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24 difference score in the control condition indicates the opposite pattern, as if the participants’ in the control condition were more likely to experience an elevated heart rate over time. However, due to the large variability in the data, seen in the standard errors bars in Figure 9, it is hard to say if this effect would be replicable or relevant. 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8 Heart Rate (T3-T1) SAD Control Blue Figure 10: Change in Heart Rate from Time One to Time Three by Light Condition This figure shows the change in heart rate from the start of the experiment before light exposure, to the end of the light exposure, 45 minutes later across 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 after 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 heat rate pre-session to post-session was not significantly different across light condition, F(2,10) =0.044, p= .96. The difference scores between the initial heart rate measurement and the final heart rate measurement show a similar, although less dramatic, numerical pattern to the initial time and time two difference scores with the SAD and blue conditions resembling one another more closely than the higher control score (means: SAD = -3.8; Control = -2.2; Blue = - 3.2). Again, this pattern implies a link between a slightly elevated heart rate and the control condition as compared to the SAD and blue light conditions. Statistical tests and Change in Beats per MinutePDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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