Now they tell me! From the British Medical Journal:
ABSTRACT
Objective To investigate the risks of mild traumatic brain injury and neck injury associated with head banging, a popular dance form accompanying heavy metal music. Design Observational studies, focus group, and biomechanical analysis.
Participants Head bangers.
Main outcome measures Head Injury Criterion and Neck Injury Criterion were derived for head banging styles and both popular heavy metal songs and easy listening music controls.
Results An average head banging song has a tempo of about 146 beats per minute, which is predicted to cause mild head injury when the range of motion is greater than 75°. At higher tempos and greater ranges of motion there is a risk of neck injury.
Conclusion To minimise the risk of head and neck injury, head bangers should decrease their range of head and neck motion, head bang to slower tempo songs by replacing heavy metal with adult oriented rock, only headbang to every second beat, or use personal protective equipment.
Personal protective equipment? Like this?
Here is the conclusion.
Possible interventions to reduce the risk of injury caused by head banging include limiting the range of neck motion through a formal training programme delivered before a concert; substitution of adult oriented rock and easy listening music such as the controls, or others including Michael Bolton, Celine Dion, Enya, and Richard Clayderman, for heavy metal; and personal protective equipment such as neck braces to limit range of motion. Future research will involve neuropsychological testing of concert goers to validate the modelling presented in this paper, and randomised controlled trials of musical substitutes.
Michael Bolton, Celine Dion, Enya, and Richard Clayderman (who the hell is Richard Clayderman?) has to be the colace of headbangers.
I can see the following conversation:
Headbanger 1: I've got a headbanging injury from that Megadeth show. I'll be out of action for 2 weeks.
Headbanger 2: Dude. That sucks. What did the doctor prescribe?
HB 1: Michael Bolton and Celine Dion.
HB2: Awww, duuuuuuuude.
HT my friend Dave.