Academic journal article Research Quarterly for Exercise and Sport

Plasma Catecholamine and Cardiovascular Reactivity during an Acute Challenge Course Stress

Academic journal article Research Quarterly for Exercise and Sport

Plasma Catecholamine and Cardiovascular Reactivity during an Acute Challenge Course Stress

Article excerpt

Camille J. Bunting and Emma S. Gibbons, Texas A & M University

The primary purpose of this study was to describe physiological responses, to an acute challenge course stress, specifically epinephrine, norepinephrine, heart rate, and blood pressure. A secondary purpose was to explore possible relationships between the observed physiological responses and physical fitness. College-age men were recruited for preliminary [VO.sub.2] max testing to identify a high-fit and low-fit participant pool. Twelve were identified as eligible participants and gave informed consent. Six participants were in the high-fit category ([VO.sub.2] max [greater than] 60 ml/kg), and six in the low-fit category ([VO.sub.2] max [less than] 42 ml/kg). One participant in the low-fit group was later disqualified as a result of not following the dietary and medication restrictions. The Pamper Pole, a high challenge course event, was selected as the acute field-based challenge activity. During participation in the challenge event, heart rate (HR), systolic blood pressure (BPs) and diastolic blood pressur e (BPd) were measured. Also during the event, 10-ml blood samples were taken (via intravenous catheter) to be analyzed for epinephrine and norepinephrine. On arrival at the challenge course, participants had an intravenous catheter inserted in their nondominant arm then remained seated for a 20-min rest period prior to the event. …

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