Description Format Details Source
Data from an experiment with mice having different nighttime light conditions
A dataset with 27 observations on the following 9 variables.
Light | DM =dim light at night, LD =dark at night, or LL =bright light at night |
BMGain | Body mass gain (in grams over an eight week period) |
Corticosterone | Blood corticosterone level (a measure of stress) |
DayPct | Percent of calories eaten during the day |
Consumption | Daily food consumption (grams) |
GlucoseInt | Glucose intolerant? No or Yes |
GTT15 | Glucose level in the blood 15 minutes after a glucose injection |
GTT120 | Glucose level in the blood 120 minutes after a glucose injection |
Activity | A measure of physical activity level |
In this study, 27 mice were randomly split into three groups. One group was on a normal light/dark
cycle (LD), one group had bright light on all the time (LL), and one group had light during the day and
dim light at night (DM). The dim light was equivalent to having a television set on in a room. The mice in
darkness ate most of their food during their active (nighttime) period, matching the behavior of mice in the
wild. The mice in both dim light and bright light, however, consumed more than half of their food during
the well-lit rest period, when most mice are sleeping. Values in this dataset are recorded after eight weeks in the experimental condition.
** See also LightatNight4Weeks for the same data after 4 weeks or LightatNight with just BMGain after 3 weeks for just the DM and LD groups. **
Fonken, L., et. al., "Light at night increases body mass by shifting time of food intake," Proceedings of the National Academy of Sciences, October 26, 2010; 107(43): 18664-18669.
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