FATIGUE-RELATED RESPONSES FOR EXPLOSIVE NEUROMUSCULAR FUNCTION AND PERIPHERAL FATIGUE FOLLOWING RAPID AND RAMP ISOMETRIC CONTRACTIONS
Notice bibliographique
Résumé
Lacey Harper1, Benjamin Dalton2, Michaela Alesi1, Michael Cooper1, Jacob McDougle1, Trisha VanDusseldorp3, Robert Buresh, FACSM1, Yuri Feito, FACSM4, Garrett Hester1. 1Kennesaw State University, Kennesaw, GA. 2University of Guelph, Guelph, ON. 3Bonafide Health, Harrison, NY. 4American College of Sports Medicine, Indianapolis, IN. BACKGROUND: Neuromuscular fatigue following maximal voluntary isometric contractions (MVIC) dampens both rate of torque development (RTD) and rate of muscle activation (RMA), but the influence of contraction speed (i.e., rapid vs. slow) is less clear. The purpose of this study was to determine responses in explosive neuromuscular function and peripheral fatigue after fatiguing, rapid and ramp maximal isometric contractions. METHODS: Following a familiarization visit, twelve recreationally active, young males (22.8 ± 2.5 yrs) performed either rapid (FAST; as rapid as possible) or ramp (SLOW; 2 sec ramp-up) maximal voluntary isometric knee extensions. Protocol order was randomized and both protocols were stopped upon a 50% reduction in peak torque. Before and after each protocol, a rapid MVIC was performed and early (0-50 ms and 0-100 ms) and late (0-200 ms) RTD were calculated from the torque-time curve. RMA was assessed for the vastus lateralis using electromyography and was calculated as the root mean square from 0-50 ms relative to maximum root mean square. Following the MVICs, a series of electrically evoked singlets and doublets (10 Hz and 100 Hz) were delivered to assess indices of peripheral fatigue such as twitch amplitude and half relaxation time. Two-way (condition × time) repeated measures ANOVAs were used to identify differences between conditions across time. RESULTS: RTD from 0-50 ms (-56% vs -27%; p=0.020) and RMA (-64% vs +6%; p=0.026) were reduced more after SLOW compared to FAST, whereas similar reductions were found for other RTD time phases. Indices of peripheral fatigue were decreased similarly between conditions, but the larger effect size and relative increase for half relaxation time after SLOW (+43% vs +31%; p = 0.062) was noteworthy. CONCLUSIONS: These results suggest that early rapid torque production and RMA is reduced more after slow fatiguing contractions than fast. Though the physiological underpinnings cannot be completely elucidated, the impairment in RMA after slow contractions may be due to greater inhibitory feedback resulting from peripheral fatigue. Despite a similar total time under tension between protocols, the longer ramp-up during SLOW contractions likely allowed for greater peripheral disturbance.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
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 | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,001 |
| 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 ».