Medicine and science in sports and exercise
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Med Sci Sports Exerc · Dec 1987
Exercise intensity-related responses of beta-endorphin and catecholamines.
Ten men and 10 women exercised on a bicycle ergometer for 20 min at 40, 60, and 80% maximal oxygen uptake (VO2max) to determine the relationship between plasma beta-endorphin, catecholamines, and exercise intensity. Compared to rest, plasma beta-endorphins were not significantly elevated during the 40 and 60% workloads (4.8 +/- 1.0 pmol.l-1 vs 3.8 +/- 0.7 and 6.3 +/- 0.9, respectively). In contrast, the 80% exercise significantly elevated endorphins to 16.1 +/- 4.0 pmol.l-1. ⋯ The low correlation suggests a weak relationship between beta-endorphin and catecholamine responses during exercise. The results of this investigation suggest that the relationship between beta-endorphin and exercise intensity is curvilinear, with anaerobic activity producing the most significant endorphin response. It was also noted that the beta-endorphin response was not related to gender, but the amine response to exercise was gender-related, being greater for the men.
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Med Sci Sports Exerc · Feb 1985
Current concepts in the diagnosis and treatment of hand and wrist injuries in sports.
The hand is the most commonly injured part in sport. Fortunately, most injuries are minor and do not interfere with the sport participation, but even these leave residual functional deficits that may increase with time. ⋯ A program is herein described outlining the care of minor and major sports injuries to the hand that tries to return the injured player quickly to the sport participation while not jeopardizing the future. Because injuries to this most important tool are so frequent, it is recommended that a lecture be given to each sport group prior to the season to describe and raise the awareness of the players regarding hand and finger injury.
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Med Sci Sports Exerc · Aug 1984
ReviewCurrent concepts in the diagnosis and treatment of musculotendinous injuries.
A strain, by definition, is a stretching or tearing of a musculotendinous unit. The degree of disability associated with this injury is dictated by the location and severity of the injury and the specific needs of the patient. A strain can be arbitrarily classified as first, second, or third degree. ⋯ Initial treatment following an acute strain should consist of the use of ice, immobilization of the musculotendinous unit, and subsequent rehabilitation. Depending on the degree of disability and the specific structure injured, surgery may be indicated. Rehabilitation to a normal state following the initial healing phase is required prior to return to athletic competition.
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Med Sci Sports Exerc · Jan 1983
Time course of lung volume changes during prolonged treadmill exercise.
It has been known since the 1920s that runners completing marathon races have reduced forced vital capacity (FVC) values. To investigate the time course of these lung volume alterations, we measured FVC and residual volume (RV) in 11 runners before, after, and at 30-min intervals during a 2.5-h treadmill run at just under their marathon pace (70% VO2max). Mean distance run was 21.5 +/- 1.5 (SD) miles in the 2.5-h period. ⋯ From 90-150 min, lung volumes changed in a direction similar to that observed after a marathon, i.e., FVC decreased significantly (5.51 to 5.37 liter between 90 and 150 min, P less than 0.05), TLC remained unchanged (7.41 vs 7.42 liter, P greater than 0.05), and RV showed a nonsignificant increase from 1.90 to 2.05 liter (P greater than 0.05). The data are consistent with multiple mechanisms playing a role in pulmonary function changes during prolonged exercise. The smaller mean decrease in FVC observed in this study, as compared to that found during a marathon, suggested that the marathon imposes a greater demand on the lungs than did treadmill exercise of the duration and relative intensity used in this study.