Why do muscle cramps occur?
While doing heavy exercise, fast running or any other heavy work the demand for energy is high. But the amount of oxygen to produce the energy is limited, then anaerobic respiration takes place in muscle cells to fulfill the demand of energy. Muscle cramps occur when muscles respire anaerobically. The partial breakdown of glucose into carbon dioxide and water produces lactic acid. The accumulation of lactic acid causes muscle cramps.
Hot water bath or massage helps improve the blood circulation. As a result more oxygen is supplied to the muscle cells. The increase in the supply of oxygen to the muscle cells results in the complete break down of lactic acid into carbon dioxide and water.
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Muscle cramps happen in someone who is sedentary all day long.
No, not quite. Prostaglandins are produced which cause the uterine contractions to push out menstrual flow, in a healthy woman this should not be painful. It's when the prostagladins are overproduced that menstrual cramps occur as these cause blood vessels to contract so cut off oxygen to the muscle.