Changes in rectal temperature. White circles with the dotted line indicate summer data (n = 17, mean ± S.E), and black squares with the solid line indicate winter data (n = 17, mean ± S.E). Tre tended to be lower in the period between 40 and 70 min during cold exposure and was significantly lower in the period between 50 and 60 min during cold exposure in winter than it was during the same periods in summer. Furthermore, in winter, Tre was significantly greater at 100 min than it was in the period between 70 and 80 min during cold exposure. †
P < 0.1, *P < 0.05 when summer and winter values were compared. #
P < 0.05 when winter values were compared within the other winter values.