Assessment of high velocity head impacts using transcranial magnetic stimulation in Australian national ice hockey players: a multiple-case study
Notice bibliographique
Résumé
Comprising of eight teams, players in the Australian Ice Hockey League (AIHL) are elite, attracting college players from the United States and Canada, as well as former professional players from European and American Leagues up to the standard of the National Hockey League (NHL). To date, no study has tracked in-game head impacts with follow-up measures in AIHL players. The aim of this multiple-case study was to investigate neurophysiological responses using transcranial magnetic stimulation (TMS) following high impact events over the course of the 2016 AIHL season. Data was collected from 11 male players (28.8 ± 6.8 years) recruited from one AIHL team. Using previously published methods for concussion studies,1, 2 TMS (MagVenture, Denmark) was used to quantify corticospinal excitability, via motor evoked potential (MEP) amplitude and intracortical inhibition from TMS cortical silent period (cSP). Players who had registered a high threshold event (66 g or 4500 rads/s2) during the game using impact sensors (X2 Biosystems, USA) were compared at three and 10 days, to their baseline measures. Six players sustained in-match impacts of greater than 66 g or 4,500 rads/s2 (mean in- match linear acceleration of 93.48 ± 21.68 g; mean rotational acceleration of 12,532.76 ± 4,682.76 rads/s2). All six players showed no immediate signs or symptoms of concussion post-match. Clinical follow up, at three days post-match, revealed five of the six players were asymptomatic. However, three of these players showed an increase in cSP between 6.7 ms to 10.6 ms, returning to baseline levels by 10 days. Despite no immediate symptoms, one athlete who sustained a 98.8 g/19,703.89 rads/s2 impact was found to have delayed symptoms of concussion in follow up clinical assessment and testing at both three and 10 days post-match. This player demonstrated no change in MEP amplitude but displayed an increased cSP of 20.8 ms at three days, remaining increased by 23.98 ms at 10 days, in comparison to baseline. The findings of this study reinforce previous TMS studies investigating corticospinal responses during the acute recovery phase following concussion.1-3 This multi-case study illustrates measureable changes in corticospinal excitability associated with high impact head trauma that may not manifest as concussion immediately, and can also be an adjunct to follow up clinical assessment for return to play decisions.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,004 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,002 | 0,000 |
| Bibliométrie | 0,013 | 0,003 |
| Études des sciences et des technologies | 0,001 | 0,003 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,003 | 0,001 |
| Intégrité de la recherche | 0,002 | 0,003 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; les deux têtes enseignantes s’accordent sur ce qui est montré ici.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».