Näytä suppeat kuvailutiedot

dc.contributor.authorWalker, Simon
dc.contributor.authorHäkkinen, Keijo
dc.contributor.authorHaff, Guy Gregory
dc.contributor.authorBlazevich, Anthony J.
dc.contributor.authorNewton, Robert U.
dc.date.accessioned2017-04-19T10:08:14Z
dc.date.available2017-04-19T10:08:14Z
dc.date.issued2017
dc.identifier.citationWalker, S., Häkkinen, K., Haff, G. G., Blazevich, A. J., & Newton, R. U. (2017). Acute elevations in serum hormones are attenuated after chronic training with traditional isoinertial but not accentuated eccentric loads in strength-trained men. <em>Physiological Reports</em>, 5 (7), e13241. <a href="https://doi.org/10.14814/phy2.13241">doi:10.14814/phy2.13241</a>
dc.identifier.otherTUTKAID_73541
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/53623
dc.description.abstractIt has been proposed that the maintenance of acute hormonal responses reveal an efficacy of a training stimulus to evoke ongoing increases in strength and muscle mass. We previously observed that maximum strength continued to improve throughout a 10‐week period in an accentuated eccentric loading group (AEL) but not a traditional isoinertial loading (ISO) group. Therefore, this study investigated whether the magnitude of acute hormonal responses was greater (i.e., maintained) in AEL compared to ISO at the end of the training period. Subjects in AEL (eccentric load = concentric load + 40%) and ISO performed experimental loading tests (three sets of 10 repetitions in the leg press and knee extension exercises) during weeks 2 and 9 of the training period. Blood samples collected during these experimental loadings were analyzed for serum testosterone, growth hormone and cortisol concentrations. Maximum isometric knee extension torque (MVC) and lower‐limb lean mass were assessed before and after 5 and 10 weeks of training. Acute testosterone, growth hormone and cortisol responses to traditional isoinertial loading were reduced at the end of the training period but were not reduced after accentuated eccentric load training (P < 0.05‒0.1 between‐groups). Increases in MVC and lower‐limb lean mass over weeks 6‒10 were greater in AEL compared to ISO (MVC: 7.3 ± 5.4 vs. −0.4 ± 7.2%, P = 0.026 for between‐group difference; lower‐limb lean mass: 1.6 ± 2.2 vs. −0.2 ± 1.4%, P = 0.063 for between‐group difference). The maintenance of acute hormonal responses and continued strength gain in AEL but not ISO are consistent with the hypothesis that maintained acute responses indicate an efficacy of a training stimulus to evoke ongoing adaptation. However, since relationships between hormonal responses and training‐induced adaptations were not statistically significant, the data suggest that tracking of acute hormonal responses on an individual level may not provide a sensitive enough guide for decisions regarding program design and periodization.
dc.language.isoeng
dc.publisherWiley Periodicals, Inc. on behalf of the American Physiological Society and the Physiological Society
dc.relation.ispartofseriesPhysiological Reports
dc.subject.otherhypertrophy
dc.subject.otheroverload
dc.subject.otherprogression
dc.subject.otherresistance
dc.titleAcute elevations in serum hormones are attenuated after chronic training with traditional isoinertial but not accentuated eccentric loads in strength-trained men
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201704182007
dc.contributor.laitosLiikuntatieteellinen tiedekuntafi
dc.contributor.laitosFaculty of Sport and Health Sciencesen
dc.contributor.oppiaineValmennus- ja testausoppi
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.identifier.doi10.14814/phy2.13241
dc.date.updated2017-04-18T06:15:04Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.relation.issn2051-817X
dc.relation.volume5
dc.type.versionpublishedVersion
dc.rights.copyright© 2017 The Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License.
dc.rights.accesslevelopenAccessfi
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/


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© 2017 The Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License.
Ellei muuten mainita, aineiston lisenssi on © 2017 The Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License.