LightatNight4Weeks {Lock5Data}

Light at Night for Mice - After 4 Weeks

Description

Data from an experiment with mice having different nighttime light conditions

Format

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 a four 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

Details

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 four weeks in the experimental condition.
** This dataset was named LightatNight in the first edition **
** See also LightatNight8Weeks for the same data after 8 weeks or LightatNight with just BMGain after 3 weeks for the DM and LD groups. **

Source

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.