It would seem that they might have a long way to go to overpower the research on hCG and overtraining that's already been done.
One study, the title should be enough:
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Kujala UM, Alen M & Huhtaniemi IT 1990 Gonadotrophin-releasing hormone and human chorionic gonadotrophin tests reveal that both hypothalamic and testicular endocrine functions are suppressed during acute prolonged physical exercise. Clinical Endocrinology 33 219–225.
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