Examination of the Construct Validity of Nextiles Sleeve as a Measure of Peak Elbow Varus Torque
Notice bibliographique
Résumé
Context New wearable circuited fabric biomechanic technology that can be used in a more ecological context to measure elbow-varus torque and throw count is now available but needs to be validated compared with markerless biomechanics. Objective To examine the construct validity of the Nextiles Arm Sleeve by assessing its agreement and convergence with markerless 3-dimensional (3D) biomechanics used as a reference for (1) peak elbow-varus torque and (2) pitches thrown with separate analyses for fastballs, breaking balls, and changeups. Design Cross-sectional study. Setting Laboratory. Patients or Other Participants A total of 29 collegiate pitchers (age = 19.5 ± 1.3 years, height = 1.88 ± 0.06 m, mass = 91.7 ± 9.5 kg, body mass index = 26.2 ± 1.9 kg/m 2 ) participated. Intervention(s) Pitchers were assessed simultaneously via the Nextiles sleeve and markerless 3D motion capture (KinaTrax) as they threw fastballs, breaking balls, and changeups to a catcher at regulation distance. Main Outcome Measure(s) Nested Bland-Altman limits of agreement (LoA) for construct validity, mixed-effects linear regressions for convergence validity, and intraclass correlation coefficients (ICCs) for test-retest reliability were calculated between the Nextiles sleeve and 3D biomechanics for elbow-varus torque. We determined that an a priori acceptable threshold for LoA and convergence was a 95% CI width of 0.15 and 95% CI lower limit of 0.50. Results Pitchers threw 200 pitches (fastball: 72%, n = 143; breaking ball: 14%, n = 27; changeup: 15%, n = 30), with 182 pitches recorded by the Nextiles sleeve and 18 pitches (n = 3 pitchers) not recorded due to technical errors. Agreement and validity for pitch measures (mean difference [lower, upper] LoA = 6.7 N·m [–26.2, 39.6 N·m]; β = 0.31 [0.12, 0.52]; Nextiles sleeve ICC [95% CI] = 0.96 [0.93, 0.98]; KinaTrax ICC [95% CI] = 0.97 [0.94, 0.98]) were higher compared with agreement for body weight × height (BW×H; mean difference [lower, upper] LoA = 0.37 BW×H [–1.41, 2.45 BW×H]; β = 0.37 [–1.41, 2.15]; Nextiles sleeve ICC [95% CI] = 0.93 [0.88, 0.96]; KinaTrax ICC [95% CI] = 0.95 [0.92, 0.98]). We found no interaction per pitch type ( P = .47) or pitch thrown ( P = .58). Conclusions The Nextiles sleeve collected pitch counts accurately except for 3 pitchers for whom it did not collect any pitches thrown due to technical errors. However, the demonstrated LoA and convergence were beyond the a priori acceptability threshold and lower than the a priori defined acceptable lower bound of the 95% CI. These results suggest that the Nextiles sleeve does not measure the same construct as KinaTrax.
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Comment cette classification a été obtenuedéplier
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 | 0,002 | 0,002 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,001 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| 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 ».