Magnetic induction of a circadian cycle in hamsters

Abstract

Abstract Locomotor activity in hamsters, Mesocricetus auratus. in 24‐h LD cycles with light from 06.00 to 18.00 h, and simultaneously in imposed 26‐h weak magnetic cycles (ranges varying from 0.260 to 0.008 gauss), significantly reflected both periods. A 24‐h circadian pattern (ca. 200% of mean) was modulated by a concurrent 26‐h circadian pattern (range ca. 14% of mean).