Turbulence of Ambulance

Test	Seat-pad vibration total values [m/s2]
	Unweighted			Weighted
	Mean	SD	SD/Mean	Mean	SD	SD/Mean
Hand transport	1.46	0.29	0.20	1.06	0.25	0.24
Ambulance off-road	1.87	0.18	0.10	1.21	0.12	0.10
Ambulance urban	1.03	0.15	0.15	0.64	0.08	0.13
Helicopter cruise	1.02	0.05	0.05	0.27	0.02	0.07

Acceleration measured on the stretcher at feet, center of gravity and head position. Head is toward the front of the vehicle. ——Δ—— unweighted acceleration values, ---•--- Weighted acceleration values.

From data analysis it is evident that exposure of the patient’ feet to vertical vibrations is higher than the exposure suffered by the head. Since feet are above the rear vehicle axis and the head is near the ambulance center of mass, these differences are probably related to vehicle pitch.

Referenced from Whole body vibration in mountain-rescue operations, E. Alberti^a, D. Chiappa^b, G. Moschioni^a, B. Saggin^a,  , M. Tarabini^a