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Cortisol, blood pressure, and heart rate responses to food intake were independent of physical fitness levels in women

Citation

Jayasinghe, SU and Torres, SJ and Fraser, SF and Turner, AI, Cortisol, blood pressure, and heart rate responses to food intake were independent of physical fitness levels in women, Applied physiology, nutrition, and metabolism = Physiologie appliquée, nutrition et métabolisme, 40, (11) pp. 1186-1192. ISSN 1715-5312 (2015) [Refereed Article]


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Copyright Statement

Copyright 2015 Canadian Science Publishing

DOI: doi:10.1139/apnm-2015-0168

Abstract

This research tested the hypothesis that women who had higher levels of physical fitness will have lower hypothalamo-pituitary-adrenal axis (cortisol) and sympatho-adrenal medullary system (blood pressure and heart rate) responses to food intake compared with women who had low levels of physical fitness. Lower fitness (n = 22; maximal oxygen consumption = 27.4 ± 1.0 mL∙kg(-1)·min(-1)) and higher fitness (n = 22; maximal oxygen consumption = 41.9 ± 1.6 mL∙kg(-1)·min(-1)) women (aged 30-50 years; in the follicular phase of the menstrual cycle) who participated in levels of physical activity that met (lower fitness = 2.7 ± 0.5 h/week) or considerably exceeded (higher fitness = 7.1 ± 1.4 h/week) physical activity guidelines made their own lunch using standardised ingredients at 1200 h. Concentrations of cortisol were measured in blood samples collected every 15 min from 1145-1400 h. Blood pressures and heart rate were also measured every 15 min between 1145 h and 1400 h. The meal consumed by the participants consisted of 20% protein, 61% carbohydrates, and 19% fat. There was a significant overall response to lunch in all of the parameters measured (time effect for all, p < 0.01). The cortisol response to lunch was not significantly different between the groups (time × treatment, p = 0.882). Overall, both groups showed the same pattern of cortisol secretion (treatment p = 0.839). Systolic blood pressure, diastolic blood pressure, mean arterial pressure, or heart rate responses (time × treatment, p = 0.726, 0.898, 0.713, and 0.620, respectively) were also similar between higher and lower fitness women. Results suggest that the physiological response to food intake in women is quite resistant to modification by elevated physical fitness levels.

Item Details

Item Type:Refereed Article
Keywords:stress, TSST, fitness, women, nutrition
Research Division:Medical and Health Sciences
Research Group:Clinical Sciences
Research Field:Endocrinology
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Clinical Health (Organs, Diseases and Abnormal Conditions) not elsewhere classified
UTAS Author:Jayasinghe, SU (Mr Sisitha Jayasinghe)
ID Code:135781
Year Published:2015
Web of Science® Times Cited:1
Deposited By:Health Sciences
Deposited On:2019-11-13
Last Modified:2019-12-16
Downloads:2 View Download Statistics

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