Medicine and science in sports and exercise
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Med Sci Sports Exerc · Aug 2007
Randomized Controlled TrialHyperventilation before resistance exercise: cerebral hemodynamics and orthostasis.
Hyperventilation performed by athletes during preparation for resistance exercise might contribute to reports of postexercise orthostatic instability. ⋯ Hyperventilation before lower-body resistance exercise exacerbates CBFV(MEAN) reductions during standing. Increased symptoms of orthostatic instability are associated with the magnitude of reductions in both MAP and CBFV(MEAN).
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Med Sci Sports Exerc · Jul 2007
Temporal thermometry fails to track body core temperature during heat stress.
The aim of this study was to assess the accuracy of temporal scanning thermometry in monitoring internal temperature increases during passive heating. ⋯ These results demonstrate that temporal scanning does not track internal temperature, as measured via intestinal temperature, during passive heating. Given these findings, it is recommended that this technique not be used to assess temperature in hyperthermic diaphoretic subjects.
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Med Sci Sports Exerc · Jun 2007
Comparative StudyPeak cardiorespiratory responses during aquatic and land treadmill exercise.
Aquatic treadmill exercise has traditionally been used for aerobic training during rehabilitation; however, its ability to elicit comparable cardiorespiratory stress compared with land exercise is unclear. The purpose of this study was to investigate the cardiorespiratory (CR) responses elicited during maximal-effort protocols using an aquatic treadmill (ATM) and a land treadmill (TM). ⋯ Despite differences in VE and f, it seems that the fluid resistance created by water and jets in an ATM elicits peak CR responses comparable with those seen with inclined TM. These findings suggest that ATM running may be as effective as TM running for aerobic conditioning in fit individuals.
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Med Sci Sports Exerc · Jun 2007
Recurrent concussion and risk of depression in retired professional football players.
The purpose of our study was to investigate the association between prior head injury and the likelihood of being diagnosed with clinical depression among retired professional football players with prior head injury exposure. ⋯ Our findings suggest a possible link between recurrent sport-related concussion and increased risk of clinical depression. The findings emphasize the importance of understanding potential neurological consequences of recurrent concussion.
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Med Sci Sports Exerc · Apr 2007
Randomized Controlled TrialHeart rate variability as a predictor of negative mood symptoms induced by exercise withdrawal.
Negative mood symptoms occur frequently in sedentary populations, but individual vulnerability factors for developing these complaints have not been systematically evaluated. This investigation examined whether the autonomic nervous system (ANS) serves a role in the development of negative mood after controlled exercise withdrawal. ⋯ Reduced parasympathetic ANS activity as measured by HRV is predictive of the development of negative mood after deprivation of usual exercise activities. No significant changes in HRV were observed during the 2-wk exercise deprivation period. These findings are relevant to the understanding of mood changes in response to short-term exercise withdrawal, such as sports injuries and recovery from medical procedures.