What Is The Infradian Cycle

The human female Infradian Cycle refers to the physiological changes that occur in the female body over a period of time longer than 24 hours but shorter than a year. The most well-known Infradian Cycle in females is the menstrual cycle, which lasts approximately 28 days on average but can range from 21 to 35 days.

The female Infradian Cycle is regulated by a complex interplay of hormones, including estrogen, progesterone, follicle-stimulating hormone (FSH), and luteinizing hormone (LH). The cycle is divided into several phases, including the follicular phase, ovulation, and the luteal phase.

During the follicular phase, which lasts approximately 14 days, estrogen levels gradually increase, causing the lining of the uterus to thicken in preparation for potential pregnancy. At the same time, follicles in the ovaries are stimulated to grow and mature, with one follicle eventually becoming dominant.

Around day 14 of the cycle, ovulation occurs, in which the dominant follicle releases an egg that travels down the fallopian tube and into the uterus. This is the most fertile time of the cycle, and conception is most likely to occur during this period.

Following ovulation, the luteal phase begins, lasting approximately 14 days. During this phase, progesterone levels increase to prepare the uterus for potential pregnancy. If pregnancy does not occur, hormone levels drop, causing the uterine lining to shed, resulting in menstruation.

In addition to the menstrual cycle, other infradian rhythms in females include changes in basal body temperature, cervical mucus, and mood. These changes are regulated by hormones and can provide insight into fertility and overall health.