Background: Menstrual cycle and menstrual symptoms can affect the physical, mental and exercise performance of female athletes. Objectives: This study aimed to determine the associated symptoms of premenstrual, menstrual, and postmenstrual periods in female judo athletes by weight class. Methods: The participants were 169 female judo athletes aged between 18 and 21 years (age 19.5 ± 1.1 years, height 1.6 ± 0.1 m, body mass 64.8 ± 12.1 kg). Weight class and physical characteristics were measured using a questionnaire. Associated menstrual symptoms were measured using the Menstrual Distress Questionnaire (MDQ). For the purposes of this study, athletes of < 48 kg, < 52 kg, and < 57 kg weight were defined as "lightweight," athletes of < 63 kg and < 70 kg as "medium weight," and athletes of < 78 kg and > 78 kg as "heavyweight." Results: In the postmenstrual MDQ score, the scores for "lack of autonomic nervous system coordination" (P = 0.037), "poor concentration" (P = 0.046) and "water conservation" (P = 0.030) were higher in the lightweight ranks than in the medium and heavyweight ranks (P < 0.05). Scores for negative postmenstrual effects tended to be higher in the lightweight ranks than in the medium and heavy weight ranks (P = 0.053). For other items, there were no significant differences between the medium and heavy weight ranks and the lightweight ranks before, during, or after menstruation. Conclusions: This study shows that the degree of postmenstrual symptoms in female judo athletes varies with weight class. These results will contribute to support the condition of female judo athletes based on their menstrual cycle by weight class.
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