摘要:

ObjectiveTo investigate the effect of an acute oral administration of pseudoephedrine (PSE) on muscle function, fatigue, and anaerobic power output.Design and MaterialsHealthy males (N = 10) and females (N = 10) were allocated to receive both a placebo and PSE (120 mg) using a randomized, double-blind, crossover experimental design. Each subject had their maximal voluntary contraction strength and fatigability measured for both handgrip and ankle dorsi-flexion. Following the strength measurements, a 30-second maximal cycle test was performed to determine lower extremity anaerobic power and fatigue. Plasma lactate was measured before and after exercise.ResultsThere were no significant differences in any of the outcome variables between the placebo and PSE trials.ConclusionsThese results demonstrated that a 120 mg dose of PSE did not enhance force production, time to fatigue, fatigue index, or power output in young men or women. Therefore, there does not appear to be an ergogenic benefit from the ingestion of 120 mg PSE in high-intensity exercise performance.

ISSN:1050-642X    

出版商:OVID    

年代:2002

数据来源: OVID

摘要:

ObjectiveTo establish relationships between body weight changes and serum sodium during and after an Ironman Triathlon, and postrace fluid status and rectal temperature, including the incidence of hyponatremia.DesignDescriptive research.SettingThe 2000 South African Ironman Triathlon, in which each athlete swam 3.8 km, cycled 180 km, and ran 42.2 km.ParticipantsAll entrants in the race were invited to participate in the study.MethodsAthletes were weighed at registration, immediately prerace, immediately postrace, and 12 hours later. Blood samples were drawn at registration and immediately postrace. Rectal temperatures were measured postrace.ResultsStarting body weight was significantly related to total finishing time (r= 0.27) and to cycling (r= 0.20) and running (r= 0.28) time. Body weight decreased significantly (p < 0.0001) during the race and had not returned to prerace values 12 hours later (p < 0.0001). Percentage change in body weight was unrelated to postrace rectal temperatures and inversely related to the postrace serum sodium concentrations (r= −0.45). Postrace serum sodium concentrations fell within a normal distribution (141.8 ± 3.1 mmol.L−1, mean ± SD) and were negatively correlated to overall triathlon time (r= −0.22). Three sodium values (0.6%) were below 135 mmol.L−1. Percentage change in body weight was unrelated to time in the marathon leg.ConclusionsPercentage change in body weight was linearly related to postrace serum sodium concentrations but unrelated to postrace rectal temperature or performance in the marathon. There was no evidence that in this study, more severe levels of weight loss or dehydration were related to either higher body temperatures or impaired performance.

ISSN:1050-642X    

出版商:OVID    

年代:2002

数据来源: OVID

ISSN:1050-642X    

出版商:OVID    

年代:2002

数据来源: OVID

ISSN:1050-642X    

出版商:OVID    

年代:2002

数据来源: OVID

ISSN:1050-642X    

出版商:OVID    

年代:2002

数据来源: OVID

ISSN:1050-642X    

出版商:OVID    

年代:2002

数据来源: OVID

ISSN:1050-642X    

出版商:OVID    

年代:2002

数据来源: OVID