Measuring Head Kinematics in Football: Correlation Between the Head Impact Telemetry System and Hybrid III Headform.
Summary of "Measuring Head Kinematics in Football: Correlation Between the Head Impact Telemetry System and Hybrid III Headform."
Over the last decade, advances in technology have enabled researchers to evaluate concussion biomechanics through measurement of head impacts sustained during play using two primary methods: (1) laboratory reconstruction of open-field head contact, and (2) instrumented helmets. The purpose of this study was to correlate measures of head kinematics recorded by the Head Impact Telemetry (HIT) System (Simbex, NH) with those obtained from a Hybrid III (HIII) anthropometric headform under conditions that mimicked impacts occurring in the NFL. Linear regression analysis was performed to correlate peak linear acceleration, peak rotational acceleration, Gadd Severity Index (GSI), and Head Injury Criterion (HIC(15)) obtained from the instrumented helmet and HIII. The average absolute location error between instrumented helmet impact location and the direction of HIII head linear acceleration were also calculated. The HIT System overestimated Hybrid III peak linear acceleration by 0.9% and underestimated peak rotational acceleration by 6.1% for impact sites and velocities previously identified by the NFL as occurring during play. Acceleration measures for all impacts were correlated; however, linear was higher (r (2) = 0.903) than rotational (r (2) = 0.528) primarily due to lower HIT System rotational acceleration estimates at the frontal facemask test site. Severity measures GSI and HIC were also found to be correlated, albeit less than peak linear acceleration, with the overall difference between the two systems being less than 6.1% for either measure. Mean absolute impact location difference between systems was 31.2 ± 46.3° (approximately 0.038 ± 0.050 m), which was less than the diameter of the impactor surface in the test. In instances of severe helmet deflection (2.54-7.62 cm off the head), the instrumented helmet accurately measured impact location but overpredicted all severity metrics recorded by the HIII. Results from this study indicate that measurements from the two methods of study are correlated and provide a link that can be used to better interpret findings from future study using either technology.
Simbex, 10 Water Street, Suite 410, Lebanon, NH, 03766, USA, firstname.lastname@example.org.
This article was published in the following journal.
Name: Annals of biomedical engineering
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21994068
- DOI: http://dx.doi.org/10.1007/s10439-011-0422-2
Like pedestrians, bicyclists are vulnerable road users, representing a population with a high risk of fatal and severe injuries in traffic accidents as they are unprotected during vehicle collisions. ...
The head impact exposure for athletes involved in football at the college and high school levels has been well documented; however, there is limited information regarding youth football players, despi...
An athlete is thought to reduce head acceleration after impact by contracting the cervical musculature, which increases the effective mass of the head.
Most studies of pedestrian injuries focus on reducing traumatic injuries due to the primary impact between the vehicle and the pedestrian. However, based on the Pedestrian Crash Data Study (PCDS), som...
ABSTRACT Objective: The impact force to the head and neck were measured in sled tests with and without inflation of a combo airbag for a far-side occupant to determine the risk for basilar skull fract...
Head impacts in sports can lead to brain injury even when the participant is wearing a helmet. The forces that contribute to brain injury from sports-related head impacts are not well und...
The purpose of this study is to determine if the Ascension PyroCarbon Radial Head is safe and effective in the treatment of arthritis, fractures, symptoms from radial head resections, and ...
The purpose of this study is to determine whether Transcranial Doppler measurements have correlation with neuropsychological test (Galvestone Orientation Amnesia Test), TC image (Marshall ...
The primary objective of this study is to describe, in detail, patterns of care for head and neck carcinoma patient
Through this study, we hope to learn more about the mechanisms, which may contribute to development and progression of head and neck cancer. The long-term goal of this study will be to de...
Medical and Biotech [MESH] Definitions
Voluntary or involuntary motion of head that may be relative to or independent of body; includes animals and humans.
A condition in which the HEAD of the FETUS is larger than the mother's PELVIS through which the fetal head must pass during a vaginal delivery.
Posture while lying with the head lower than the rest of the body. Extended time in this position is associated with temporary physiologic disturbances.
Personal devices for protection of heads from impact, penetration from falling and flying objects, and from limited electric shock and burn.
A class of membrane lipids that have a polar head and two nonpolar tails. They are composed of one molecule of the long-chain amino alcohol sphingosine (4-sphingenine) or one of its derivatives, one molecule of a long-chain acid, a polar head alcohol and sometimes phosphoric acid in diester linkage at the polar head group. (Lehninger et al, Principles of Biochemistry, 2nd ed)