Effect of photoperiod on body mass, and daily energy intake and energy expenditure in young rats

被引:19
作者
Boon, P [1 ]
Visser, H [1 ]
Daan, S [1 ]
机构
[1] UNIV GRONINGEN,CTR ISOTOPE RES,NL-9747 AG GRONINGEN,NETHERLANDS
关键词
growth; photoperiod; body mass; food intake; energy expenditure; rats;
D O I
10.1016/S0031-9384(97)00271-0
中图分类号
B84 [心理学];
学科分类号
04 ; 0402 ;
摘要
In this experiment we investigate the effect of photoperiod on locomotor activity, body mass, food intake, growth efficiency (relationship between body mass change and food intake), energy expenditure, and body composition in growing Wistar rats. Two groups of animals were subjected to either a long, LD 18:6 (II = 8), Or Short photoperiod, LD 6:18 (n = 7), during a period of 190 days after weaning. Activity, body mass, food intake, and energy expenditure were measured during the study, as well as body composition at the end of the experiment. We show that growing rats exposed to short photoperiods (a) have a lower rate of weight gain, (b) have similar energy intakes, (c) have lower growth efficiency, (d) have lower daily energy expenditure and resting metabolic rate, and (e) gain less lean body mass than those exposed to long photoperiods. We suggest that the distribution of energy expenditure and food intake over the total 24-h cycle may be responsible for the differences in body weight gain between the two photoperiods. (C) 1997 Elsevier Science Inc.
引用
收藏
页码:913 / 919
页数:7
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