Pre-activation affects the effect of stretch-shortening cycle by modulating fascicle behavior.
Fascicle behavior
Residual force depression
Residual force enhancement
Journal
Biology open
ISSN: 2046-6390
Titre abrégé: Biol Open
Pays: England
ID NLM: 101578018
Informations de publication
Date de publication:
20 Dec 2019
20 Dec 2019
Historique:
entrez:
22
12
2019
pubmed:
22
12
2019
medline:
22
12
2019
Statut:
epublish
Résumé
The torque attained during active shortening is enhanced after an active stretch (stretch-shortening cycle, SSC). This study examined the influence of pre-activation on fascicle behavior and the SSC effect. Subjects exhibited the following three conditions by electrically induced plantar flexions. In the isometric-concentric (ISO-CON) condition, subjects exhibited active shortening from dorsiflexion of 15° to 0° after isometric pre-activation. In the eccentric-concentric (ECC-CON) condition, subjects exhibited the above active shortening immediately after the eccentric pre-activation. In the isometric-eccentric-concentric (ISO-ECC-CON) condition, isometric pre-activation was conducted before exhibiting the ECC-CON maneuver. Joint torque and fascicle length of the medial gastrocnemius were compared. The joint torque at the onset and end of shortening was larger in the ISO-ECC-CON than in the ISO-CON or ECC-CON conditions, while no differences were found between ISO-CON and ECC-CON conditions. The magnitude of fascicle elongation attained during the active stretch was larger in the ISO-ECC-CON than in the ECC-CON condition. This could be caused by the shorter fascicle length at the onset of active stretch due to isometric pre-activation. This shorter fascicle length could lead to larger fascicle elongation during the subsequent active stretch, which should emphasize the effect of active stretch-induced force enhancement mechanism.
Identifiants
pubmed: 31862776
pii: 8/12/bio044651
doi: 10.1242/bio.044651
pmc: PMC6955218
pii:
doi:
Types de publication
Journal Article
Langues
eng
Informations de copyright
© 2019. Published by The Company of Biologists Ltd.
Déclaration de conflit d'intérêts
Competing interestsThe authors declare no competing or financial interests.
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