Table: Tracking The Body's Cycles
1:00 A.M. Pregnant women are most likely to go into labor. Lymphocytes (white blood cells) are at their peak. 2:00 A.M. Growth hormone levels are highest. 4:00 A.M. Asthma attacks are most likely. 6:00 A.M. Onset of menstruation is most likely. Plasma insulin is lowest. Blood pressure and heart rate begin to rise rapidly. 7:00 A.M. Symptoms of allergic rhinitis (hay fever) are worst. 8:00 A.M. Calories are burned most readily. Risk for heart attack and stroke is highest. Symptoms for rheumatoid arthritis are worst. 10:00 A.M. Gastrointestinal bleeding is most likely from ulcers. NOON Level of hemoglobin in blood peaks. 1:00 P.M. Serum cholesterol peaks. 3:00 P.M. Grip strength, respiratory rate, and reflex sensitivity highest; a good time for athletics. 4:00 P.M. Body temperature, pulse, and blood pressure peak. 6:00 P.M. Urinary flow is highest. 9:00 P.M. Pain threshold is lowest. 11:00 P.M. Skin is most reactive; allergic responses more likely. DATA: BUSINESS WEEK
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