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Re‐entrainment of circadian rhythm of plasma melatonin on an 8‐h eastward flight
Author(s) -
Takahashi Toshiharu,
Sasaki Mitsuo,
Itoh Hiroshi,
Sano Hidetaka,
Yamadera Wataru,
Ozone Motohiro,
Obuchi Keita,
Nishimura Hiroshi,
Matsunaga Naoki
Publication year - 1999
Publication title -
psychiatry and clinical neurosciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.609
H-Index - 74
eISSN - 1440-1819
pISSN - 1323-1316
DOI - 10.1046/j.1440-1819.1999.00537.x
Subject(s) - entrainment (biomusicology) , zeitgeber , circadian rhythm , melatonin , orthodromic , rhythm , medicine , blood sampling , endocrinology , circadian clock , stimulation
To estimate the process of re‐entrainment we measured the melatonin rhythm on an eastward flight. After the baseline study, 24‐hour blood sampling of six male subjects was done on the first and fifth days. During the daytime the subjects were exposed to natural zeitgeber outdoors every day except the blood sampling day. They were analyzed with an illuminometer when under the bright light condition. Four of the six subjects showed orthodromic re‐entrainment, another subject showed antidromic re‐entrainment, and the other subject kept the baseline pattern of plasma melatonin. The rate of re‐entrainment in orthodromic re‐entrainment was about 55 min per day. Measuring the circadian rhythm of plasma melatonin has clarified the inter‐individual re‐entrainment difference.