Thomas Birkedal Stenqvist

• Stenqvist, Thomas Birkedal & Bere, Elling Tufte (2024). How traditional Norwegian outdoor activities are changing; a 10-year follow up in relation to sociodemographic factors. Frontiers in Sports and Active Living. ISSN 2624-9367. 6. doi: 10.3389/fspor.2024.1355776. Fulltekst i vitenarkiv
• Østrem, Ketil & Stenqvist, Thomas Birkedal (2024). Å ta gode og trygge beslutninger i friluftsliv. I Røynesdal, Øystein & Thorjussen, Ingfrid M. (Red.), Kroppsøving i praksis: læreplanbegreper, klasseledelse og undervisningsmetode. Universitetsforlaget. ISSN 9788215063744. s. 125–141.
• Stenqvist, Thomas Birkedal; Melin, Anna Katarina & Torstveit, Monica Klungland (2023). Relative Energy Deficiency in Sport (REDs) Indicators in Male Adolescent Endurance Athletes: A 3-Year Longitudinal Study. Nutrients. ISSN 2072-6643. 15(24). doi: 10.3390/nu15245086. Fulltekst i vitenarkiv
• Stenqvist, Thomas Birkedal & Øvrevik, Geir (2023). Energy balance during outdoor education winter training: a pilot study. Journal of Adventure Education and Outdoor Learning. ISSN 1472-9679. doi: 10.1080/14729679.2023.2196639. Fulltekst i vitenarkiv Vis sammendrag

  Learning in the mountains during winter prepares upcoming guides for tough environments by placing demands on their energy intake and enabling them to cope with a complex environment. However, few studies have explored energy intake and expenditure in outdoor education. Thus, energy intake during a 24-hour winter mountain course was investigated in a Norwegian educational context, where students must absorb large volumes of information in a challenging environment. Twenty university students (11 men, 9 women) underwent body composition, weighed energy intake, and accelerometry-based energy expenditure measurements. Overall, the students had an energy deficit of>2,300 kilo-calories/day, corresponding to an energy balance of 62% for men and 54% for women (p > 0.05), despite having received lectures on energy requirements in advance. This sustained stress context combined with challenging environmental conditions and insufficient energy intake can predispose students to early exhaustion, injury risk, and potentially reduced information processing that may limit learning

• Lundy, Bronwen; Torstveit, Monica Klungland; Stenqvist, Thomas Birkedal; Burke, Louise M.; Garthe, Ina & Slater, Gary [Vis alle 8 forfattere av denne artikkelen] (2022). Screening for Low Energy Availability in Male Athletes: Attempted Validation of LEAM-Q. Nutrients. ISSN 2072-6643. 14(9). doi: 10.3390/nu14091873. Fulltekst i vitenarkiv
• Stenqvist, Thomas Birkedal; Melin, Anna Katarina; Garthe, Ina; Slater, Gary; Paulsen, Gøran & Iraki, Juma [Vis alle 8 forfattere av denne artikkelen] (2021). Prevalence of Surrogate Markers of Relative Energy Deficiency in Male Norwegian Olympic-Level Athletes. International Journal of Sport Nutrition & Exercise Metabolism. ISSN 1526-484X. 31(6), s. 497–506. doi: 10.1123/ijsnem.2020-0368. Fulltekst i vitenarkiv Vis sammendrag

