It is generally recognized that weight gain leads to performance decrement in female long jumpers. However, the problem in weight control, the relationship between weight and performance, and the factors affecting weight change remains unclear. To reveal these problems and obtain the useful knowledge for coaching on weight control of female long jumpers, 24 female long jumpers were participated in a questionnaire survey. As a result, it was revealed that massive weight gain or loss can decrease the performance. However, the relationship between weight and performance varied from athlete to athlete. We also found that the factors affecting weight change were variety (stress, season, illness and so on) and hierarchically, and the effects of coaching on weight control differ to not only the contents but also the relationship with athletes. In conclusion, this study revealed that weight gain doesn't always lead to performance decrement and weight control should conduct adequately with consideration for the individuality.
