Figures & data
FIGURE 2 Body temperature (Tb) 24 h rhythms (left, A-C) and 6-sulphatoxymelatonin (6-SMT) levels (right, D-F) under Control (CON) conditions of 12L:12D, lights were on at 08:00. CON with light interferences of 15 min at ZT17 (LI), Exposure to short photoperiod (SP) of 8L:16D, and after exposure to SP with LI – three times a night, for two weeks (SP-CLI). Black bars on the bottom indicate dark period, gray bars indicate dark period only in the SP or SP-CLI groups (lights were off at 16:00). Wide arrow indicates LI of 30 min, in the LI group, narrow arrows indicate light interference of 15 min, in the SP-CLI group. *indicates significant change (p < 0.05) between demonstrated experimental groups.
FIGURE 3 Body temperature (Tb) 24 h rhythm after three weeks of acclimation to short photoperiod (SP, 8L:16D, black line), SP with light interference (LI) three times a night for 15 min (SP-CLI, dark dashed grey curve) and SP-CLI with MLT added to the drinking water at the last day (SP-CLI-MLT, dotted light grey curve). Top MLT arrow indicates time of MLT given in the drinking water to SP-CLI-MLT group. Data represents average of eight animals ± S.E.M. measured every three hours.
