A Two-Phased Approach to Quantifying Head Impact Sensor Accuracy: In-Laboratory and On-Field Assessments

High Energy Side and Rear American Football Head Impacts Cause Obvious Performance Decrement on Video

“…45 Independent tests done for the Virginia Tech 5STAR Sensor Rating found laboratory concordance correlation coefficient (CCC) to Reference headform of 0.97 and the IMM System was the best performing on-field sensor with a positive predictive value (PPV) of 96%. 38 Additional details on the IMM data acquisition can be found in the Appendix (Electronic supplementary material).…”

Quantifying head acceleration exposure via instrumented mouthguards (iMG): a validity and feasibility study protocol to inform iMG suitability for the TaCKLE project

“…► Phase 1 will determine the reliability and validity of the iMG kinematic magnitude measures, based on laboratory criterion standards. 13 14 ► Phase 2 will provide a sample of academy players with iMGs to wear in matches, to determine the on-field validity of the iMG. 13 15 16 ► Phase 3 will provide a sample of elite rugby league players with iMGs to evaluate fit, function and comfort from a player's perspective.…”

“…18 19 Phase 1-laboratory validation of kinematic measures Phase 1 is required to ensure that HAE data recorded on the iMGs are reliable and valid. The methodology builds on the work of Kieffer et al 13 who conducted a twophased approach evaluating the accuracy of a range of wearable head sensors (eg, mouthguards, ear patches). The aim of in-lab testing of kinematic measures (phase 1) is to evaluate the reliability and validity of the iMG kinematic magnitude measures at the Virginia Tech Head Impact Lab (USA).…”

“…In-lab testing can quantify measurement error through comparison to reference measurements in dummy headforms that are considered ground truth. 13 The dummy headform configuration consists of a medium-sized National Operating Committee on Standards for Athletic Equipment (NOCSAE) headform attached to a Hybrid III 50th percentile male neck, mounted on a linear slide table with 5 degrees-of-freedom. 20 21 Reference kinematics are measured at the headform centre of gravity with an instrumentation package consisting of three linear accelerometers (Endevco 7264b-2000; Meggitt Orange County, Irvine, California) and a triaxial angular rate sensor (DTS ARS3 Pro 18k; Diversified Technical Systems, Seal Beach, California).…”

Special Issue on Concussions in Sports

“…20 To provide an objective evaluation of both laboratory and on-field performance of head impact sensors, Kieffer et al developed a twophase approach to sensor testing. 13 The first phase used a pendulum impactor to test laboratory performance, followed by the second phase of on-field testing from video verification of impacts if the sensor performed adequately in the laboratory. A custom-fit mouthguard sensor had high accuracy in both laboratory and on-field testing.…”