This study was undertaken to measure the response of stretch-activated ion channels (SAC) and transcript levels of the oncogene c-fos to separate bouts of eccentric contractions (EC). It was hypothesized that SAC in rat skeletal muscle would contribute to resting membrane potential depolarization after separate repeated bouts of EC. Blockage of SAC during an EC training regime also tested the n...

Investigations examining the ergogenic and metabolic influence of caffeine during short-term high-intensity exercise are few in number and have produced inconsistent results. This study examined the effects of caffeine on repeated bouts of high-intensity exercise in recreationally active men. Subjects (n = 9) completed four 30-s Wingate (WG) sprints with 4 min of rest between each exercise bout...

This study was performed to determine the effect of forced swimming on the vascular responsiveness of the rat superior mesenteric artery to phenylephrine, focusing on the involvement of locally produced substances. Repeated but not single sessions of forced swimming exercise reduced the vasoconstrictor potency of phenylephrine in the studied arteries, regardless of the presence of intact endoth...

This study tested the hypothesis that the first exercise bout consisting of slow-velocity (30° · s(-1)) maximal lengthening contractions would not affect muscle damage in a subsequent bout consisting of fast-velocity (210° · s(-1)) lengthening contractions. Eighteen men were randomly assigned into either a repeated bout group (n = 10) or control group (n = 8). The repeated bout group performed ...

Swimming performance tests of fish have been integral to studies of muscle energetics, swimming mechanics, gas exchange, cardiac physiology, disease, pollution, hypoxia and temperature. This paper describes a flexible protocol to assess fish swimming performance using equipment in which water velocity can be controlled. The protocol involves one to several stepped increases in flow speed that a...

Background and Objectives: Given the limited number of studies on Ramadan fasting and military performance, we conducted this study to identify the effect of Ramadan fasting on physical fitness performances in army cadets. Methods: Twenty healthy males were randomly selected from a larger sample group. The subjects were divided into fasting (n=10) and non-fasting (n=10) groups. They performed v...

Performance in intense exercise events, such as Olympic rowing, swimming, kayak, track running and track cycling events, involves energy contribution from aerobic and anaerobic sources. As aerobic energy supply dominates the total energy requirements after ∼75s of near maximal effort, and has the greatest potential for improvement with training, the majority of training for these events is gene...

BUFORD, B. N., and A. J. KOCH. Glycine-Arginine-Ketoisocaproic Acid Improves Performance of Repeated Cycling Sprints. Med. Sci. Sports Exerc., Vol. 36, No. 4, pp. 583–587, 2004. Purpose: The purpose of this study was to determine the effect of glycine-arginine-ketoisocaproic acid (GAKIC) supplementation on repeated bouts of anaerobic cycling performance. Methods: Ten men completed a randomized,...

SYNOPSIS. The within-swim pattern of cycle periods in Tritonia swimming changed when the behavior was repeatedly elicited suggesting that an excitatory process reaches a ceiling or wanes over repeated trials. Exposure to subthreshold stimuli enhanced swimming in response to a subsequent super-threshold stimulus, perhaps using a similar excitatory process. In reduced preparations, subthreshold s...