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. 2019 Apr 4;10:722. doi: 10.3389/fpsyg.2019.00722

Table 4.

The effect of physical activity type on amylase.

Activity type (# participants, #NEs) Time of day (h)/diurnal effect
Length of NE (h)/duration
n Beta p Beta p
Model 1. Activity levels
Sitting (21, NE = 31) 62 0.034 0.013 –0.34 0.08
Sitting + walking (11, NE = 17) 34 –0.30 0.30
Walkers (23, NE = 55) 110 –0.04 0.70
Model 2. Activity levels grouped
Sitting and sitting + walking (NE = 50) 96 0.034 0.013 –0.33 0.047
Walkers (NE = 55) 110 –0.04 0.702

Mixed model linear regressions of log amylase on time of day (diurnal effect), duration of the nature experience, and activity type during the NE. Model 1 includes three activity levels; Model 2 collapses “sitting” and “sitting + walking” to distinguish the two lower activity groups from the highest activity group “walkers” (n = 206 amylase measures from 103 NEs).