Fetal heart rate response to sustained recreational exercise

Article Abstract:

Fetal heart rate increases during and after maternal exercise, and the magnitude of the increase appears to rise with gestational age and the intensity and duration of exercise. Fetal heart rate was monitored in 120 healthy, physically active pregnant women before, during and after exercise. In all but 3% of the trials, FHR increased. The average overall increase was 15 beats per minute. Before the 26th week of pregnancy, FHR responses did not vary with type of exercise. After that, the FHR response to biking was significantly lower than that for other exercises such as running and swimming. At the same level of intensity, FHR increased an average of 10 beats per minute at 22.5 weeks and an average of 16 beats per minute at 29 weeks. At the same gestational age, FHR increased with exercise intensity. Also, FHR increased as the duration of exercise at the same intensity increased.

Fetal heart rate, Prenatal influences

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The effect of sustained exercise on follicular phase levels of 17beta-estradiol in recreational athletes

Article Abstract:

Sustained exercise may increase blood levels of the female sex hormone 17beta-estradiol in female athletes. A study examined the effect of 20 minutes of sustained exercise on the blood levels of 17beta-estradiol and cortisol, another hormone, in 75 women between 27 and 38 years old with a regular menstrual cycle who had been running or doing aerobics routinely for six months. The women's blood levels of 17beta-estradiol consistently increased after periods of sustained exercise. The elevation in blood levels of 17beta-estradiol increased as the level of exercise intensity increased. Blood levels of cortisol were not affected significantly by periods of sustained exercise. The rise in blood levels of 17beta-estradiol can be used to measure the changes in blood flow to the liver during sustained exercise.

Women athletes, Estradiol

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