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were taken while the researcher was physically present. Due to technical errors, one participant’s data was excluded; for this reason, the n of this data set is 10. Technical errors also caused one participant’s initial time during the control session to not be taken. A substitute heart rate was created using the average of the participant’s initial heart rate from the other light sessions. 23 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8 Heart Rate (T2-T1) SAD Control Blue Figure 9: Change in Heart Rate from Time One to Time Two by Light Condition This figure shows the change in heart rate from the start of the experiment before light exposure, to 25 minutes into light exposure across the three different lighting conditions. Heart rate was taken over a two-minute period and the average of the two-minute period was used for the measurement. The heart rate measurement taken 25 minutes into the light session was subtracted from the initial heart rate to show the change over time. A negative score indicates that heart rate went down over time. The lighting conditions included one bright, white light (SAD), one dim, warm light (Control), and one dim, blue light (Blue). The error bars reflect the standard error of the mean. A one-way ANOVA indicated that change in heart rate from pre-session to mid- session was not significantly different across light condition, F(2,9) = 1.49, p= .25. Interestingly, the numeric pattern shows a similar difference score for both the SAD light condition as well as the blue light condition, but a wildly different, positive score for the control light condition (means: SAD = -6; Control = 1.7; Blue = -6.6). Heart rate at time two was typically lower than values at time one or time three (possibly due to the presence of the researcher at both time one and time three), but the average heart rate Change in Beats per MinutePDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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