Numerous works show a circadian rhythm of activity in several species of animals; the ultradian rhythms have not received much interest. This study investigated whether the circadian motor activity rhythm would be synchronized to two non-24h light cycles and explored the effects of these light-dark cycles on different ultradian rhythms. We used a radar-doppler detection system. Inbred strains of mice BALB/C and C57BL/6 were exposed to a 24LD cycle and then to a shorter (10.5:10.5 LD) or longer (14:14 LD) cycle. Time series corresponding to observation periods of seven days were analysed by Discrete Fourier Transform and Chi-Square periodogram. BALB/C synchronized to T21 and T28 cycles, whereas C57BL/6 did not. In both strains the motor activity showed ultradian components. Some ultradian rhythm was affected from the synchronization of the circadian rhythm to the non-24h light cycles. The relation of the compound structure of the circadian and ultradian rhythms is discussed.

Circadian and ultradian motor activity rhythms under 21h and 28h lighting cycles / Eugenio, Scannapieco; Pasquali, Vittorio; Renzi, Paolo. - In: BIOLOGICAL RHYTHM RESEARCH. - ISSN 0929-1016. - 40:4(2009), pp. 307-316. [10.1080/09291010802214716]

Circadian and ultradian motor activity rhythms under 21h and 28h lighting cycles

PASQUALI, Vittorio;RENZI, Paolo
2009

Abstract

Numerous works show a circadian rhythm of activity in several species of animals; the ultradian rhythms have not received much interest. This study investigated whether the circadian motor activity rhythm would be synchronized to two non-24h light cycles and explored the effects of these light-dark cycles on different ultradian rhythms. We used a radar-doppler detection system. Inbred strains of mice BALB/C and C57BL/6 were exposed to a 24LD cycle and then to a shorter (10.5:10.5 LD) or longer (14:14 LD) cycle. Time series corresponding to observation periods of seven days were analysed by Discrete Fourier Transform and Chi-Square periodogram. BALB/C synchronized to T21 and T28 cycles, whereas C57BL/6 did not. In both strains the motor activity showed ultradian components. Some ultradian rhythm was affected from the synchronization of the circadian rhythm to the non-24h light cycles. The relation of the compound structure of the circadian and ultradian rhythms is discussed.
2009
circadian; fourier; mice; motor activity; rhythms; ultradian
01 Pubblicazione su rivista::01a Articolo in rivista
Circadian and ultradian motor activity rhythms under 21h and 28h lighting cycles / Eugenio, Scannapieco; Pasquali, Vittorio; Renzi, Paolo. - In: BIOLOGICAL RHYTHM RESEARCH. - ISSN 0929-1016. - 40:4(2009), pp. 307-316. [10.1080/09291010802214716]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/20409
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