Ida Lysdahl Fahrenholtz

• Fahrenholtz, Ida; Melin, Anna Katarina; Garthe, Ina; Wasserfurth, Paulina; Ivarsson, Andreas & Hollekim-Strand, Siri Marte [Show all 11 contributors for this article] (2023). Short-term effects and long-term changes of FUEL—a digital sports nutrition intervention on REDs related symptoms in female athletes. Frontiers in Sports and Active Living. ISSN 2624-9367. 5. doi: 10.3389/fspor.2023.1254210. Full text in Research Archive
• Fahrenholtz, Ida; Melin, Anna K.; Garthe, Ina; Hollekim-Strand, Siri Marte; Ivarsson, Andreas & Koehler, Karsten [Show all 11 contributors for this article] (2023). Effects of a 16-Week Digital Intervention on Sports Nutrition Knowledge and Behavior in Female Endurance Athletes with Risk of Relative Energy Deficiency in Sport (REDs). Nutrients. ISSN 2072-6643. 15(5). doi: 10.3390/nu15051082. Full text in Research Archive Show summary

  Female endurance athletes are considered a high-risk group for developing Relative Energy Deficiency in Sport (REDs). Due to the lack of educational and behavioral intervention studies, targeting and evaluating the effects of the practical daily management of REDs, we developed the Food and nUtrition for Endurance athletes—a Learning (FUEL) program, consisting of 16 weekly online lectures and individual athlete-centered nutrition counseling every other week. We recruited female endurance athletes from Norway (n = 60), Sweden (n = 84), Ireland (n = 17), and Germany (n = 47). Fifty athletes with symptoms of REDs and with low risk of eating disorders, with no use of hormonal contraceptives and no chronic diseases, were allocated to either the FUEL intervention (n = 32) (FUEL) or a 16-week control period (n = 18) (CON). All but one completed FUEL, while 15 completed CON. We found strong evidence for improvements in sports nutrition knowledge, assessed via interviews, and moderate to strong evidence in the ratings concerning self-perceived sports nutrition knowledge in FUEL versus CON. Analyses of the seven-day prospective weighed food record and questions related to sports nutrition habits, suggested weak evidence for improvements in FUEL versus CON. The FUEL intervention improved sports nutrition knowledge and suggested weak evidence for improved sports nutrition behavior in female endurance athletes with symptoms of REDs.

• Fahrenholtz, Ida Lysdahl; Melin, Anna Katarina; Wasserfurth, Paulina; Stenling, Andreas; Logue, Danielle & Garthe, Ina [Show all 11 contributors for this article] (2022). Risk of Low Energy Availability, Disordered Eating, Exercise Addiction, and Food Intolerances in Female Endurance Athletes. Frontiers in Sports and Active Living. ISSN 2624-9367. 4. doi: 10.3389/fspor.2022.869594. Full text in Research Archive
• 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. Full text in Research Archive
• Fahrenholtz, Ida Lysdahl; Sjödin, Anders; Benardot, Dan; Tornberg, Åsa; Skouby, Svend & Faber, Jens [Show all 8 contributors for this article] (2018). Within-day energy deficiency and reproductive function in female endurance athletes. Scandinavian Journal of Medicine & Science in Sports. ISSN 0905-7188. doi: 10.1111/sms.13030. Show summary

  We aimed to estimate and compare within-day energy balance (WDEB) in athletes with eumenorrhea and menstrual dysfunction (MD) with similar 24-hour energy availability/energy balance (EA/EB). Furthermore, to investigate whether within-day energy deficiency is associated with resting metabolic rate (RMR), body composition, S-cortisol, estradiol, T3 , and fasting blood glucose. We reanalyzed 7-day dietary intake and energy expenditure data in 25 elite endurance athletes with eumenorrhea (n = 10) and MD (n = 15) from a group of 45 subjects where those with disordered eating behaviors (n = 11), MD not related to low EA (n = 5), and low dietary record validity (n = 4) had been excluded. Besides gynecological examination and disordered eating evaluation, the protocol included RMR measurement; assessment of body composition by dual-energy X-ray absorptiometry, blood plasma analysis, and calculation of WDEB in 1-hour intervals. Subjects with MD spent more hours in a catabolic state compared to eumenorrheic athletes; WDEB

• 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), p. 419–427. doi: 10.1123/ijsnem.2017-0337. Show summary

  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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• Solstad, Bård Erlend; Fahrenholtz, Ida; Melin, Anna K.; Garthe, Ina; Waaland, Marlene & Torstveit, Monica Klungland (2023). THE EFFECT OF A DIGITAL INTERVENTION ON EATING AND WEIGHT CONCERNS AMONG FEMALE ENDURANCE ATHLETES WITH HIGH VERSUS LOW RISK OF EATING DISORDERS.
• Fahrenholtz, Ida; Melin, Anna Katarina; Garthe, Ina; Ivarsson, Andreas; Koehler, Karsten & Logue, Danielle [Show all 9 contributors for this article] (2023). EFFECTS OF THE FUEL INTERVENTION ON MENSTRUAL FUNCTION IN COMPETITIVE FEMALE ENDURANCE ATHLETES WITH RISK OF RELATIVE ENERGY DEFICIENCY IN SPORT.
• Fahrenholtz, Ida & Lohne-Seiler, Hilde (2022). Derfor er det bra å trene under svangerskapet .
• Fahrenholtz, Ida (2022). Trener du mer, må du spise mer .
• Fahrenholtz, Ida (2022). Within-day energy deficiency and reproductive function in female endruance athletes.
• Fahrenholtz, Ida (2022). The FUEL study – a practice orientated nutrition intervention for female endurance athletes for the management of relative energy deficiency in sport (REDS).
• Fahrenholtz, Ida; Melin, Anna Katarina; Garthe, Ina; Hollekim-Strand, Siri Marte; Logue, Danielle & Koehler, Karsten [Show all 9 contributors for this article] (2022). A 16-week online sports nutrition intervention reduces symptoms of eating disorders in female endurance athletes with risk of relative energy deficiency in sport (RED-S).
• Fahrenholtz, Ida Lysdahl & Lohne-Seiler, Hilde (2022). Derfor er det bra å trene under svangerskapet. Fædrelandsvennen. ISSN 0805-3790.
• Fahrenholtz, Ida Lysdahl (2022). Treningsekspert avliver etablert myte – Slik kan du spise etter økta. [Newspaper]. Nettavisen.
• Fahrenholtz, Ida Lysdahl (2022). Trener du mer, må du spise mer. Fædrelandsvennen. ISSN 0805-3790.
• Fahrenholtz, Ida Lysdahl; Melin, Anna Katarina; Garthe, Ina; Hollekim-Strand, Siri Marte; Logue, Danielle & Koehler, Karsten [Show all 9 contributors for this article] (2022). Participants’ evaluation of the FUEL-intervention – a recovery program for female endurance athletes with Relative Energy Deficiency in Sport (RED-S) .
• 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 .
• Staal, Sarah; Sjödin, Anders; Fahrenholtz, Ida Lysdahl & Melin, Anna Katarina (2018). Low prevalence of impaired bone health in professional ballet dancers.

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