The effects of resistance training to near volitional failure on motor unit recruitment during neuromuscular fatigue.
Electromyography
Failure
Motor unit action potential
Motor unit physiology
Muscle fatigue
Reps in reserve (RIR)
Resistance training
Volitional fatigue
Journal
PeerJ
ISSN: 2167-8359
Titre abrégé: PeerJ
Pays: United States
ID NLM: 101603425
Informations de publication
Date de publication:
2024
2024
Historique:
received:
12
03
2024
accepted:
02
09
2024
medline:
18
10
2024
pubmed:
18
10
2024
entrez:
18
10
2024
Statut:
epublish
Résumé
It is unclear whether chronically training close to volitional failure influences motor unit recruitment strategies during fatigue. We compared resistance training to near volitional failure Nineteen resistance-trained adults (11 males, 8 females) underwent 5 weeks (3×/week) of either low repetitions-in-reserve (RIR; 0-1 RIR) or high RIR training (4-6 RIR). Before and after the intervention, participants performed isometric contractions of the knee extensors at 30% of maximal peak torque until exhaustion while vastus lateralis sEMG signals were recorded and later decomposed. MUAP and sEMG excitation for the vastus lateralis were quantified at the beginning, middle, and end of the fatigue assessment. Both training groups improved time-to-task failure (mean change = 43.3 s, 24.0%), with no significant differences between low and high RIR training groups (low RIR = 28.7%, high RIR = 19.4%). Our fatigue assessment revealed reduced isometric torque steadiness and increased MUAP amplitude and sEMG excitation during the fatiguing task, but these changes were consistent between groups. Both low and high RIR training improved time-to-task failure, but resulted in comparable motor unit recruitment during fatiguing contractions. Our findings indicate that both low and high RIR training can be used to enhance fatiguability among previously resistance-trained adults.
Sections du résumé
Background
UNASSIGNED
It is unclear whether chronically training close to volitional failure influences motor unit recruitment strategies during fatigue.
Purpose
UNASSIGNED
We compared resistance training to near volitional failure
Methods
UNASSIGNED
Nineteen resistance-trained adults (11 males, 8 females) underwent 5 weeks (3×/week) of either low repetitions-in-reserve (RIR; 0-1 RIR) or high RIR training (4-6 RIR). Before and after the intervention, participants performed isometric contractions of the knee extensors at 30% of maximal peak torque until exhaustion while vastus lateralis sEMG signals were recorded and later decomposed. MUAP and sEMG excitation for the vastus lateralis were quantified at the beginning, middle, and end of the fatigue assessment.
Results
UNASSIGNED
Both training groups improved time-to-task failure (mean change = 43.3 s, 24.0%), with no significant differences between low and high RIR training groups (low RIR = 28.7%, high RIR = 19.4%). Our fatigue assessment revealed reduced isometric torque steadiness and increased MUAP amplitude and sEMG excitation during the fatiguing task, but these changes were consistent between groups.
Conclusion
UNASSIGNED
Both low and high RIR training improved time-to-task failure, but resulted in comparable motor unit recruitment during fatiguing contractions. Our findings indicate that both low and high RIR training can be used to enhance fatiguability among previously resistance-trained adults.
Identifiants
pubmed: 39421412
doi: 10.7717/peerj.18163
pii: 18163
pmc: PMC11485100
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e18163Informations de copyright
© 2024 Beausejour et al.
Déclaration de conflit d'intérêts
The authors declare that they have no competing interests.