0009 Circadian Athletic Performance Variations When Travelling in the Canadian Football League
Notice bibliographique
Résumé
Abstract Introduction Previous studies have shown a circadian disadvantage in professional sports with teams traveling westward. This effect has been attributed to the circadian clock, core body temperature and associated decline in sports performance in the evening. Compared to the National Football League (NFL) teams, Canadian Football League (CFL) teams often travel longer distances and play at later times. As such, the objective of the present study was to investigate the circadian disadvantage in the CFL. Methods Data from 5 years of CFL regular season games were extracted from online databases (2016-2021). Wins, score differentials, first downs, average total, passing, penalty, and kickoff yards, pass completion percentages, interceptions, fumbles, sacks, and time of possession were extracted for both the offense (made) and defense (allowed) for every away evening game (after 6pm; n=387) as well as the direction of the travel (eastward, same time-zone, westward). Two-way ANOVAs of Direction of Travel (eastwards, same time-zone, westwards) on each performance variable were computed to study the circadian effect. Linear regression analyses were done to investigate the effect of the distance travelled by the away team (longitude travelled) on each performance variable. Results Significant effects of travel were found for team variables: score differentials (F[2,386]=3.86, p=.02) and time of possession (F[2,386]=5.42, p=.005). Significant results were also found for offensive variables: first downs (F(2,386)=2.91, p=.06), average kickoff return yards (F[2,386]=3.54, p=.03), fumbles (F[2,386]=2.38, p=.09), and for defensive variables: first downs allowed (F[2,386]=2.79, p=.06), average yards per play (F[2,386]=4.83, p=.008), average passing yards allowed (F[2,386]=3.14, p=.04), average kickoff yards allowed (F[2,386]=3.37, p=.04). Each significant post-hoc t-test revealed a circadian disadvantage to teams travelling westwards and a circadian advantage for teams travelling eastwards. Linear regression analyses showed that traveling westward predicts worst performances on some variables, with an increasing effect with distance travelled. Conclusion These results are consistent with previous findings showing that professional sports teams travelling westward show important challenges in evening games. In addition, our results highlight the fact that this disadvantage may affect not only the result of the games, but also the performance of players at a more individual level. Support (if any)
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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 | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 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; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».