Head protection in football.
D000054:Acceleration; D000222:Adaptation, Physiological; D001265:Athletic Injuries / Q000517:prevention & control*; D055592:Biophysical Phenomena; D001703:Biophysics; D001921:Brain / Q000502:physiology; D001930:Brain Injuries / Q000517:prevention & control*; D005538:Football; D006260:Head Protective Devices / Q000592:standards*; D006801:Humans; D011482:Protective Devices / Q000592:standards*; D013312:Stress, Physiological