Within-day and between-day reliability of a novel test to evaluate back extensor strength in healthy individuals.
Notice bibliographique
Résumé
Abstract Background Proximal junctional kyphosis (PJK) is a common complication of long spinal fusion. The prevalence of PJK ranges between 6 and 41% and frequently requires reoperation. One of the potential causes is thought to be posterior muscle dissection within the fused range at the time of posterior fusion. Various measurement protocols have been tested to evaluate extensor muscle strength, endurance and power in adults. However, it is not universally accessible and is rarely used clinically due to the high cost, requirement for considerable user expertise, demands on the functional capacities of the patient and protracted testing time. Currently, the Biering–Sørensen test is the most widely used isometric test for assessing extensor muscle endurance. But, it was deemed unsuitable and difficult for older patients with chronic low back pain undergoing spine surgery. In this study, we designed a simple method that allows us to perform lumbar spine extensor strength tests in a comfortable seated position. This study aimed to assess the within-day and between-day reliability of this novel test for evaluating back extensor strength in healthy individuals. Methods In this study, we examined 79 healthy subjects (33 males and 46 females), who were 25–63 years of age. The subjects were placed in a seated position on the novel chair and secured tightly with a lap belt. In each session, the subjects were asked to extend their backs against the force transducer at maximum capacity, maintaining the extension for 5 seconds. The maximal force delivered over that period was recorded. The subjects had a practice trial followed by three forceful extensions with pausing intervals of 30 seconds. Measurements were obtained by one of three trained raters, and the average force of all three trials was recorded. A follow-up session was carried out within 14 days. Intra-class correlation coefficients (ICCs) were used to assess within-day and between-day reliability. Results The mean force in the initial session was 314.6±118.3 N, and it was 318.6±123.6 N in the follow-up session. The ICCs for within-day reliability and between-day reliability were 0.89 [95%CI: 0.83–0.92] and 0.88 [95% CI: 0.81–0.93], respectively. There was a strong correlation between the average measures of the initial and follow-up sessions (r = 0.80; p < 0.001; R2 = 0.62). Conclusion The use of the static dynamometer chair is a reliable, non-invasive, cost-effective test that facilitates the assessment of the strength of lumbar spine extensors in healthy adults.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,002 | 0,003 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,001 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 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 source (Gemma direct ou Codex distillé), 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 ».