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This small monograph is divided into three parts. The first deals with the work performed by the uterus during labor. The author demonstrated for the first time that a uterine contraction produces 4 calories of energy. During each hour of labor the output is about 42 calories, but when the patient bears down this is increased to 56 calories. An entire labor in a primpara is equivalent to the energy expended during two hours of strenuous work performed by a stone mason or a sawer of wood. In the second part of the monograph is a discussion of respiration during labor pains. The author maintains that during labor there is an increase in pulmonary aeration from 7 to 8 liters to 13 to 20 liters a minute. The third section of the book is devoted to the relationship of pregnancy to muscular activity. It is shown that light work does
Arbeitsphysiologie der Schwangerschaft: Wehenarbeit—Wehenatmung— Schwangerschaft u. Muskelarbeit. JAMA. 1936;107(18):1496. doi:10.1001/jama.1936.02770440072033
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