Nutrição e performance esportiva – Artigo 12
Low Vitamin D Levels Do Not Predict Hyperglycemia in Elderly Endurance Athletes (but in Controls)
Abstract
Background and AimRecent studies revealed a link between hypovitaminosis D3 and the risk for hyperglycemia.Further mechanistic and interventional investigations suggested a common reason for both conditions rather than a causal relationship. Exposure to sunlight is the most relevant source of vitamin D3 (25(OH)D), whereas adipose tissue is able to store relevant amounts
of the lipophilic vitamin. Since running/bicycling leads to increased out-door time and alters physiological ...
Nutrição e performance esportiva – Artigo 11
Fructose ingestion impairs expression of genes involved in skeletal muscle’s adaptive response to aerobic exercise
Abstract
Background: The inverse relationship between exercise capacity and its variation over time and both cardiovascular and all-cause mortality suggests the existence of an etiological nexus between cardiometabolic diseases and the molecular regulators of exercise capacity. Coordinated adaptive responses elicited by physical training enhance exercise performance and metabolic efficiency and possibly mediate the health benefits of physical exercise. In contrast, impaired ...
Nutrição e performance esportiva – Artigo 10
Evaluation of the effects of two doses of alpha glycerylphosphorylcholine on physical and psychomotor performance
Abstract
Background: Recent studies have suggested that alpha glycerylphosphorylcholine (A-GPC) may be an effective ergogenic aid. The present study was designed to assess the efficacy of two doses of A-GPC in comparison to placebo and caffeine for increasing countermovement jump performance, isometric strength, and psychomotor function. Methods: Forty-eight healthy, college aged males volunteered for the present study and underwent baseline assessment of countermovement jump ...
Nutrição e performance esportiva – Artigo 09
Effects of two pre-workout supplements on concentric and eccentric force production during lower body resistance exercise in males and females: a counterbalanced, double-blind, placebo-controlled trial
Abstract
Background: Pre-workout supplements purportedly enhance feelings of energy, reduce fatigue and improve exercise performance. The purpose of this study was to examine the performance effects of caffeinated and noncaffeinated multi-ingredient pre-workout supplements. Methods: In a counterbalanced, double-blind, placebo-controlled design, eccentric and concentric force production
dur...
Nutrição e performance esportiva – Artigo 08
Effects of Potassium Bicarbonate Supplements on Circulating microRNA Expression
Several studies suggest that neutralizing acid load in the diet with alkali had favorable effects on intermediate markers of musculoskeletal health. We examined whether alkali supplementation with potassium bicarbonate [(KHCO3); 81 mmol/d; n = 12] vs placebo (n = 12) for 84 days altered serum microRNAs, potential biomarkers associated with innumerable biological processes including bone and muscle metabolism. Serum microRNAs, urinary net acid excretion (UNAE), urinary N-telopeptide
(UNTX), urinary calcium (UCa), ...
Nutrição e performance esportiva – Artigo 07
Effects of acute carbohydrate ingestion on anaerobic exercise performance
Abstract
Background: Carbohydrate (CHO) supplementation during endurance exercises has been shown to increase performance, but there is limited research with CHO supplementation during strength and conditioning exercises. Therefore, the purpose of this study was to examine the effects of various levels of CHO ingestion during acute testing sessions requiring participants to complete a strength and conditioning program designed for collegiate athletes. Methods: Participants (n = 7) performed a series of exercises while ...
Nutrição e performance esportiva – Artigo 06
Effects of a pre-workout supplement on hyperemia following leg extension resistance exercise to failure with different resistance loads
Abstract Background: We sought to determine if a pre-workout supplement (PWS), containing multiple ingredients thought to enhance blood flow, increases hyperemia associated with resistance training compared to placebo (PBO). Given the potential interaction with training loads/time-under-tension, we evaluated the hyperemic response at two different loads to failure. Methods: Thirty males participated in this double-blinded study. At visit 1, participants were ...
Nutrição e performance esportiva – Artigo 05
Effect of protein and carbohydrate solutions on running performance and cognitive function in female recreational runners
Abstract
This study compared the effects of a carbohydrate–electrolyte–protein solution (CEPS, 2% protein plus 4% carbohydrate), carbohydrate–electrolyte solution (CES, 6% carbohydrate), and noncaloric sweetened placebo (PLA) on both 21-km running performance and cognitive function. Eleven female recreational endurance runners performed a 21-km time-trial running
on three occasions, separated by at least 28 days. In a randomized cross-over design, they ingested ...
