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Apneic bradycardia : terrestrial and aquatic responses in man under working conditions

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dc.contributor.author Manley E en
dc.date.accessioned 2016-09-22T08:13:41Z
dc.date.available 2016-09-22T08:13:41Z
dc.date.submitted 1988 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/25789
dc.description.abstract The focus of this research was the reappraisal in physiological and psychophysical terms of current equivocal theories regarding the onset, course and termination of Apneic Bradycardia. Sixteen healthy male subjects participated in four separate testing sessions. Maximal oxygen consumption (v02 Max) was measured on land and underwater using an identical direct, continuous progressive cycle ergometer test. On each of two other occasions subjects exercised in either environment at 50, 70 and 90% of the appropriate v02 max, during which time heart rate was continuously recorded. An initial apneic bout at each exercise intensity was followed by performance of the same workload without apnea for an equivalent period of time. Ratings of perceived exertion (RPE) were also monitored. The findings are discussed. Twelve of the original 16 subjects were divided equally into two groups on the basis of vital capacity was measured during the first laboratory session. Neither the mean heart rate response to apneic exercise at 50% v02 max in both environments, nor the lowest heart rates recorded differed between groups, prompting the conclusion that lung volume did not affect Apneic Bradycardia. Despite a longer breath-hold duration for group a (large relative lung volume) than group b (small relative lung volume), the onset point of Bradycardia was the same for either group when expressed relative to total breath-hold duration. en
dc.language English en
dc.subject Medical sciences: Health promotion en
dc.subject Physical fitness and physiological aspects en
dc.title Apneic bradycardia : terrestrial and aquatic responses in man under working conditions en
dc.type Masters degree en
dc.description.degree MSc en


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