To the Editor: At the conclusion of their article on exercise-induced menstrual abnormalities (May 23 issue),1 Bullen et al. note, “A cardinal feature of exercise-associated menstrual disorders is unobtrusiveness.” We would like to report here additional evidence supporting this statement. We studied salivary progesterone in recreational runners and inactive women to determine whether even mild levels of exercise, much below those reported by Bullen et al., are associated with abnormalities of the luteal phase. Data on 15 cycles were collected from women identified as recreational runners averaging 12.5 miles (20 km) of running exercise a week (range, 5 to 60.
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