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Short-day adaptation of the circadian clock, which is located in the suprachiasmatic nucleus (SCN) of the hypothalamus, was tested by lengthening the photosensitive phase of the SCN (assayed by light-induced c-Fos expression in the SCN) as a parameter. We found that wheel-running activity does not inhibit the integration of the photoperiodic change by the SCN even if complete testicular regression is prevented. Moreover, this exercise was even capable of accelerating the lengthening of the photosensitive phase after the transfer to short day length. Thus, although wheel-running activity inhibits the short photoperiod-induced gonadal regression, it acts on the SCN to accelerate the integration of the photoperiodic change by the biological clock. <\/jats:p>","DOI":"10.1152\/ajpregu.00029.2004","type":"journal-article","created":{"date-parts":[[2004,8,19]],"date-time":"2004-08-19T23:02:35Z","timestamp":1092956555000},"page":"R234-R242","source":"Crossref","is-referenced-by-count":5,"title":["Conflicting effects of exercise on the establishment of a short-photoperiod phenotype in Syrian hamster"],"prefix":"10.1152","volume":"288","author":[{"given":"Jerome S.","family":"Menet","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Patrick","family":"Vuillez","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel","family":"Bonn","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aurore","family":"Senser","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paul","family":"P\u00e9vet","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"24","reference":[{"key":"R1","unstructured":"Arendt J. 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