Spend time outdoors for your brain – an in-depth longitudinal MRI study

Figures & data

Figure 1. (A) Illustration of the data collected from a single subject, (B) cluster in the dorsolateral prefrontal cortex (DLPFC) showing a positive association between grey matter probability and self-reported hours spent outdoors, and (C) for illustrative purposes only, we plot a line graph depicting the regression of the extracted grey matter values of each subject from DLPFC (right), the y-axis has a break, as indicated by the break symbol.

Table 1. Characterisation of the study participants (SD in brackets).

ID^a	1	3	5	6	7	8
Weight at inclusion into study (kg)^b	58.1	68.8	64.9	63.0	72.3	59.7
Mean body weight (kg)^b	59.4 (0.83)	69.0 (0.83)	63.5 (0.72)	63.1 (0.68)	71.8 (0.71)	59.2 (0.46)
Mean hours physical activity^c	0.13 (0.32)	0.22 (0.55)	0.35 (0.77)	1.55 (1.04)	0.51 (0.76)	0.21 (0.55)
Mean liquid intake (l)^c	1.86 (0.43)	2.12 (0.70)	1.68 (0.76)	2.81 (0.86)	3.38 (0.93)	1.50 (0.57)
Mean number of alcoholic drinks^c	0 (0)	0 (0)	0 (0)	0.57 (1.5)	0.66 (1.56)	0.18 (0.65)
Mean number of caffeinated drinks^c	0.02 (0.14)	6 (1.63)	1.68 (1.54)	1.70 (1.50)	2.08 (1.02)	1.51 (1.10)
Mean number of caffeinated drinks last 2 h	0 (0)	0.96 (0.39)	0.68 (0.91)	0.18 (0.49)	0.28 (0.60)	0.40 (0.61)
Mean number of cigarettes^c	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	0.03 (0.16)
Urbanicity score during first 15 years in life	33	15	45	30	33	15

^aThe participant ID is based on the numbering used in the protocol paper of the Day2day study (Filevich et al. 2017).

^bWeight was measured with clothing.

^cDuring the last 24 h before MRI scanning.

Filevich E, Lisofsky N, Becker M, Butler O, Lochstet M, Martensson J, Wenger E, Lindenberger U, Kuhn S. 2017. Day2day: investigating daily variability of magnetic resonance imaging measures over half a year. BMC Neurosci. 18(1):65.

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Data availability statement

The data has been shared and can be shared with scientists interested in it upon request to the first author.