Show simple item record

dc.contributor.authorWerkhausen, A
dc.contributor.authorAlbracht, K
dc.contributor.authorCronin, NJ
dc.contributor.authorPaulsen, G
dc.contributor.authorBojsen-Møller, J
dc.contributor.authorSeynnes, OR
dc.date.accessioned2019-06-14T01:32:27Z
dc.date.available2019-06-14T01:32:27Z
dc.date.issued2018
dc.identifier.issn1664-042X
dc.identifier.doi10.3389/fphys.2018.00794
dc.identifier.urihttp://hdl.handle.net/10072/385175
dc.description.abstractDuring rapid deceleration of the body, tendons buffer part of the elongation of the muscle-tendon unit (MTU), enabling safe energy dissipation via eccentric muscle contraction. Yet, the influence of changes in tendon stiffness within the physiological range upon these lengthening contractions is unknown. This study aimed to examine the effect of training-induced stiffening of the Achilles tendon on triceps surae muscle-tendon behavior during a landing task. Twenty-one male subjects were assigned to either a 10-week resistance-training program consisting of single-leg isometric plantarflexion (n = 11) or to a non-training control group (n = 10). Before and after the training period, plantarflexion force, peak Achilles tendon strain and stiffness were measured during isometric contractions, using a combination of dynamometry, ultrasound and kinematics data. Additionally, testing included a step-landing task, during which joint mechanics and lengths of gastrocnemius and soleus fascicles, Achilles tendon, and MTU were determined using synchronized ultrasound, kinematics and kinetics data collection. After training, plantarflexion strength and Achilles tendon stiffness increased (15 and 18%, respectively), and tendon strain during landing remained similar. Likewise, lengthening and negative work produced by the gastrocnemius MTU did not change detectably. However, in the training group, gastrocnemius fascicle length was offset (8%) to a longer length at touch down and, surprisingly, fascicle lengthening and velocity were reduced by 27 and 21%, respectively. These changes were not observed for soleus fascicles when accounting for variation in task execution between tests. These results indicate that a training-induced increase in tendon stiffness does not noticeably affect the buffering action of the tendon when the MTU is rapidly stretched. Reductions in gastrocnemius fascicle lengthening and lengthening velocity during landing occurred independently from tendon strain. Future studies are required to provide insight into the mechanisms underpinning these observations and their influence on energy dissipation.
dc.description.peerreviewedYes
dc.publisherFrontiers
dc.relation.ispartofissueJUN
dc.relation.ispartofjournalFrontiers in Physiology
dc.relation.ispartofvolume9
dc.subject.fieldofresearchZoology
dc.subject.fieldofresearchMedical physiology
dc.subject.fieldofresearchPsychology
dc.subject.fieldofresearchcode3109
dc.subject.fieldofresearchcode3208
dc.subject.fieldofresearchcode52
dc.titleEffect of training-induced changes in Achilles tendon stiffness on muscle-tendon behavior during landing
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
dc.description.versionVersion of Record (VoR)
gro.rights.copyright© 2018 Frontiers in Physiology. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.hasfulltextFull Text
gro.griffith.authorCronin, Neil


Files in this item

This item appears in the following Collection(s)

  • Journal articles
    Contains articles published by Griffith authors in scholarly journals.

Show simple item record