View clinical trials related to Energy Metabolism.
Filter by:The goal of this clinical trial is to test whether changes in lactate kinetics during exercise (due to glycogen depletion or hyperthermia) alter the pattern of fat oxidation during a maximal incremental cycle ergometer test in healthy young active people. The main questions it aims to answer are: - Will a rightward shift in lactate kinetics, induced by a previous glycogen depletion, produce a rightward shift in fat oxidation? - Will a leftward shift in lactate kinetics due to an increase in ambient temperature produce a leftward shift in fat oxidation? Participants will perform three maximal incremental tests in three different conditions: - one in the control condition; - one with glycogen depletion; - and one with ambient heat (the latter two in randomized, counterbalanced order).
Regular physical activity (PA) is proven to help prevent and treat several non-communicable diseases such as heart disease, stroke, and diabetes. Intensity is a key characteristic of PA that can be assessed by estimating energy expenditure (EE). However, the accuracy of the estimation of EE based on accelerometers are lacking. It has been suggested that the addition of physiological signals can improve the estimation. How much each signal can add to the explained variation and how they can improve the estimation is still unclear. The goal of the current study is twofold: to explore the contribution of heart rate (HR), breathing rate (BR) and skin temperature to the estimation of EE develop and validate a statistical model to estimate EE in simulated free-living conditions based on the relevant physiological signals.
Iron deficiency is the most prevalent nutritional deficiency worldwide with one in four estimated to be affected by iron deficiency anaemia. Women of reproductive age are at greatest risk for iron deficiency and anaemia due to iron losses during menstruation and childbirth as well as the increased need for iron throughout pregnancy. However, iron deficiency without anaemia is at least twice as common as iron deficiency anaemia with females aged 11-49 at the biggest risk of all. Despite this, it is commonly left undiagnosed. Those who are iron deficient non-anaemic can still suffer from the same common consequences of iron deficiency anaemia; these include unexplained fatigue, mood changes and decreased cognitive performance. It is postulated that for any cognitive and behavioural change to occur, a complementary change in neural functioning is required. A recent cross-sectional study has identified increases in cognitive demand to produce decrements in measures of cognitive performance and increases in brain activity and metabolic measures; the magnitude of such are evidenced to be directly related to iron status. However, such measures do not provide an estimate of overall oxygen consumption that is specific to the brain in order to be able to associate changes in cognitive performance and energy expenditure specifically to the brain itself. The current study aims to investigate the parallel effects of iron supplementation on cerebral haemodynamics and energy metabolism to determine the ability of iron to modulate whole body energy metabolism and utilisation of metabolic substrates at rest and during cognitive demand in a sample of non-anaemic iron deficient and iron sufficient women of reproductive age.
Maximal fat oxidation during exercise (MFO) and the intensity of exercise that elicits MFO (Fatmax) has been recognized as potential determinants of endurance performance. The purpose of this study was to determine the possible interaction between the effects of diurnal variation (morning vs. afternoon) and caffeine ingestion on MFO, Fatmax and VO2 max in endurance-trained men. Specifically, the investigators sought to elucidate whether the stimulant actions of caffeine could reverse the decrements of MFO and Fatmax observed in the morning.
Lower extremity amputation causes rapid changes in musculoskeletal system. With the effect of these changes, the energy requirement for prosthetic ambulance is much higher than normal ambulance. Although methods such as the reduction of the segmental load of the prosthesis and the preference of the different prosthetic components for energy expenditure have been emphasized, the effect of exercise types has not been investigated in our knowledge. Therefore, the aim of the current study is to investigate the effect of spinal (Core) stabilization exercises on energy expenditure in combination with the classical physiotherapy program in patients with unilateral transtibial amputation. Individuals with transtibial amputation included in the study will be randomly divided into two groups. In group 1, basic exercises related to amputation will be applied for 8 weeks and in group 2 basic exercises with spinal stabilization exercises will be applied to the individuals. At the beginning and at the end of the exercise intervention, energy expenditure and exercise capacity will be evaluated by a portable exercise test device during '6 Minutes Step Test'; fatigue assessment will be done before and after 6 Minutes Step Test with 'Modified Borg Scale'; the strength of deep spinal muscles will be evaluated with 'Stabilizer'; dynamic balance and functional mobility will be evaluated by 'Timed Up & Go' Test; and the effect of the prosthesis on mobility will be evaluated by the sub-scale 'Mobility' of 'Prosthetic Evaluation Questionnaire'.
The three primary goals of this pilot will be followed by a secondary goal to test if dental intervention improves brain health in terms of sleep and cognition. The primary and secondary goals are 1. Explore the ratios of brain energy (ATP/PCr, Pi/PCr) and phospholipids (PME/PDE) metabolites as measured by magnetic resonance spectroscopy at 7 Tesla, and compare the differences in them with the performance of episodic memory, attention, language, and executive functions (abstraction, reasoning, verbal fluency, working memory) in three groups: cognitively normal adults, mild cognitive impairment (MCI) and Alzheimer's disease (AD). 2. Investigate the differences in sleep patterns measured by the ratio sleep quality index (Stable/ Unstable sleep) in cognitively normal adults, MCI and AD and its relation to the performance of episodic memory, attention, language, and executive functions (abstraction, reasoning, verbal fluency, working memory) in three groups. 3. Investigate the differences in the variations of two genes, APOE-E4 and ABCA7, in relationship to the changes in the brain energy metabolites and its relation to the performance of episodic memory, attention, language, and executive functions (abstraction, reasoning, verbal fluency, working memory) in those with cognitively normal adults, MCI and AD. 4. Investigate if dental intervention improves sleep patterns and overall cognitive behavior in the three cohorts.
Energy metabolism and insulin sensitivity were assessed in a case-control study in patients with branched-chain organic acidemias.
This study will explore differences in energy metabolism and metabolic flexibility under various conditions in older men and women.
This a randomized, double blind, placebo controlled, crossover design study which measures the effect of an available thermogenic dietary supplement on resting energy expenditure (REE), blood pressure and heart rate, and mood changes in moderate caffeine consumers. Participants will complete baseline measurements then ingest one of three pills. Once the pill is ingested, subjects will complete four REEs along with heart rate and blood pressure and appropriate questionnaires. Participants will return two more times, each after a one week washout period, and complete the same protocol with the remaining supplements.
We aim to examine energy metabolism in patients with pulmonary MAC and clarify the causes of emaciation. We will also investigate the following: the relation between energy metabolism and degree of pulmonary MAC progression; relations among hospitalization, mortality rate, and time-course of changes in energy metabolism; and factors that affect energy metabolism.