The purpose of this study was to compare sex-related responses to a self-paced all out high-intensity intermittent exercise (HIIE). 9 women and 10 men were submitted to a maximal incremental test (to determine maximum aerobic power - MAP and VO2peak), and an HIIE cycling (60x8s:12s, effort:pause). During the protocol the mean value of V̇O2 and heart rate for the entire exercise (VO2total and HRt...

PurposeDirect measurement of blood volume provides better assessment and guides management congestion in patients with heart failure (HF). The impact using surrogate measures from analysis (BVA) on cardiopulmonary responses to exercise HF is unknown.MethodsThis a prospective two-center study enrolling consecutive advanced who underwent test (CPET) invasive hemodynamic BVA. Total (TBV), red cell...

Using an asymmetric stochastic volatility model, this study investigates the day-of-the-week and holiday effects on returns of Bitcoin from 1 January 2013 to 31 August 2019; in context, we also discuss characteristics as a financial asset. The results estimation are threefold. First, finding shows small day-of-the week effect Saturday Sunday than rest week. Second, although examined active trad...

OBJECTIVES The aim of this work was to explore the physiological and perceptual limits to exercise in children with varying degrees of motor impairment, and the relationships to measures of health. DESIGN AND METHODS In a group comparison design, 35 boys aged 12-15 years completed the Movement ABC test for the assessment of motor impairment, followed by an incremental cycle ergometer test to ...

The typical core temperature (T(c)) profile displayed during heatstroke (HS) recovery consists of initial hypothermia followed by delayed hyperthermia. Anecdotal observations led to the conclusion that these T(c) responses represent thermoregulatory dysfunction as a result of brain damage. We hypothesized that these T(c) responses are mediated by a change in the temperature setpoint. T(c) (+/- ...

We propose that variations in fat and carbohydrate (CHO) oxidation by working muscle alter O(2) uptake (VO(2)) kinetics. This hypothesis provides two predictions: 1) the kinetics should comprise two exponential components, one fast and the other slow, and 2) their contribution should change with variations in fat and CHO oxidation, as predicted by steady-state respiratory exchange ratio (RER). ...

PURPOSE The physiological mechanisms for alterations in oxygen utilization ([Formula: see text]) and the energy cost of running (Cr ) during prolonged running are not completely understood, and could be linked with alterations in muscle and cerebral tissue oxygenation. METHODS Eight trained ultramarathon runners (three women; mean ± SD; age 37 ± 7 yr; maximum [Formula: see text] 60 ± 15 mL mi...

Orexin neurons in the hypothalamus regulate energy homeostasis by coordinating various physiological responses. Past studies have shown the role of the orexin peptide itself; however, orexin neurons contain not only orexin but also other neurotransmitters such as glutamate and dynorphin. In this study, we examined the physiological role of orexin neurons in feeding behavior and metabolism by ph...

Women use more fat during endurance exercise as evidenced by a lower respiratory exchange ratio (RER). The contribution of intramyocellular lipid (IMCL) to lipid oxidation during endurance exercise is controversial, and studies investigating sex differences in IMCL utilization have found conflicting results. We determined the effect of sex on net IMCL use during an endurance exercise bout using...