Medicine and science in sports and exercise
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Med Sci Sports Exerc · Apr 2000
Incidence of exercise-induced bronchospasm in Olympic winter sport athletes.
The purpose of this project was to determine the incidence of exercise-induced bronchospasm (EIB) among U.S. Olympic winter sport athletes. ⋯ These data suggest that: 1) EIB is prevalent in several Olympic winter sports and affects nearly one of every four elite winter sport athletes; 2) the winter sport with the highest incidence of EIB is cross-country skiing; 3) in general, EIB is more prevalent in female versus male elite winter sport athletes; and 4) athletes may compete successfully at the international level despite having EIB.
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Med Sci Sports Exerc · Mar 2000
Clinical TrialLong-term exercise adherence after intensive rehabilitation for chronic low back pain.
The purpose of this study was to examine exercise compliance in patients with chronic low back pain (CLBP) after participation in an intensive spine rehabilitation program. ⋯ It is concluded that exercise behaviors can be increased and maintained in CLBP patients without adversely affecting pain or function.
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Med Sci Sports Exerc · Mar 2000
Clinical Trial Controlled Clinical TrialPlasma catecholamine and blood lactate responses to incremental arm and leg exercise.
The present study was conducted to examine the pattern of plasma catecholamine and blood lactate responses to incremental arm and leg exercise. Seven untrained male subjects performed two incremental exercise tests on separate days in random order. One test consisted of 1-arm cranking (5W x 2 min(-1)), whereas the other exercise test was 2-leg cycling (20-25W x 2 min(-1)). Blood samples were obtained from the nonexercising arm during 1-arm cranking and from the same arm and vein during 2-leg cycling. Thresholds for blood lactate (T(La)), epinephrine (T(Epi)) and norepinephrine (T(NE)) were determined for each subject under both exercise conditions and defined as breakpoints when plotted as a function of power output. ⋯ The breakpoint in plasma [Epi] shifted in an identical manner and occurred simultaneously with that of T(La) regardless of the mode of exercise (arm or leg). The Epi concentrations observed at the T(La) agree with those previously reported to produce a rise in blood lactate during Epi infusion at rest. These results support the hypothesis that a rise in plasma [Epi] may contribute to the breakpoint in blood lactate that occurs during incremental exercise.
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The purpose of this paper is to assess the economic costs of inactivity (including those attributable to obesity). These costs represent one summary of the public health impact of increasingly sedentary populations in countries with established market economies. Components of the costs of illness include direct costs resulting from treatment of morbidity and indirect costs caused by lost productivity (work days lost) and forgone earnings caused by premature mortality. ⋯ Overall, the direct costs of inactivity and obesity account for some 9.4% of the national health care expenditures in the United States. Inactivity, with its wide range of health consequences, represents a major avoidable contribution to the costs of illness in the United States and other countries with modern lifestyles that have replaced physical labor with sedentary occupations and motorized transportation.
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Med Sci Sports Exerc · Oct 1999
ReviewRecognizing and treating common cold-induced injury in outdoor sports.
We briefly review the physiology of cold exposure, the spectrum and prevention of common cold-induced injuries (especially in athletes participating in outdoor sports), and the potentially harmful side effects of localized cryotherapy. Severe cold affects all organ systems and especially the central nervous and cardiovascular systems; many biochemical reactions and pathways become distorted or slowed at low body core temperatures and can thus affect athletic performance. Low body shell temperature, too, can interfere with athletic ability by weakening and slowing muscle contractions, by delaying nerve conduction time, and by facilitating injury. Cold-induced injuries may be local or systemic, but they can usually be prevented by knowledge, good physical condition, appropriate nutrition and equipment, and avoidance of moisture.