Kasper Gejl

Did You Know: Erythropoiesis Is Regulated by Changes in Posture - Mazza - 2026 - Acta Physiologica - Wiley Online Library onlinelibrary.wiley.com/doi/10.1111/ap…

onlinelibrary.wiley.com/doi/10.1111/sm… although the winter Olympics are over, you may still find some of the considerations of interest in terms of glycogen and CHO fuelling for cross country skiing performance

Persistent Improvements in Running Economy With Advanced Footwear Technology During Prolonged Running in Trained Male Runners onlinelibrary.wiley.com/doi/10.1111/sm…

@LoreofRunning1 My comment was not about the Bergström study but about conclusions regarding glycogen not supported by glycogen measurements. "Prolonged exercise" could perhaps be specified then, as the study design IMO challenges application of the findings to performance in endurance athletes

Hi Kasper @KasperGejl. What we actually proved was that prevention of hypoglycaemia with the ingestion of 10g CHO/hr improved endurance performance whereas ingesting a large amount of carbohydrate in the 6 weeks before exercise was no more beneficial than ingesting a little during those six weeks. Those are the real data. Just for interest, how would you explain those findings? This was a study of mechanisms of fatigue during prolonged exercise not of “modern endurance sport competitions”. I’m sure that when you tell your athletes/students about the original 1967 study by Bergstrom et al (JAP) which established the hypothesis that muscle glycogen is obligatory for human exercise performance, you’re certain to remind them also that the (elite) athletes in that study were recreationally active Phys Ed students in the Department at that time (ie a convenience sample) and that they exercised at “a rather low intensity steady state exercise - far from modern sport competitions”. Or perhaps not? @PhilipPrins11 @AKoutnik @ProfTimNoakes

A new study claims that muscle glycogen isn´t obligatory for endurance performance - without actually measuring it! Plus, performance was tested in a fasted state at rather low-intensity steady state exercise - far from modern endurance sport competitions pubmed.ncbi.nlm.nih.gov/39786965/

New preprint from our group. We employed transmission electron microscopy to explore the amount of physical contact between mitochondria and lipid droplets in skeletal muscles of untrained subjects vs. elite endurance athletes biorxiv.org/content/10.110… @nortenblad @SamShep_ExSci

Only 8 weeks resistance training🏋️ effectively enhances the muscles ability to regulate intracellular calcium in elite rowers. This likely benefits muscle contraction speed and relaxation during strokes⚡️🚣‍♀️. Great work @nortenblad, @JoachimNielsen6 et al💪doi.org/10.1111/sms.70…

A new RCT from @SDUIOB is now online, showing a dose-response relationship between training intensity and changes in VO2max in adolescents. Interestingly, changes in VO2max were associated with changes in inhibitory control (OA👇). @SDUmuscle onlinelibrary.wiley.com/doi/10.1111/sm…

Recent study from Ríos et al. (hubs.la/Q02G10pn0) demonstrates how #AI can be used to estimate the subcellular distribution of glycogen granules. Nielsen @JoachimNielsen6 @SyddanskUni provides commentary: hubs.la/Q02G10Rk0

PhD Scholarship in Human physiology, Environmental Health and Climate Change (ku.dk) employment.ku.dk/phd/?show=1621…

New results from the SCREENS trial!💻📱🖥️ Reducing leisure-time screen media use in families improves behavioral difficulties and enhances prosocial behavior of children and adolescents! @AndersNtved @SDUIOB @ERC_Research @JAMANetworkOpen #mentalhealth jamanetwork.com/journals/jaman…

New research project coming up with Carsten Lundby! Head High / Feet Low for increased hemoglobin mass? @SDUIOB @nortenblad @teamdanmark @JoachimNielsen6 @OscarMazza18

På SDU har vi stort fokus på, at vores forskning skaber værdi for samfundet. Derfor er det en stor glæde, at @kommunerne's forebyggelsespris i år går til @SlagelseKommune, der har implementeret forskning udført af SDU-professor Paolo Caserotti. #dksund sdu.dk/da/om_sdu/inst…

Excited to share the news of my first accepted paper from my Ph.D. project, discussion what we should consider when we classify physical activity intensity in older adults. @MarkATully @AnnemarieKo @nortenblad @KasperGejl @geronsociety @oxfordjournals bit.ly/4bqGVze

@CSchytz, @nortenblad, @KasperGejl and @JoachimNielsen6 (Department of Sports Science and Clinical Biomechanics, @UniSouthDenmark) investigate the differential utilisation of subcellular skeletal muscle glycogen pools! 📜buff.ly/3JwoInJ

An incredible journey discovering new aspects of subcellular localization of glycogen particles in skeletal muscle! Do exercise intensity and CHO intake play a role? physoc.onlinelibrary.wiley.com/share/K2TEGWW4… Thanks to the editors and reviewers. @CSchytz @KasperGejl @nortenblad

New article from my PhD in @JPhysiol! physoc.onlinelibrary.wiley.com/doi/full/10.11… We compared utilization of the three subcellular pools of glycogen during 1- and 15-min maximal exercise. 1/5

Sprint performance and maximal aerobic exercise performance were impaired following 4 h of intermittent exercise and these deteriorations were not strongly correlated with neither substrate utilization during exercise nor laboratory-based measures obtained in the fresh condition.

Substrate utilization and durability during prolonged intermittent exercise in elite road cyclists (open access) doi.org/10.1007/s00421…

@GiacomoCasadei4 @nortenblad @JoachimNielsen6 Actually we are. We have a couple of invasive projects including biopsies in the pipeline to be conducted in the near future. Here the CHO dosis will be manipulated. Stay tuned 👍

@KasperGejl @nortenblad @JoachimNielsen6 are you planning to follow up this study by diversifying the CHO intake? say 80/100/120g per hour...I am really curious to see if it would have any impact on durability

Does durability in elite cyclists rely on fat oxidation during exercise with a high CHO intake? Under the conditions of our new study, durability could not be predicted by measures of fat oxidation or classic measures of perf. rdcu.be/dAtXC @nortenblad @JoachimNielsen6