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).