Neck strength and force in reaction time task of adolescent athletes with and without concussion history: A pilot study.

Assess the impact of concussion by comparing reaction time, peak force recruitment, and rate of force development of adolescent athletes returning from concussion against age- and sex-matched controls in visual-elicited neck movement. Athletes sat secured in a custom-built isometric device with their heads secured in a helmet and attached to a 6-axis load cell. They performed neck flexion, extension, and lateral flexion in response to a visual cue. Three trials in each direction were used for statistical analyses; peak force and rate of force development were normalized against athlete mass. Laboratory. 26 adolescent/young adult athletes (8F/18M), either recently concussed (and cleared for return to sport) or an age- and sex-matched healthy control. Reaction time, angle, standard deviation of angle, deviation from target angle, peak force, and RFD over 50, 100, 150,and 200 ms of movement were measured for each trial. Concussed athletes had decreased normalized peak force (P = 0.008) and rate of force development (P < 0.001–0.007). In neck extension, concussed athletes also had decreased movement precision (P = 0.012). Concussion is associated with alterations of neck biomechanics that decrease overall neck strength. • Concussion history associates with decreased neck strength parameters. • Concussion associates with decreased accuracy and precision in neck extension. • Neck force in extension remains higher than flexion or lateral bending. • No reaction time differences between groups in multi-directional task. [ABSTRACT FROM AUTHOR]

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