Tomas Urianstad Odden

• Odden, Ingvill; Hamarsland, Håvard; Urianstad, Tomas; Hammarström, Jens Konrad Daniel; Rustaden, Anne Mette & Koll, Lise [Show all 13 contributors for this article] (2026). Limited reproducibility of individual physiological adaptations to repeated endurance exercise training. Journal of applied physiology. ISSN 8750-7587. 141(1), p. 38–57. doi: 10.1152/japplphysiol.00154.2026. Full text in Research Archive
• Rønnestad, Bent; Urianstad, Tomas; Blindheim, Petter Maurseth; Hansen, Joar; Hamarsland, Håvard & Ellefsen, Stian [Show all 8 contributors for this article] (2026). Heat training augments hemoglobin mass during a moderate-altitude training camp in well-trained endurance athletes. Journal of applied physiology. ISSN 8750-7587. 140(5), p. 1298–1310. doi: 10.1152/japplphysiol.00777.2025. Full text in Research Archive
• Rønnestad, Bent; Odden, Ingvill; Urianstad, Tomas; Hansen, Joar; Mølmen, Knut Sindre & Cardinale, Daniele A. (2024). Heat Suit Training Preserves the Increased Hemoglobin Mass Following Altitude Camp in Elite Cyclists. Medicine & Science in Sports & Exercise. ISSN 0195-9131. doi: 10.1249/MSS.0000000000003542. Full text in Research Archive
• Urianstad, Tomas; Hamarsland, Håvard; Odden, Ingvill; Lorentzen, Håvard Crantz; Hammarström, Jens Konrad Daniel & Mølmen, Knut Sindre [Show all 7 contributors for this article] (2024). The higher oxygen consumption during multiple short intervals is sex-independent and not influenced by skeletal muscle characteristics in well-trained cyclists. European Journal of Sport Science (EJSS). ISSN 1746-1391. doi: 10.1002/ejsc.12214. Full text in Research Archive Show summary

  It has been suggested that time spent at a high fraction of maximal oxygen consumption (%mathematical equationO2max) plays a decisive role for adaptations to interval training. However, previous studies examining how interval sessions should be designed to achieve a high %mathematical equationO2max have exclusively been performed in males. The present study compared the %mathematical equationO2max attained during three different 6 × 8 min interval protocols, in female (n = 11; mathematical equationO2max, 62.5 (6.4) mL · min−1·kg−1) and male (n = 8; mathematical equationO2max, 81.0 (5.2) mL · min−1·kg−1) cyclists. Mean power output during work intervals were identical across the three interval protocols, corresponding to the cyclist's 40 min maximal effort (PO40min): (1) 30 s intervals at 118% of PO40min interspersed with 15 s active recovery at 60% (30/15), (2) constant pace at 100% of PO40min (CON), and (3) altering between 60 s intervals at 110% and 60 s at 90% of PO40min (60/60). Additionally, the study explored whether the m. vastus lateralis characteristics of the cyclists (fiber type proportion, capillarization, and citrate synthase activity) were associated with the %mathematical equationO2max attained during the interval sessions. Overall, mean %mathematical equationO2max and time ≥90% of mathematical equationO2max were higher during 30/15 compared to CON (86.7 (10.1)% and 1123 (787) s versus 85.0 (10.4)% and 879 (779) s, respectively; both p ≤ 0.01) and 60/60 (85.6 (10.0)% and 917 (745) s, respectively; both p ≤ 0.05), while no difference was observed between 60/60 and CON (both p ≥ 0.36). During interval sessions, %mathematical equationO2max and time ≥90% of mathematical equationO2max did not differ between sexes. Skeletal muscle characteristics were not related to %mathematical equationO2max during interval sessions. In conclusion, well-trained cyclists demonstrate highest %mathematical equationO2max during 30/15, irrespective of sex and skeletal muscle characteristics.

