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  • Gejl, Kasper DegnUniv Southern Denmark, Dept Sports Sci & Clin Biomech, Odense M, Denmark,University of Southern Denmark (author)

No Superior Adaptations to Carbohydrate Periodization in Elite Endurance Athletes

  • Article/chapterEnglish2017

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  • 2017
  • electronicrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:miun-32564
  • https://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-32564URI
  • https://doi.org/10.1249/MSS.0000000000001377DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-84509URI
  • http://kipublications.ki.se/Default.aspx?queryparsed=id:137128337URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-5005URI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

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  • Purpose The present study investigated the effects of periodic carbohydrate (CHO) restriction on endurance performance and metabolic markers in elite endurance athletes. Methods Twenty-six male elite endurance athletes (maximal oxygen consumption (VO2max), 65.0 mL O(2)kg(-1)min(-1)) completed 4 wk of regular endurance training while being matched and randomized into two groups training with (low) or without (high) CHO manipulation 3 dwk(-1). The CHO manipulation days consisted of a 1-h high-intensity bike session in the morning, recovery for 7 h while consuming isocaloric diets containing either high CHO (414 2.4 g) or low CHO (79.5 1.0 g), and a 2-h moderate bike session in the afternoon with or without CHO. VO2max, maximal fat oxidation, and power output during a 30-min time trial (TT) were determined before and after the training period. The TT was undertaken after 90 min of intermittent exercise with CHO provision before the training period and both CHO and placebo after the training period. Muscle biopsies were analyzed for glycogen, citrate synthase (CS) and -hydroxyacyl-coenzyme A dehydrogenase (HAD) activity, carnitine palmitoyltransferase (CPT1b), and phosphorylated acetyl-CoA carboxylase (pACC). Results The training effects were similar in both groups for all parameters. On average, VO2max and power output during the 30-min TT increased by 5% +/- 1% (P < 0.05) and TT performance was similar after CHO and placebo during the preload phase. Training promoted overall increases in glycogen content (18% +/- 5%), CS activity (11% +/- 5%), and pACC (38% +/- 19%; P < 0.05) with no differences between groups. HAD activity and CPT1b protein content remained unchanged. Conclusions Superimposing periodic CHO restriction to 4 wk of regular endurance training had no superior effects on performance and muscle adaptations in elite endurance athletes.

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  • Thams, Line BorkUniv Southern Denmark, Dept Sports Sci & Clin Biomech, Odense M, Denmark,University of Southern Denmark (author)
  • Hansen, MetteAarhus Univ, Sect Sport Sci, Dept Publ Hlth, Aarhus, Denmark,Aarhus University, Aarhus, Denmark (author)
  • Rokkedal-Lausch, TorbenAalborg Univ, Dept Hlth Sci & Technol, SMI, Fac Med, Aalborg, Denmark,Aalborg University, Aalborg, Denmark (author)
  • Plomgaard, PeterRigshosp, Dept Clin Biochem, Copenhagen, Denmark; Univ Copenhagen, Dept Infect Dis, Ctr Phys Act Res, Rigshosp, Copenhagen, Denmark,Rigshospitalet, Copenhagen, Denmark (author)
  • Nybo, LarsUniv Copenhagen, Dept Nutr Exercise & Sports, Copenhagen, Denmark,University of Copenhagen, Copenhagen Denmark (author)
  • Larsen, Filip JGymnastik- och idrottshögskolan,Karolinska Institutet,Forskningsgruppen Mitokondriell funktion och metabol kontroll,Karolinska Institute(Swepub:gih)filipl (author)
  • Cardinale, Daniele AGymnastik- och idrottshögskolan,Forskningsgruppen Mitokondriell funktion och metabol kontroll(Swepub:gih)danielec (author)
  • Jensen, KurtUniv Southern Denmark, Dept Sports Sci & Clin Biomech, Odense M, Denmark,University of Southern Denmark (author)
  • Holmberg, Hans-Christer,1958-Mittuniversitetet,Avdelningen för hälsovetenskap,Swedish Olymp Comm, Stockholm,Mittuniversitetet, Avdelningen för hälsovetenskap,Mid Sweden University, Östersund, Sweden(Swepub:ltu)holhan (author)
  • Vissing, KristianAarhus Univ, Sect Sport Sci, Dept Publ Hlth, Aarhus, Denmark,Aarhus University, Aarhus, Denmark (author)
  • Ørtenblad, NielsMittuniversitetet,Avdelningen för hälsovetenskap,Univ Southern Denmark, Dept Sports Sci & Clin Biomech, Odense M, Denmark,Mittuniversitetet, Avdelningen för hälsovetenskap,University of Southern Denmark(Swepub:miun)nieort (author)
  • Univ Southern Denmark, Dept Sports Sci & Clin Biomech, Odense M, DenmarkUniversity of Southern Denmark (creator_code:org_t)

Related titles

  • In:Medicine & Science in Sports & Exercise49:12, s. 2486-24970195-91311530-0315

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