  The syndrome of Relative Energy Deficiency in Sport (RED-S) includes wide-ranging effects on physiological and psychological functioning, performance, and general health. However, RED-S is understudied among male athletes at the highest performance levels. This cross-sectional study aimed to investigate surrogate RED-S markers prevalence in Norwegian male Olympic-level athletes. Athletes (n = 44) aged 24.7 ± 3.8 years, body mass 81.3 ± 15.9 kg, body fat 13.7% ± 5.8%, and training volume 76.1 ± 22.9 hr/month were included. Assessed parameters included resting metabolic rate (RMR), body composition, and bone mineral density by dual-energy X-ray absorptiometry and venous blood variables (testosterone, free triiodothyronine, cortisol, and lipids). Seven athletes (16%) grouped by the presence of low RMR (RMRratio < 0.90) (0.81 ± 0.07 vs. 1.04 ± 0.09, p < .001, effect size 2.6), also showed lower testosterone (12.9 ± 5.3 vs. 19.0 ± 5.3 nmol/L, p = .020) than in normal RMR group. In low RMRratio individuals, prevalence of other RED-S markers (—subclinical—low testosterone, low free triiodothyronine, high cortisol, and elevated low-density lipoprotein) was (N/number of markers): 2/0, 2/1, 2/2, 1/3. Low bone mineral density (z-score < −1) was found in 16% of the athletes, all with normal RMR. Subclinical low testosterone and free triiodothyronine levels were found in nine (25%) and two (5%) athletes, respectively. Subclinical high cortisol was found in 23% of athletes while 34% had elevated low-density lipoprotein cholesterol levels. Seven of 12 athletes with two or more RED-S markers had normal RMR. In conclusion, this study found that multiple RED-S markers also exist in male Olympic-level athletes. This highlights the importance of regular screening of male elite athletes, to ensure early detection and treatment of RED-S.

• Stenqvist, Thomas Birkedal; Torstveit, Monica Klungland; Faber, Jens & Melin, Anna Katarina (2020). Impact of a 4-Week Intensified Endurance Training Intervention on Markers of Relative Energy Deficiency in Sport (RED-S) and Performance Among Well-Trained Male Cyclists. Frontiers in Endocrinology. ISSN 1664-2392. 11. doi: 10.3389/fendo.2020.512365. Fulltekst i vitenarkiv
• Hanstock, Helen; Govus, Andrew; Stenqvist, Thomas Birkedal; Melin, Anna Katarina; Sylta, Øystein & Torstveit, Monica Klungland (2019). Influence of Immune and Nutritional Biomarkers on Illness Risk During Interval Training. International Journal of Sports Physiology and Performance (IJSPP). ISSN 1555-0265. doi: 10.1123/ijspp.2018-0527.
• Torstveit, Monica Klungland; Fahrenholtz, Ida Lysdahl; Lichtenstein, Mia Beck; Stenqvist, Thomas Birkedal & Melin, Anna Katarina (2019). Exercise dependence, eating disorder symptoms and biomarkers of Relative Energy Deficiency in Sports (RED-S) among male endurance athletes. BMJ Open sport & exercise medicine. ISSN 2055-7647. 5(1). doi: 10.1136/bmjsem-2018-000439. Fulltekst i vitenarkiv
• Torstveit, Monica Klungland; Fahrenholtz, Ida Lysdahl; Stenqvist, Thomas Birkedal; Sylta, Øystein & Melin, Anna (2018). Within-day Energy Deficiency and Metabolic Perturbation in Male Endurance Athletes. International Journal of Sport Nutrition & Exercise Metabolism. ISSN 1526-484X. 28(4), s. 419–427. doi: 10.1123/ijsnem.2017-0337. Vis sammendrag

  Endurance athletes are at increased risk of relative energy deficiency associated with metabolic perturbation and impaired health. We aimed to estimate and compare within-day energy balance in male athletes with suppressed and normal resting metabolic rate (RMR) and explore whether within-day energy deficiency is associated with endocrine markers of energy deficiency. A total of 31 male cyclists, triathletes, and long-distance runners recruited from regional competitive sports clubs were included. The protocol comprised measurements of RMR by ventilated hood and energy intake and energy expenditure to predict RMRratio (measured RMR/predicted RMR), energy availability, 24-hr energy balance and within-day energy balance in 1-hr intervals, assessment of body composition by dual-energy X-ray absorptiometry, and blood plasma analysis. Subjects were categorized as having suppressed (RMRratio  0.90, n = 11) RMR. Despite there being no observed differences in 24-hr energy balance or energy availability between the groups, subjects with suppressed RMR spent more time in an energy deficit exceeding 400 kcal (20.9 [18.8-21.8] hr vs. 10.8 [2.5-16.4], p = .023) and had larger single-hour energy deficits compared with subjects with normal RMR (3,265 ± 1,963 kcal vs. -1,340 ± 2,439, p = .023). Larger single-hour energy deficits were associated with higher cortisol levels (r = -.499, p = .004) and a lower testosterone:cortisol ratio (r = .431, p = .015), but no associations with triiodothyronine or fasting blood glucose were observed. In conclusion, within-day energy deficiency was associated with suppressed RMR and catabolic markers in male endurance athletes.

