Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Effects of prolonged low intensity exercise with energy deficit (military training operation) on markers of muscle protein turnover.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences. (Forskningsgruppen för fysisk aktivitet, prestation och hälsa)ORCID iD: 0000-0002-0642-4838
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Åstrand Laboratory of Work Physiology, Björn Ekblom's and Mats Börjesson's research group.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Åstrand Laboratory of Work Physiology.ORCID iD: 0000-0001-5885-2378
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Åstrand Laboratory of Work Physiology.
Show others and affiliations
2015 (English)Conference paper, Abstract (Refereed)
Abstract [en]

Introduction

It is well known that ultra-endurance exercise, such as Adventure racing and military operations, often induce substantial energy deficits. This suggests a catabolic state, but the exact effects on protein turnover have not yet been sufficiently investigated. The aim of this study was to examine several markers involved in muscle protein turnover before and after a multi-day physically demanding military training operation.

Methods

Seven female (age 21 ± 5 years, weight 71.2 ± 6.6 kg) and seventeen male (age 20 ± 1 years, weight 76.6 ± 6.2 kg) performed a 185 hours military training operation. Energy intake was estimated from food supply and energy expenditure was calculated from continuous heart rate and accelerometer recordings. Muscle biopsies were taken from M Vastus Lateralis before and after the operation.

Results

A negative energy balance of 1,500-2,000 kcal/24 hours was estimated. Body weight declined 3.4 (95% CI 3.0-3.8) kg and muscle explosive strength, evaluated from squad and counter movement jumps, was reduced 5 and 6 %, respectively, after the operation with no difference between genders. Muscle glycogen content was reduced from 269 ± 58 to 181 ± 44 mmol/kg dry muscle (p<0.05) with no difference between genders. Muscle content of mTOR and p70 as well as MAFbx were unchanged while the protein content of MuRF-1 was significantly down regulated in both genders.

Discussion

The study indicated that prolonged low intensity exercise with substantial energy deficit reduces muscle function and muscle glycogen content. Proteins for muscle synthesis mTOR and p70 were unchanged while the down regulation of MuRF-1 indicates a protection against muscle break down during the energy deficit situation, preserving the muscle mass.

Place, publisher, year, edition, pages
2015.
Keyword [en]
Protein turnover, energy deficit, ultra-endurance
National Category
Physiology Cell and Molecular Biology
Research subject
Medicine/Technology
Identifiers
URN: urn:nbn:se:gih:diva-3960OAI: oai:DiVA.org:gih-3960DiVA: diva2:844367
Conference
ECSS, 20th Annual Congress of the European College of Sport Science, Malmö 24-27 June 2015
Available from: 2015-08-05 Created: 2015-08-05 Last updated: 2015-09-17Bibliographically approved

Open Access in DiVA

No full text

Other links

Book of abstracts

Search in DiVA

By author/editor
Mattsson, C. MikaelSöderlund, Karin
By organisation
Department of Sport and Health SciencesBjörn Ekblom's and Mats Börjesson's research groupÅstrand Laboratory of Work Physiology
PhysiologyCell and Molecular Biology

Search outside of DiVA

GoogleGoogle Scholar

Total: 448 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf