Hanne Lis Olesen

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Dynamic exercise enhances regional cerebral artery mean flow velocity. J. Appl. Physiol. 78(1): 12-16, 1995.--Anterior (ACA) and middle (MCA) cerebral artery mean flow velocities (Vmean) and pulsatility indexes were determined using transcranial Doppler in 14 subjects during dynamic exercise after assessment of the carbon dioxide reactivity for both(More)
This study examined whether accumulated oxygen deficit depends on treadmill grade during uphill running. Oxygen uptake was measured during steady-state submaximal running. By linear extrapolation at each grade, energy demand was estimated for short exhaustive runs. Oxygen deficit was the difference between this estimate and accumulated oxygen uptake. Six(More)
Anaerobic energy capacity was evaluated by maximal oxygen deficit (MOD) as well as by blood gas and muscle biopsy variables during short exhausting running in six recreational (RR) and eight competitive sprint and middle distance runners (SMDR). On 3 days runs to exhaustion were executed. Two runs were performed at a treadmill gradient of 15% at speeds(More)
1. We tested the hypotheses that the increase in mean arterial pressure with the application of external leg compression in man is (i) blocked with epidural anaesthesia, and (ii) dependent upon the level of external pressure applied, the quantity of leg muscle mass compressed and the vascular volume of the leg. Fourteen healthy subjects were fitted with an(More)
Sympathetic beta-adrenergic influences on cardiovascular responses to 50 degrees head-up tilt were evaluated with metoprolol (beta 1-blockade; 0.29 mg kg-1) and propranolol (beta 1 and beta 2-blockade; 0.28 mg kg-1) in eight males. A normotensive-tachycardic phase was followed by a hypotensive-bradycardic episode associated with presyncopal symptoms after(More)
Near-infrared spectrophotometry-determined cerebral (ScO2) and muscle oxygen saturations (SmO2) were followed in 15 volunteers during passive 50 degrees head-up-tilt-induced central hypovolaemia, and in nine volunteers during ventilatory manoeuvres affecting arterial carbon dioxide tension. During head-up tilt, mean arterial pressure [MAP, 88 (77-118) to 97(More)
We followed central, median cubital and dorsal metacarpal venous oxygen saturations (SvO2) during 50 degrees head-up tilt (anti-Trendelenburg's position) induced central hypovolaemia in eight males. Head-up tilt resulted in slight tachycardia of 101 (60-120) beats min-1 (median with range) and a stable mean arterial pressure (MAP) of 100 (88-114) mmHg.(More)
In eight subjects luminal diameter of the resting limb radial and dorsalis pedis arteries was determined by high-resolution ultrasound (20 MHz). This measurement was followed during rest and during 2 min of static handgrip or of one-leg knee extension at 30% of maximal voluntary contraction of another limb. Static exercise increased heart rate and mean(More)
A double-blind paired protocol was used to evaluate, in eight male volunteers, the effects of the endogenous opiate antagonist naloxone (NAL; 0.05 mg· kg−1) on cardiovascular responses to 50° head-up tilt-induced central hypovolaemia. Progressive central hypovolaemia was characterized by a phase of normotensive-tachycardia followed by an episode of(More)
During exercise the transcranial Doppler determined mean blood velocity (Vmean) increases in the middle cerebral artery (MCA) and reflects cerebral flood flow when the diameter at the site of investigation remains constant. Sympathetic activation could induce MCA vasoconstriction and in turn elevate Vmean at an unchanged cerebral blood flow. In 12(More)