Medicine and science in sports and exercise
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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.