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Results are specific for a Hybrid III 50th percentile male anthropomorphic head, which was chosen because it is the most widely used human head surrogate employed for impact testing.4 It provides an elastic skin envelope, and its inertial properties are considerably more biofidelic than those of ISO headforms specified in the CPSC safety standard.57 While the headform of the National Operating Committee on Standards for Athletic Equipment (NOCSAE) is considered to have the most biofidelic headform shape, integration of a neck and instrumentation is more difficult compared to a Hybrid III head.12 While there is precedent for impact testing using an unconstrained headform without a neck surrogate,21,33,39,40 the present study simulated quasi-physiologic head constraints with a Hybrid III neck.7 The Hybrid III neck was validated for flexion and extension, but has been shown to be overly stiff in lateral bending and axial compression.48 The Hybrid III head and neck combination has been used in a range of helmet impact studies4,7,27,36,44 and has been proposed for advanced testing of bicycle helmets.57 The experimental design was limited to a specific impact angle, location, and speed

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