Vis enkel innførsel

dc.contributor.authorSylta, Øystein
dc.contributor.authorSandbakk, Øyvind
dc.contributor.authorHammarström, Daniel
dc.contributor.authorDanielsen, Jørgen
dc.contributor.authorSkovereng, Knut
dc.contributor.authorRønnestad, Bent
dc.contributor.authorSeiler, Stephen
dc.contributor.authorTønnesen, Espen
dc.date.accessioned2018-01-23T10:04:36Z
dc.date.available2018-01-23T10:04:36Z
dc.date.created2017-08-04T12:51:31Z
dc.date.issued2017
dc.identifier.citationMedicine & Science in Sports & Exercise. 2017, 49 (6), 1137-1146.nb_NO
dc.identifier.issn0195-9131
dc.identifier.urihttp://hdl.handle.net/11250/2478970
dc.description.abstractPURPOSE: Investigate development of specific performance adaptions and hormonal responses every fourth week during a 12-wk high-intensity training (HIT) period in groups with different interval-training prescriptions. METHODS: Sixty-three well-trained cyclists performing a 12-wk intervention consisting of two to three HIT sessions per week in addition to ad libitum low-intensity training. Groups were matched for total training load, but increasing HIT (INC) group (n = 23) performed interval-sessions as 4 × 16 min in weeks 1-4, 4 × 8 min in weeks 5-8, and 4 × 4 min in weeks 9-12. Decreasing HIT (DEC) group (n = 20) performed interval sessions in the opposite order as INC, and mixed HIT (MIX) group (n = 20) performed all interval-sessions in a mixed distribution during 12 wk. Cycling-tests and measures of resting blood hormones were conducted pre, weeks 4, 8, and 12. RESULTS: INC and MIX achieved >70% of total change in workload eliciting 4 mmol·L [la] (Power4mM) and V˙O2peak during weeks 1-4, versus only 34%-38% in DEC. INC induced larger improvement versus DEC during weeks 1-4 in Power4mM (effect size, 0.7) and V˙O2peak (effect size, 0.8). All groups increased similarly in peak power output during weeks 1-4 (64%-89% of total change). All groups' pooled, total and free testosterone and free testosterone/cortisol ratio decreased by 22% ± 15%, 13% ± 23%, and 14% ± 31% (all P < 0.05), and insulin-like growth factor-1 increased by 10% ± 14% (P < 0.05) during weeks 1-4. CONCLUSIONS: Most of progression in Power4mM, V˙O2peak and peak power output was achieved during weeks 1-4 in INC and MIX, and accompanied by changes in resting blood hormones consistent with increased but compensable stress load. In these well-trained subjects, accumulating 2-3 h·wk performing 4 × 16 min work bouts at best effort induces greater adaptions in Power4mM and V˙O2peak than accumulating ~1 h·wk performing best effort intervals as 4 × 4 min.nb_NO
dc.language.isoengnb_NO
dc.publisherKluwernb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleEffects of high-intensity training on physiological and hormonal adaptions in well-trained cyclistsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.pagenumber1137-1146nb_NO
dc.source.volume49nb_NO
dc.source.journalMedicine & Science in Sports & Exercisenb_NO
dc.source.issue6nb_NO
dc.identifier.doi10.1249/MSS.0000000000001214
dc.identifier.cristin1484212
dc.description.localcodenivå2
cristin.unitcode201,18,2,0
cristin.unitnameInstitutt for folkehelse, idrett og ernæring
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel

Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Med mindre annet er angitt, så er denne innførselen lisensiert som Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal