Low Energy Availability Research Articles

Prevalence of Exercise Related Amenorrhea in Females

Background: Amenorrhea in physically active women is a significant health concern, often associated with intensive exercise and dietary patterns. Understanding its prevalence and influencing factors is essential for devising effective health interventions and promoting women's health in sports. Objective: The study aimed to explore the prevalence of amenorrhea among women regularly engaged in sports or gym activities and to identify key factors affecting menstrual health in this demographic. Methods: This cross-sectional survey, spanning six months, included 71 female athletes aged 13-37 from two fitness centers in Lahore. The research employed non-probability convenient sampling. Data collection was achieved using the Low Energy Availability in Females Questionnaire (LEAF-Q) and the Female Athlete Screening Tool (FAST). Statistical analyses were conducted using IBM SPSS Statistics 20. Results: The participants' mean age was 28.35 ± 5.02 years, with an average BMI of 27.90 ± 3.6. Among them, 18.3% had a normal BMI, 52.1% were underweight, and 29.6% were obese. LEAF-Q results indicated that 70% of participants experienced moderate menstrual disturbances, while 20% had slight disturbances without a clinical diagnosis of amenorrhea. The overall prevalence of amenorrhea was 1.41%. Influential factors included BMI, education, awareness, and guidance from fitness professionals. Conclusion: Contrary to initial expectations of a higher prevalence, the study discovered a relatively low occurrence of amenorrhea (1.41%) among active women. This underlines the importance of targeted educational and support interventions in fitness settings to manage menstrual health. Future research should further examine the interplay between exercise, diet, and menstrual health to improve care for female athletes.

Risk of Low Energy Availability, Disordered Eating, and Menstrual Dysfunction in Female Collegiate Runners.

Collegiate female distance runners may be at risk for low energy availability (LEA) due to increased exercise energy expenditure with or without decreased energy intake. Furthermore, this population has increased risk of disordered eating (DE), which can lead to LEA and negative health consequences, such as menstrual dysfunction (MD). 1) investigate risk of LEA and DE, 2) compare DE, training volume, and weight dissatisfaction among female collegiate runners at risk vs not at risk for LEA, and 3) compare risk for LEA between NCAA (National Collegiate Athletics Association) Division I, II, and III female collegiate runners. Cross-sectional study. Free-living. Female runners (n = 287) who competed on an NCAA (National Collegiate Athletics Association) Division I, II, or III cross-country and/or track team. A 45 question questionnaire was completed which included the Low Energy Availability in Females Questionnaire (LEAF-Q) and the Disordered Eating Screening Assessment (DESA-6). 54.5% (n = 156) of runners were at risk for LEA (score ≥ 8 on LEAF-Q), and 40.8% (n = 117) were at risk for DE (DESA-6 score ≥ 3), and 56.5% (n = 162) reported MD (LEAF-Q subsection MD score ≥ 4). Athletes "at risk" for LEA had significantly higher DESA-6 scores than athletes "not at risk" for LEA (p < 0.001). Athletes "at risk" for LEA had significantly greater weight dissatisfaction than those not at risk for LEA (X23, 156 = 15.92, p = 0.001). Higher weekly training volumes was not associated with risk for LEA (X22, 156 = 4.20, p = 0.112). A substantial percentage of collegiate female runners were found to be at risk for LEA, DE, and report MD. These findings demonstrate that risk for DE, MD, and weight dissatisfaction are associated with risk for LEA.

Short-term effects and long-term changes of FUEL-a digital sports nutrition intervention on REDs related symptoms in female athletes.

www.clinicaltrials.gov (NCT04959565).

The Role of Social Factors in Relative Energy Deficiency Risk for Female Collegiate Athletes

BACKGROUND: Relative Energy Deficiency in Sport (RED-S) refers to compromised functioning of one’s metabolism, reproductive system, immune system, cardiovascular system and more due to a relative energy deficiency. Most prevailing RED-S research has focused on its physiological symptoms, yet little data exists regarding the psychological and social aspects that might contribute to its development. The purpose of this study is to determine the role of psychosocial factors in RED-S risk for female collegiate athletes. METHODS: 105 female collegiate athletes under National Collegiate Athletic Association (NCAA) jurisdiction were surveyed representing a variety of varsity sports. All participants were assessed for low energy availability using the Low Energy Availability in Females Questionnaire (LEAF-Q) through an online survey battery, which also included sources of nutrition information scale (SONI scale), the revised group environment questionnaire (GEQ), and the revised exercise group social provisions scale (EXSPS questionnaire). The participants were sorted into an At Risk (AR) and Not At Risk (NAR) group based on their LEAF-Q scores. One-tailed independent t-tests and chi square tests were used to determine the difference between AR and NAR for dependent measures, and multiple linear regression determined the relationship between risk of LEA and GEQ, EXSPS, and SONI. RESULTS: Overall, 66 participants (62.8%) were at risk for LEA based on LEAF-Q scores. Significant differences were identified between the AR (11.5%; 66.7%) and NAR (40.0%; 37.0%) groups regarding comfort with discussing nutrition with coaches or teammates, respectively (p = 0.034, p = 0.035). However, none of the social measures predicted LEA risk (group cohesion: R = 0.04, p = 0.92; social support: R = 1.85, p = 0.09; SONI: p = 0.136) Awareness of RED-S (using a Yes (1) or No (0) question) was also found to be not significantly different between the AR (0.28 ± 0.45, 29%) and NAR (0.39 ± 0.50, 41%) groups (p = 0.12). CONCLUSION: Overall, risk for RED-S is high in female collegiate athletes, however group cohesion, social support, and the athletes’ sources of nutrition information did not predict RED-S incidence.

