No circadian or ultradian periodicity of serum LH and FSH levels was discerned in 4 male subjects studied half-hourly to hourly over a 48-hr period, although intermittent non-concordant elevations in the level of both hormones noted. These subjects manifested a normal reproducible periodicity of plasma cortisol and growth hormone levels.
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Krieger et al. (1972) studied this question.