ULTRADIAN CYCLE
\ˌʊltɹˈadi͡ən sˈa͡ɪkə͡l], \ˌʊltɹˈadiən sˈaɪkəl], \ˌʊ_l_t_ɹ_ˈa_d_iə_n s_ˈaɪ_k_əl]\
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Bouts of physical irritability or movement alternating with periods of quiescence. It includes biochemical activity and hormonal activity which may be cellular. These cycles are shorter than 24 hours and include sleep-wakefulness cycles and the periodic activation of the digestive system.
By DataStellar Co., Ltd
