Neck muscle activity in skydivers during parachute opening shock

Scandinavian Journal of Medicine & Science in Sports
R Lo MartireBjörn O Ang

Abstract

This observational study investigated skydiver neck muscle activity during parachute opening shock (POS), as epidemiological data recently suggested neck pain in skydivers to be related to POS. Twenty experienced skydivers performed two terminal velocity skydives each. Surface electromyography quantified muscle activity bilaterally from the anterior neck, the upper and lower posterior neck, and the upper shoulders; and two triaxial accelerometers sampled deceleration. Muscle activity was normalized as the percentage of reference maximum voluntary electrical activity (% MVE); and temporal muscle activity onset was related to POS onset. Our results showed that neck muscle activity during POS reached mean magnitudes of 53-104% MVE, often exceeding reference activity in the lower posterior neck and upper shoulders. All investigated muscle areas' mean temporal onsets occurred <50 ms after POS onset (9-34 ms latencies), which is consistent with anticipatory motor control. The high muscle activity observed supports that the neck is under substantial strain during POS, while temporal muscle activation suggests anticipatory motor control to be a strategy used by skydivers to protect the cervical spine from POS. This study's findings con...Continue Reading

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Citations

Dec 3, 2016·BMJ Open Sport & Exercise Medicine·Anton Westman, Björn O Äng
Apr 16, 2017·Sports Medicine - Open·Riccardo Lo MartireBjörn O Äng
Dec 6, 2020·Military Medicine·Tyler F RooksFrederick T Brozoski

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