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Labor
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Description
Exercise and Pregnancy

Different factors during pregnancy may interfere with the ability to exercise.
In early pregnancy, the mother tires easily and may suffer from morning sickness.

Labor is the process that expels the fetus from the uterus through the vagina.
Labor is initiated by the interaction of several hormones.
Control of contractions occurs via a positive feedback cycle.

True labor begins when uterine contractions occur at regular intervals.
False labor is associated with irregular contractions and no “show” (a discharge of blood with mucus).
True labor is divided into three stages:
Stage of dilation
Stage of expulsion
Placental stage

Weight increases and posture changes as the pregnancy continues.
Increased relaxin levels cause a change in gait.
Following delivery, it takes about 6 weeks for the maternal reproductive organs and physiology to return to the prepregnancy state. This period is the puerperium.
The reduction in size of the uterus is involution.
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