Results 111 to 120 of about 123,113 (271)
Entropy, 2019 In this study, the linear method of extended partial directed coherence (ePDC) was applied to establish the temporal dynamic behavior of cardiovascular and cardiorespiratory interactions during orthostatic stress at a 70° head-up tilt (HUT) test on ...
Sonia Charleston-Villalobos +9 more
doaj +1 more source
Experimental Physiology, EarlyView.Abstract Manned space exploration to distant destinations, including Mars, continues to be an aspiration of humankind. Space travel does, however, present many challenges to the body, amongst which adaptation to microgravity is perhaps the largest. For instance, both short and long manned spaceflight missions have shown substantial deleterious effects ...
Gerard McMahon +2 more
wiley +1 more source
Orthostatic intolerance and autonomic dysfunction following bariatric surgery: A retrospective study and review of the literature [PDF]
, 2016 The prevalence and costs of the obesity epidemic and obesity-related conditions, including diabetes mellitus, is consistently increasing worldwide.
Iodice, V +4 more
core +2 more sources
Experimental Physiology, EarlyView.Abstract Central artery stiffening increases the haemodynamic pulsations transmitted downstream towards target organs, including the brain. While recent evidence suggests that long duration spaceflight is associated with reduced common carotid artery (CCA) distensibility, cerebrovascular pulsatility has not been extensively characterized in astronauts.
Roxanne Fournier +5 more
wiley +1 more source
Effect of aerobic capacity on Lower Body Negative Pressure (LBNP) tolerance in females [PDF]
This investigation determined whether a relationship exists in females between: (1) aerobic capacity and Lower Body Negative Pressure (LBNP); and (2) aerobic capacity and change in LBNP tolerance induced by bed rest. Nine females, age 27-47 (34.6 plus or
Fortney, Suzanne M. +2 more
core +1 more source
Mechanisms of sympathetic regulation in orthostatic intolerance
Journal of Applied Physiology, 2012 Sympathetic circulatory control is key to the rapid cardiovascular adjustments that occur within seconds of standing upright (orthostasis) and which are required for bipedal stance. Indeed, patients with ineffective sympathetic adrenergic vasoconstriction rapidly develop orthostatic hypotension, prohibiting effective upright activities.
openaire +4 more sources
A27-1 Orthostatic intolerance syndromes. Hemodynamic, autonomic and neurohormonal behaviour in a ten-minute head-up tilt evaluation [PDF]
, 2003 João Freitas +5 more
openalex +3 more sources
CHRISMED Journal of Health and Research, 2019 Background: Postural orthostatic tachycardia syndrome (POTS) is an autonomic disorder characterized by the clinical symptoms of orthostatic intolerance such as light-headedness, fatigue, sweating, tremor, anxiety, palpitation, exercise intolerance, and ...
Neeraj +3 more
doaj +1 more source
Investigation of in vivo measurement of cerebral cytochrome-c-oxidase redox changes using near-infrared spectroscopy in patients with orthostatic hypotension [PDF]
, 2007 We have previously used a continuous four wavelength near infrared spectrometer to measure changes in the cerebral concentrations of oxy- (Δ[HbO2] and deoxy- haemoglobin (Δ[HHb]) during head-up tilt in patients with primary autonomic failure.
Cooper, C.E. +6 more
core
Integrative cardiovascular dose–response to graded lower‐body negative pressure
Experimental Physiology, EarlyView.ABSTRACT Lower‐body negative pressure (LBNP) has been posited as a potential spaceflight countermeasure to counteract the physiological deconditioning related to fluid shifts in microgravity. However, open questions remain regarding the magnitude of LBNP that should be applied.
Richard S. Whittle +5 more
wiley +1 more source