• Odden, Ingvill; Nymoen, Lars; Urianstad, Tomas; Kristoffersen, Morten; Hammarström, Jens Konrad Daniel & Hansen, Joar [Show all 8 contributors for this article] (2024). The higher the fraction of maximal oxygen uptake is during interval training, the greater is the cycling performance gain. European Journal of Sport Science (EJSS). ISSN 1746-1391. 24(11), p. 1583–1596. doi: 10.1002/ejsc.12202. Full text in Research Archive Show summary

  It has been suggested that time at a high fraction (%) of maximal oxygen uptake (VO2max) plays a decisive role for adaptations to interval training. Yet, no study has, to date, measured the % of VO2max during all interval sessions throughout a prolonged training intervention and subsequently related it to the magnitude of training adaptations. Thus, the present study aimed to investigate the relationship between % of VO2max achieved during an interval training intervention and changes in endurance performance and its physiological determinants in well-trained cyclists. Twenty-two cyclists (VO2max 67.1 (6.4) mL·min−1 ·kg−1; males, n = 19; females, n = 3) underwent a 9-week interval training intervention, consisting 21 sessions of 5 × 8-min intervals conducted at their 40-min highest sustainable mean power output (PO). Oxygen uptake was measured during all interval sessions, and the relationship between % of VO2max during work intervals and training adaptations were investigated using linear regression. A performance index was calculated from several performance measures. With higher % of VO2max during work intervals, greater improvements were observed for maximal PO during the VO2max test (R2adjusted = 0.44, p = 0.009), PO at 4 mmol·L−1 [blood lactate] (R2adjusted = 0.25, p = 0.035), the performance index (R2adjusted = 0.36, p = 0.013), and VO2max (R2adjusted = 0.54, p = 0.029). Other measures, such as % of maximal heart rate, were related to fewer outcome variables and exhibited poorer session-to-session repeatability compared to % of VO2max. In conclusion, improvements in endurance measures were positively related to the % of VO2max achieved during interval training. Percentage of VO2max was the measure that best reflected the magnitude of training adaptations.

• Urianstad, Tomas; Villanova, Simone; Odden, Ingvill; Hansen, Joar; Mølmen, Knut Sindre & Porcelli, Simone [Show all 8 contributors for this article] (2024). Carbon monoxide supplementation: evaluating its potential to enhance altitude training effects and cycling performance in elite athletes. Journal of applied physiology. ISSN 8750-7587. 137(5), p. 1092–1105. doi: 10.1152/japplphysiol.00469.2024. Full text in Research Archive
• Rønnestad, Bent; Urianstad, Thomas; Hamarsland, Håvard; Hansen, Joar; Nygård, Håvard & Ellefsen, Stian [Show all 8 contributors for this article] (2022). Heat Training Efficiently Increases and Maintains Hemoglobin Mass and Temperate Endurance Performance in Elite Cyclists. Medicine & Science in Sports & Exercise. ISSN 0195-9131. 54(9), p. 1515–1526. doi: 10.1249/MSS.0000000000002928. Full text in Research Archive
• Duc, Sébastien; Urianstad, Thomas & Rønnestad, Bent (2022). Adding Vibration During Varied-Intensity Work Intervals Increases Time Spent Near Maximal Oxygen Uptake in Well-Trained Cyclists. International Journal of Sports Physiology and Performance (IJSPP). ISSN 1555-0265. 17(11), p. 1565–1573. doi: 10.1123/ijspp.2021-0572. Full text in Research Archive
• Lundby, Carsten; Svendsen, Ida Siobhan; Urianstad, Thomas; Hansen, Joar & Rønnestad, Bent (2021). Training wearing thermal clothing and training in hot ambient conditions are equally effective methods of heat acclimation. Journal of Science and Medicine in Sport. ISSN 1440-2440. 24(8), p. 763–767. doi: 10.1016/j.jsams.2021.06.005. Full text in Research Archive Show summary

  The objective was to compare the efficacy of three different heat acclimation protocols to improve exercise performance in the heat. Thirty four cyclists completed one of three 10-day interventions 1) 50-min cycling per day in 35 °C, 2) 50-min cycling per day wearing thermal clothing, and 3) 50-min cycling wearing thermal clothing plus 25 min hot water immersion per day. Pre- and post-intervention hemoglobin mass, intravascular volumes and core temperature were determined at rest. Heart rate, sweat rate, blood lactate concentration and core temperature were evaluated during 15-min submaximal and 30-min all-out cycling performance conducted in 35.2 ± 0.1 °C and 61 ± 1% relative humidity. There were no significant between-group differences in any of the determined variables. None of the interventions statistically altered any of the parameters investigated as part of the 15-min submaximal trial. However, following the intervention period, heat chamber, thermal clothing and thermal clothing + hot water immersion all improved 30-min all-out average power in the heat (9.5 ± 3.8%, 9.5 ± 3.6 and 9.9 ± 5.2%, respectively, p < 0.001, F = 192.3). At termination of the 30-min all-out test, the increase in blood lactate concentration, rate of perceived exertion and sweat rate were not different between the three interventions. In conclusion, daily training sessions conducted either in ambient 35 °C, while wearing thermal clothing in temperate conditions or while wearing thermal clothing combined with hot water immersion are equally effective for improving exercise performance in the heat.

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• Odden, Ingvill Urianstad; Hamarsland, Håvard; Odden, Tomas Urianstad; Hammarström, Daniel; Rogneflåten, Torkil & Hansen, Joar [Show all 12 contributors for this article] (2025). Individual responses to 8 weeks of aerobic interval training are partially reproducible. Full text in Research Archive
• Odden, Tomas Urianstad (2025). Treningstrenden «japanese walking» gjorde det bedre enn skrittelleren. [Journal]. Nettavisen. Full text in Research Archive
• Odden, Tomas Urianstad (2025). Confounders of the hematological ABP: heat training and CO-supplementation. Full text in Research Archive
• Urianstad, Tomas; Odden, Ingvill; Hamarsland, Håvard; Hammarström, Daniel; Rogneflåten, Torkil & Hansen, Joar [Show all 11 contributors for this article] (2025). Comparable absolute VO2max gains between middle-aged females and males, but greater percentage increases in females during and after 11 months of aerobic exercise training. Full text in Research Archive
• Grindaker, Eirik; Odden, Tomas Urianstad; Mølmen, Knut Sindre; Smidesang, Ole & Lognseth, Stig (2024). Forskning: REPEAT-prosjektet. doi: https:/api.spreaker.com/v2/episodes/62369886/download.mp3. Full text in Research Archive Show summary

  Når vi trener utholdenhets- og styrketrening forbedrer vi kroppens evne til energiomsetning og kraftutvikling, hvorav begge faktorene er avgjørende for opprettholdelse av god helse og normal kroppslig funksjon. Imidlertid ser man at hvor stor effekt man oppnår varierer mellom personer, til tross for at man utsetter kroppen for det samme arbeidet. REPEAT er et stort forskningsprosjekt som tar for seg nettopp denne tematikken, og som søker å besvare viktige spørsmål som: 1) I hvilken grad responderer samme person likt på trening når treningen gjentas flere ganger over tid? 2) Hvordan utvikler treningseffektene seg over tid, og hva bestemmer hvor stor effekt man oppnår? 3) Er det en sammenheng mellom de som responderer godt på utholdenhetstrening og de som får gode resultater av styrketrening? 4) Hva kjennetegner de som lykkes med å fullføre treningen i prosjektet og fortsetter å trene etter at det er avsluttet?

• Urianstad, Tomas; Rønnestad, Bent; Odden, Ingvill; Hansen, Joar; Mølmen, Knut Sindre & Cardinale, Daniele (2024). Heat suit training maintains the increased haemoglobin mass after altitude training camp in elite cyclists. Full text in Research Archive
• Grindaker, Eirik; Mølmen, Knut Sindre; Urianstad, Tomas & Smidesang, Ole A. (2024). Podkasten "Trening": REPEAT-prosjektet. [Radio]. https://open.spotify.com/show/0sJE4calRK0O9gsrTyVpMX. Full text in Research Archive
• Odden, Ingvill; Urianstad, Tomas & Mølmen, Knut Sindre (2024). Snart får Trond Harald sannheten på papiret. [Journal]. Gudbrandsdølen Dagningen (GD). Full text in Research Archive
• Odden, Ingvill; Nymoen, Lars Østli; Urianstad, Tomas; Hammarström, Daniel; Mølmen, Knut Sindre & Rønnestad, Bent (2023). The higher fraction of V̇O2max during interval training, the greater gains in performance. Full text in Research Archive

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