Search for dissertations about: "bedrest"

Found 5 swedish dissertations containing the word bedrest.

  2. 1. Distensibility in Arteries, Arterioles and Veins in Humans : Adaptation to Intermittent or Prolonged Change in Regional Intravascular Pressure

    Author : Roger Kölegård; Ola Eiken; Toste Länne; KTH; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; arterial stiffness; venous distensibility; venous flow characteristics; bedrest; pressure training; Physiology; Fysiologi;

    Abstract : The present series of in vivo experiments in healthy subjects, were performed to investigate wall stiffness in peripheral vessels and how this modality adapts to iterative increments or sustained reductions in local intravascular pressures. Vascular stiffness was measured as changes in arterial and venous diameters, and in arterial flow, during graded increments in distending pressures in the vasculature of an arm or a lower leg. READ MORE

  4. 2. Effects of unloading on skeletal muscle mass and function in man

    Author : Hans Berg; Karolinska Institutet; Karolinska Institutet; []
    Keywords : Atrophy; bedrest; concentric and isometric and eccentric muscle actions; disuse; electromyography; fatigue; fiber types and size; humans; inactivity; maximal voluntary force; recovery; skeletal muscle cross-sectional area; strength; suspension; tomog;

    Abstract : An experimental human model of skeletal muscle unloading of one lower limb and confined bedrest were employed to quantitate the adaptive responses to 10 days, 4 or 6 wk of unloading in healthy humans on quadricep skeletal muscle mass and function. Muscle cross-sectional area (CSA) was assessed using tomographic imaging (CT, MRI). READ MORE

  5. 3. Lumbar puncture in psychiatric research : on the impact of confounding factors on monoamine compounds in cerebrospinal fluid

    Author : Thomas Eklundh; Karolinska Institutet; Karolinska Institutet; []
    Keywords : cerebrospinal fluid; lumbar puncture; monoamine compounds; confounding factors; atmospheric pressure; pathological gambling;

    Abstract : Lumbar puncture has for many years been a tool for investigations of cerebrospinal fluid (CSF) in man. The method has been in use since 1891 and is common in neurology, and other medical specialities. READ MORE

  6. 4. Effects of physical activity and gravitational stress on cardiovascular control

    Author : Patrik Sundblad; Karolinska Institutet; Karolinska Institutet; []
    Keywords : leg exercise; posture; blood pressure; heart rate; cardiovascular model; heart function; stroke volume; tilting; orthostasis; simulated weightlessness; long-term hypokinesia;

    Abstract : The long-term goal of the present work was to characterize the responses to gravitational challenges in exercising humans after long-term head-down-tilt bedrest (HDT). HDT is a simulation of weightlessness with respect to effects on the systemic circulation, and previous studies in resting men have suggested that impairments of arterial baroreflexes contribute to the orthostatic intolerance seen after HDT and spaceflight. READ MORE

  7. 5. On the cerebrospinal fluid disposition and neurobiological role of cholecystokinin in man

    Author : Tove Gunnarsson; Conny Nordin; Erik Widerlöv; Linköpings universitet; []
    Keywords : MEDICINE; MEDICIN;

    Abstract : Cholecystokinin (CCK) is the most abundant neuropeptide in the brain, where it acts as a neurotransmitter and neuromodulator. The tetrapeptide CCK-4 and the octapeptide CCK-8 have been implicated in various behavioural and physiological functions, such as anxiety, pain and satiety. READ MORE