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dc.contributor.advisor Wallace, Janet P en_US Park, Saejong en_US 2010-05-24T15:09:50Z 2027-01-24T16:09:50Z 2012-03-07T02:04:21Z 2010-05-24T15:09:50Z 2006 en_US
dc.description Thesis (PhD) - Indiana University, School of Health, Physical Education and Recreation, 2006 en_US
dc.description.abstract Despite limited research, the accumulation of physical activity has been recommended for the treatment of prehypertension. The purpose of this study was 1) to compare the duration and magnitude of blood pressure (BP) reduction following the accumulation of physical activity (PAaccum) vs. a single continuous physical activity session (PAcont), 2) to investigate the BP response during the rest periods between short sessions within the PAaccum, and 3) to investigate sympathetic modulation (SM) as a possible mechanism for BP reduction in prehypertension. Procedures include 1) BP screening, 2) maximal graded exercise test, 3) treatments (PAaccum, 4x10-min walk at 50% VO2peak; PAcont, 40-min walk at 50% VO2peak; and control), and 4) 12-hr ambulatory BP, and SM measurements via heart rate variability. In this randomized within-subjects design, 20 prehypertensive completed the study. Systolic (S) BP was reduced -5.4+1.7 mm Hg for 11 hrs following PAaccum and -5.6+1.6 mmHg for 7 hrs following PAcont. Diastolic (D) BP was reduced -3.4+1.3 mmHg for 10 hrs following PAaccum and -3.1+1.3 mmHg for 7 hrs following PAcont. In PAaccum, the change in sympathetic modulation was correlated with both SBP and DBP reductions. In PAcont, the change in sympathetic modulation was correlated with DBP reduction. SBP was decreased following the third short session within the PAaccum compared to the baseline. No significance was found in either DBP or SM during the rest periods between short sessions. In conclusion, the accumulation of PA appears more effective than a continuous session in the management of prehypertension. There is an additive effect of successive short sessions within the accumulation of physical activity on blood pressure reduction. Sympathetic modulation was associated with BP reduction following each PA treatment. en_US
dc.language.iso EN en_US
dc.publisher [Bloomington, Ind.] : Indiana University en_US
dc.subject Fractionization of Exercise en_US
dc.subject Post-exercise Hypotension en_US
dc.subject Heart Rate Variability en_US
dc.subject Ambulatory Blood Pressure en_US
dc.subject.classification Health Sciences, Rehabilitation and Therapy (0382) en_US
dc.subject.classification Health Sciences, Medicine and Surgery (0564) en_US
dc.subject.classification Health Sciences, General (0566) en_US
dc.title Blood Pressure Reduction Following The Accumulaton Of Short Physical Activity Sessions Versus A Continuous Physical Activity Session In Prehypertension en_US
dc.type Doctoral Dissertation en_US

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