Parameters:
(1) range in degrees for cervical spine movement
(2) music tempo in beats per minute (range from 80 to 180 beats pre minute)
range in degrees =
= (degrees flexion) + (degrees extension)
For an adult male the range of cervical spine is 60.4 degrees flexion and 69.9 degrees extension.
|
Range in Degrees
|
Curve for Head Injury Criteria
|
|
45
|
(0.000092 * ((tempo)^3)) – (0.0227 * ((tempo)^2)) + (1.928 * (tempo)) – 55.2
|
|
60
|
(0.000170 * ((tempo)^3)) – (0.04259 * ((tempo)^2)) + (3.903 * (tempo)) – 122.3
|
|
75
|
(0.00030 * ((tempo)^3)) – (0.07098 * ((tempo)^2)) + (5.874 * (tempo)) – 159.2
|
|
90
|
(0.000443 * ((tempo)^3)) – (0.1018 * ((tempo)^2)) + (8.389 * (tempo)) – 235.5
|
|
105
|
(0.000616 * ((tempo)^3)) – (0.1377 * ((tempo)^2)) + (11.07 * (tempo)) – 307.7
|
|
120
|
(0.000934 * ((tempo)^3)) – (0.2207 * ((tempo)^2)) + (19.05 * (tempo)) – 575.4
|
where:
• The units for NIC are (m^2)/(s^2) but no units are shown for HIC.
For ranges in-between, the neck criteria can be approximated using:
(1) base value for range
(2) ceiling value for range
(3) 15 degrees (range in degrees between base and ceiling)
(4) number of degrees minus base in degrees
approximate head injury criteria in meter-squared divided by second-squared =
= (base value) + (((degrees) – (base degrees)) / 15 * ((ceiling value) – (base value)))
An HIC >= 135 may be associated with headache or dizziness (AIS 1).
An HIC >= 520 may be associated with unconsciousness for less than 1 hour (AIS 2).
An HIC >= 900 may be associated with unconsciousness for 1-6 hours (AIS 3).
