View clinical trials related to Healthy Young.
Filter by:Cardiovascular disease is the main cause of death worldwide. Endothelial dysfunction is the first step to development of cardiovascular diseases. Endothelial dysfunction occurs due to reduction in nitric oxide, a molecule that plays an important role on vascular health. Due to important role of nitric oxide in endothelial function, several studies have evaluated the effect of its precursors, such as L-citrulline and nitrate on endothelial function parameters. The present study will evaluate the effect of L-citrulline and nitrate derived by watermelon and beetroot products, respectively, on endothelial function of young and older participants. Furthermore, we will evaluate the plasmatic amino acids, nitrate, glucose and insulin in response to ingestion of these products.
Low frequency pulsed current (PC) and medium frequency alternating current (Russian current - RC, 2.5 kHz) have been largely studied due to their clinical use. However, it is not clear which current is the most efficient due to the existente literature conflicts.Therefore, the purpose of this study is to compare the neuromuscular efficiency, evoked torque, current intensity, fatigability and level of discomfort between the PC and the RC in healthy young. The current types will be tested in the same participant by the intervention sequences randomization. On the first, second, third and fourth days, the maximum voluntary isometric contraction (MVIC), the current intensity level, discomfort level, evoked torque, and clinical and neuromuscular efficiency of each current will be evaluated. Anthropometric measurements will also be assessed on the first day. In addition, the current intensity required to produce a torque level of 20% of the MVIC, the current intensity required to generate a torque of 40 Nm and the maximum intensity tolerated by the participant will be evaluated. Three contractions will be recorded in each condition, and the level of discomfort will be assessed during the evoked contractions. Evoked torque will be evaluated at the maximum tolerated intensity level using the isokinetic dynamometer. Clinical and neuromuscular efficiency will be evaluated (1) at the current intensity necessary to evoke 20% MVIC, (2) at the current intensity necessary to generate 40 Nm, and (3) at the maximum tolerated current intensity. On the fifth and sixth days, muscle fatigue induced by the diferente current types will be evaluated. Fatigue will be evaluated with sufficient current intensity to generate 20% of the MVIC. MVIC will be performed before and after the fatigue protocol, and the fatigue will be determined by the relative variation of the MVIC before and after the fatigue protocol. Fatigue will also be evaluated through the evoked torque variation between the first and the last minute of the fatigue protocol, as well as by the total work generated in each protocol. Neuromuscular efficiency will be evaluated before and immediately after the protocol through (1) the ratio between input NMES current intensity and output evoked torque, (2) total work (area under the evoked force by time curves) generated during the fatigue protocol, and (3) by the changes in muscle architecture from rest to evoked contraction at the maximal current intensity.
To understand the effects of a novel dietary supplement when used in conjunction with a healthy lifestyle exercise program and to define biomarkers that are specific to sarcopenia. A primary aim in the present study is to determine whether a relationship exists between positive changes in body composition through increases in lean mass and reductions in body fat following oral supplementation of naturally occurring food components in combination with exercise. The purpose of the present study is to examine the effects of a multi-nutrient supplement in combination with an endurance and resistance based exercise intervention in a cohort of older adult men with varying degrees of sarcopenia as compared to younger male controls (McMaster/CIHR/Exerkine project). A sub-purpose nested within the study is to provide serum and muscle samples for use in an aging/sarcopenia biomarker discovery study taken at pre-intervention for the young and older men (Buck Institute/Astellas project).
Epidemiological studies suggest that the consumption of (poly)phenols rich foods such as cocoa, tea, fruits and vegetables is associated with lower blood pressure, reduced cholesterol and decreased cardiovascular risk. Cranberries are a rich source of (poly)phenols, including anthocyanins, proanthocyanidins and phenolic acids. Whether cranberries can improve vascular function when given over relevant time periods and in relevant populations is not known. Therefore, it is the overall hypothesis of the study proposal that chronic consumption of cranberries can improve endothelial function, a prognostically validated surrogate of cardiovascular risk. This study also aims to reveal which cranberry (poly)phenols have bioactive properties in healthy men. Consequently, plasma and urine metabolite peaks will be correlated with vascular outcomes and genome-wide expression microarrays will be performed to reveal cell signaling pathways associated with cranberry (poly)phenol-mediated cardioprotective events.