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• Østrem, Ketil & Stenqvist, Thomas Birkedal (2023). Trygg læring i friluftslivet . Fædrelandsvennen. ISSN 0805-3790.
• Stenqvist, Thomas Birkedal (2022). Vil du prestere bedre? .
• Stenqvist, Thomas Birkedal (2022). Vil du prestere bedre? lokalavisen fedrelandsvennen.
• Laxdal, Aron Gauti; Stenqvist, Thomas Birkedal & Aasland, Erik (2022). Utfordringer og muligheter knyttet til tilpasset undervisning i friluftsliv: En kvalitativ case-studie.
• Stenqvist, Thomas Birkedal & Atkinson, Leonard Henry (2021). Kajakkpadling er enklere enn du tror . Adresseavisen. ISSN 0805-3804.
• Stenqvist, Thomas Birkedal & Atkinson, Leonard Henry (2021). Kajakkpadling er enklere enn du tror . Folkebladet.no.
• Stenqvist, Thomas Birkedal & Atkinson, Leonard Henry (2021). Kajakkpadling er enklere enn du tror. Fædrelandsvennen. ISSN 0805-3790.
• Stenqvist, Thomas Birkedal & Øvrevik, Geir (2021). Skole ved kysten. I Østrem, Ketil (Red.), Nærmiljøfriluftsliv i skolen. Cappelen Damm Akademisk. ISSN 9788202675813.
• Øvrevik, Geir & Stenqvist, Thomas Birkedal (2021). Skole ved kysten. I Østrem, Ketil (Red.), Nærmiljøfriluftsliv i skolen. Cappelen Damm Akademisk. ISSN 9788202675813.
• Coward, Espen; Spencer, Matthew & Stenqvist, Thomas Birkedal (2020). TRAINING METHODS AND INTENSITY DISTRIBUTION OF YOUNG ELITE ENDURANCE ATHLETES: A TWO-YEAR LONGITUDI- NAL STUDY.
• Stenqvist, Thomas Birkedal; Melin, Anna Katarina; Garthe, Ina; Slater, Gary; Paulsen, Gøran & Torstveit, Monica Klungland (2020). RELATIVE ENERGY DEFICIENCY IN SPORT AMONG MALE NORWEGIAN WORLD-CLASS ATHLETES.
• Byrkjedal, Per Thomas; Stenqvist, Thomas Birkedal; Torstveit, Monica Klungland; Bergsvik, Kristina & Spencer, Matthew (2020). No effect of a three-week post-season transition period on markers of RED-S in highly-trained male cyclists.
• Stenqvist, Thomas Birkedal & Bere, Elling Tufte (2020). How traditional Norwegian outdoor activities are changing; a 10 year follow up. ECSS Conference Proceedings. ISSN 2188-1154.
• Stenqvist, Thomas Birkedal & Øvrevik, Geir (2020). Motivational factors for participating in a Norwegian Outdoor education program. ECSS Conference Proceedings. ISSN 2188-1154.
• Melin, Anna Katarina; Fahrenholtz, Ida Lysdahl; Lichtenstein, Mia Beck; Stenqvist, Thomas Birkedal & Torstveit, Monica Klungland (2019). Exercise dependence, eating disorder symptoms and biomarkers of relative energy deficiency among male endurance athletes .
• Torstveit, Monica Klungland; Stenqvist, Thomas Birkedal & Melin, Anna Katarina (2019). Effects Of An Intensified Training Period On Resting Metabolic Rate, Energy Availability, Blood-biomarkers And Performance.
• Stenqvist, Thomas Birkedal (2021). Relative Energy Deficiency in Sport (RED-S) among Norwegian male athletes. Energy availability, health, and performance among male athletes at different age and performance levels. University of Agder. ISSN 978-82-8427-053-1. Fulltekst i vitenarkiv

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