The effects of acute aerobic exercise on cardiovascular reactivity to stress in healthy, trained and untrained males

• Main Author: Young, Jennifer M.
• Other Authors: Health and Physical Education
• Format: Others
• Language: en
• Published: Virginia Tech 2014
• Subjects: LD5655.V855 1991.Y684; Cardiovascular system > Physiology; Exercise > Physiological aspects; Stress (Physiology)
• Online Access: http://hdl.handle.net/10919/41491; http://scholar.lib.vt.edu/theses/available/etd-03122009-040921/

This study investigated the differences in the cardiovascular reactivity (CVR: HR, SBP, DBP) of trained and untrained individuals who performed the cold pressor test (CPT) after exercising for 30 minutes at 70% VO₂ max and participating in an attention control. Eighteen untrained and eleven trained males were randomly assigned to a treatment sequence. The subjects performed either 30 minutes of cycling at 70% VO₂ max Or an attention control. Following 48 hours, the other activity was performed. The CPT followed 1 hour after each treatment session. Rest, peak, and recovery measurements were acquired. Examination of trained and untrained group means, regardless of condition, indicated that trained subjects had lower HR measurements at rest (F_1,25 = 6.86, p < .05) and peak (F_1,25 = 6.33, p < .05). Closer examination of the different effects due to the acute exercise and control conditions regardless of training state did not reveal any beneficial effects due to the exercise bout. In addition, this study did not support differences in CVR to the CPT due to an interaction of acute exercise with the trained and untrained states of individuals. Resting measures did reveal reduced DBP (F_1,25 = 4.06, p < .05) and HR (F_1,25 = 3.19, p = .09) in trained subjects compared with the untrained following the exercise session indicating a beneficial reduction in the anticipatory response to the stressor. This study did not statistically support the effectiveness of 30 minutes of exercise at 70% VO₂ max or advantages of a physically trained state in reducing CVR to the CPT. In addition, this study did not support the effectiveness of the interaction of exercise at 70% VO₂ max with the trained or untrained state in reducing CVR to the CPT. === Master of Science