Low energy availability in volleyball players, but no association with bone mineral density

Low energy availability in volleyball players, but no association with bone mineral density

Differences in Knowledge of Female Athlete Triad and Relative Energy Deficiency in Sport in Female Cross-Country Athletes.

The female athlete triad (Triad) and relative energy deficiency in sport (REDs) describe potential health and performance consequences of low energy availability. We surveyed female cross-country athletes to assess differences in educational impact scores (EIS; knowledge score × confidence score factor) of Triad and REDs. Associations between EIS and participant characteristics (eg, mileage [current and peak], years of running experience, age, bone stress injury history, division level participation, academic area of study, Triad or REDs diagnoses, and Triad or REDs education) were explored. An evidence-based online survey was developed and administered via Qualtrics to female collegiate cross-country athletes (n = 275; age = 20 ± 1 years). A weak correlation existed between peak career mileage and EIS (r = 0.195; P = .010). Educational impact scores significantly differed in athletes with a related academic area of study versus those without (21.91 ± 5.16 and 16.11 ± 5.54, respectively). Educational impact scores significantly differed in athletes with Triad and REDs diagnoses (21.69 ± 5.85 and 22.58 ± 6.82, respectively) versus those without (16.80 ± 6.54 and 17.20 ± 6.34, respectively). Educational impact scores were higher in those who had received Triad education versus those who had not (21.03 ± 6.86 and 18.12 ± 6.82, respectively). A significant interaction between peak career mileage and Triad diagnosis was found (P = .005). Significant education-based and diagnosis differences suggest that Triad diagnoses correlate with peak career mileage. These findings support the facilitation of education to improve not only the treatment but also the prevention of Triad and REDs.

Free-living competitive racewalkers and runners with energy availability estimates of

The release of luteinising hormone (LH) before ovulation is disrupted during a state of low energy availability (EA). However, it remains unknown whether a threshold EA exists in athletic populations to trigger ovulatory disturbances (anovulation and luteal phase deficiency) as indicated by peak/mid-luteal serum progesterone concentration (Pk-PRG) during the menstrual cycle. We assessed EA and Pk-PRG in 15 menstrual cycles to investigate the relationship between EA and Pk-PRG in free-living, competitive (trained-elite) Guatemalan racewalkers (n = 8) and runners (n = 7) [aged: 20 (14-41) years; post-menarche: 5 (2-26) years; height: 1.53 ± 0.09 m; mass: 49 ± 6 kg (41 ± 5 kg fat-free mass "FFM")]. EA was estimated over 7 consecutive days within the follicular phase using food, training, and physical activity diaries. A fasted blood sample was collected during the Pk-PRG period, 6-8 days after the LH peak, but before the final 2 days of each cycle. Serum progesterone concentration was quantified using electrochemiluminescence immunoassay. Participants that reported an EA of <35 kcal·kg FFM-1·day-1 (n = 7) exhibited ovulatory disturbances (Pk-PRG ≤9.40 ng·mL-1). Athletes with EA ≥36 kcal·kg FFM-1·day-1 (n = 8) recorded "normal"/"potentially fertile" cycles (Pk-PRG >9.40 ng·mL-1), except for a single racewalker with the lowest reported protein intake (1.1 g·kg body mass-1·day-1). EA was positively associated with Pk-PRG [r(9) = 0.79, 95% confidence interval (CI): 0.37-0.94; p = 0.003; 1 - β = 0.99] after excluding participants (n = 4) that likely under-reported/reduced their dietary intake. The result from the linear regression analysis suggests that an EA ≥ 36 kcal·kg FFM-1·day-1 is required to achieve "normal ovulation." The threshold EA associated with ovulatory disturbances in athletes and non-invasive means of monitoring the ovulatory status warrant further research.

The Impact of a Short-Term Ketogenic Low-Carbohydrate High-Fat Diet on Biomarkers of Intestinal Epithelial Integrity and Gastrointestinal Symptoms.

