - No. 504-14
Hans Jensen at Hotel Qaanaaq
ark:/67375/WNG-9LWW3KGP-C
Hunter Society in Qaanaaq
ArticleID:SMS12604
Natural Science and Engineering Research Council of Canada (NSERC)
istex:CFC7BFB28C14E7AE2617FEA82951043930ADD7C8
John and Birthe Meyer Foundation
ObjectType-Article-1
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content type line 23
Descrição: In humans, arm exercise is known to elicit larger increases in arterial blood pressure (BP) than leg exercise. However, the precise regulation of regional vascular conductances (VC) for the distribution of cardiac output with exercise intensity remains unknown. Hemodynamic responses were assessed during incremental upright arm cranking (AC) and leg pedalling (LP) to exhaustion (Wmax) in nine males. Systemic VC, peak cardiac output (Qpeak) (indocyanine green) and stroke volume (SV) were 18%, 23%, and 20% lower during AC than LP. The mean BP, the rate‐pressure product and the associated myocardial oxygen demand were 22%, 12%, and 14% higher, respectively, during maximal AC than LP. Trunk VC was reduced to similar values at Wmax. At Wmax, muscle mass‐normalized VC and fractional O2 extraction were lower in the arm than the leg muscles. However, this was compensated for during AC by raising perfusion pressure to increase O2 delivery, allowing a similar peak VO2 per kg of muscle mass in both extremities. In summary, despite a lower Qpeak during arm cranking the cardiovascular strain is much higher than during leg pedalling. The adjustments of regional conductances during incremental exercise to exhaustion depend mostly on the relative intensity of exercise and are limb‐specific.
Editor: Denmark: Blackwell Publishing Ltd
Idioma: Inglês

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Central and peripheral hemodynamics in exercising humans: leg vs arm exercise

Calbet, J. A. L. ; González-Alonso, J. ; Helge, J. W. ; Søndergaard, H. ; Munch-Andersen, T. ; Saltin, B. ; Boushel, R.

Denmark: Blackwell Publishing Ltd

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