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- Title
Menstrual cycle phase does not alter cardiovascular, respiratory and plasma catecholamine responses during incremental bicycle exercise.
- Authors
Hayashi, K.; Aizawa, K.; Nakamura, M.; Murai, F.; Mesaki, N.
- Abstract
OBJECTIVE and METHODS: Some evidence has indicated that the female sex hormones protect against the development of cardiovascular disease. The modulation of sympathetic activity may be one of the possible reasons for this. The influence of maximal cycle exercise was investigated oil cardiovascular (heart rate, mean blood pressure), respiratory (VׄO2, VׄCO2, VׄE, R) and plasma catecholamine (epinephrine and norepinephrine) responses in 6 normotensive, eumenorrheic young women (mean ± SD; age, 19.3 ± 0.2) in the early follicular (EF), ovulatory (OV) and mid-luteal (ML) phase. In each menstrual phase, subjects were asked to cycle starting at a work load of 50%VT (VT: ventilatory threshold) , which was increased by a load of 10%VT until the subject could not continue because of exhaustion. The heart rate and gas parameters (breath by breath method) were measured at rest and throughout the exercise: blood pressure was recorded every 2 minutes. Blood samples were obtained at rest, during exercise and immediately after exercise. RESULTS: The endurance time and total work rate were about 11 min. and 900 ∼ 1.000 J. respectively. The heart rate elevated to about 150 beat/min. at 100%VT (6 min.) and about 180 beat/min. at peak exercise. The mean arterial blood pressure rose to 100∼ 110 mmHg during exercise. Gas parameters, also, were typical patterns observed during incremental exercise. In plasma catecholamines, the data collected during exercise for the whole menstrual phase showed that epinephrine and norepinephrine had about a six-fold and about a ten-fold rise. respectively. There were no significant differences in cardiovascular, respiratory and sympatho-adrenal parameters between each menstrual cycle phase. CONCLUSION: Menstrual cycle phase does not alter cardiovascular, respiratory and plasma catecholamines responses during incremental bicycle exercise.
- Subjects
MENSTRUAL cycle; MENSTRUATION; CATECHOLAMINES; CHROMAFFIN cells; WOMEN'S health; AEROBIC exercises; CYCLING; CARDIOVASCULAR diseases
- Publication
Japanese Journal of Clinical Sports Medicine / Nihon Rinsho Supotsu, 2002, Vol 10, Issue 2, p295
- ISSN
1346-4159
- Publication type
Article