Endurance exercise can disturb intestinal epithelial integrity, leading to increased systemic indicators of cell injury, hyperpermeability, and pathogenic translocation. However, the interaction between exercise, diet, and gastrointestinal disturbance still warrants exploration. This study examined whether a 6-day dietary intervention influenced perturbations to intestinal epithelial disruption in response to a 25-km race walk. Twenty-eight male race walkers adhered to a high carbohydrate (CHO)/energy diet (65% CHO, energy availability = 40kcal·kg FFM-1·day-1) for 6 days prior to a Baseline 25-km race walk. Athletes were then split into three subgroups: high CHO/energy diet (n = 10); low-CHO, high-fat diet (LCHF: n = 8; <50g/day CHO, energy availability = 40kcal·kg FFM-1·day-1); and low energy availability (n = 10; 65% CHO, energy availability = 15kcal·kg FFM-1·day-1) for a further 6-day dietary intervention period prior to a second 25-km race walk (Adaptation). During both trials, venous blood was collected pre-, post-, and 1hr postexercise and analyzed for markers of intestinal epithelial disruption. Intestinal fatty acid-binding protein concentration was significantly higher (twofold increase) in response to exercise during Adaptation compared to Baseline in the LCHF group (p = .001). Similar findings were observed for soluble CD14 (p < .001) and lipopolysaccharide-binding protein (p = .003), where postexercise concentrations were higher (53% and 36%, respectively) during Adaptation than Baseline in LCHF. No differences in high CHO/energy diet or low energy availability were apparent for any blood markers assessed (p > .05). A short-term LCHF diet increased intestinal epithelial cell injury in response to a 25-km race walk. No effect of low energy availability on gastrointestinal injury or symptoms was observed.

Differences in screening and treating relative energy deficiency in sport between the United States of America and Japan.

The diagnosis and treatment of relative energy deficiency in sport (RED-S) are challenging owing to variations in symptoms and the absence of specific guidelines. This study aimed to investigate differences in the diagnosis and follow-up of RED-S, its consequences, and related factors among sports medicine physicians with different backgrounds in Japan and the USA and examine the differences between the two countries. An anonymous survey regarding the diagnosis and treatment processes of RED-S was distributed to sports medicine physicians via email. Respondents included 58 sports medicine physicians from the USA and 241 from Japan. The findings showed that 77.6% of the US physicians screened athletes for RED-S, whereas 17.5% of their Japanese counterparts did so. Moreover, 98.3% and 36.7% of the US and Japanese physicians, respectively, answered that they screened athletes for eating disorders upon suspicion of low energy availability. Logistic regression analysis revealed that the number of US sports medicine physicians who screened athletes for the female athlete triad (Triad) and RED-S (odds ratio [OR] = 12.78, P<0.001) and adhered to specific criteria for athlete suspension and return-to-play (OR=33.67, P<0.01) was higher than that of their Japanese counterparts. The prevalence of RED-S-related screening and treatment differed between US and Japanese sports medicine physicians. Educating sports medicine physicians about the diagnosis and treatment of athletes with possible signs of RED-S is important in treating female athletes and further investigations are required to identify why the physicians screened/not screened the athletes.

Under-Fuelling for the Work Required? Assessment of Dietary Practices and Physical Loading of Adolescent Female Soccer Players during an Intensive International Training and Game Schedule.

Previous studies demonstrate that "under-fuelling" (i.e., reduced carbohydrate (CHO) and energy intake (EI) in relation to recommended guidelines) is prevalent within adult female soccer players, the consequence of which may have acute performance and chronic health implications. However, the dietary practices of adolescent female soccer players, a population who may be particularly at risk for the negative aspects of low energy availability (LEA), are not well documented. Accordingly, we aimed to quantify EI and CHO intake, physical loading and estimated energy availability (EA) in elite national team adolescent female soccer players (n = twenty-three; age, 17.9 ± 0.5 years) during a 10-day training and game schedule comprising two match days on day six (MDa) and nine (MDb). The players self-reported their EI via the remote food photography method, whilst the physical loading and associated exercise energy expenditure were assessed via GPS technology. The relative CHO intake was significantly greater (all p < 0.05) on the day before the first match (MD-1a) (4.1 ± 0.8 g·kg-1), on the day before the second match (MD-1b) (4.3 ± 1.1 g·kg-1), MDa (4.8 ± 1.2 g·kg-1) and MDb (4.8 ± 1.4 g·kg-1) in comparison to most other days (<4 g·kg-1). The mean daily measured EA over the 10-day period was 34 ± 12 kcal·kg FFM-1·day-1 (with six players, i.e., 34%, presenting LEA), though, when adjusting the energy intake for potential under-reporting, these values changed substantially (44 ± 14 kcal·kg FFM-1·day-1, only one player was classed as presenting LEA). Such data suggest that the prevalence of LEA amongst female team sport athletes may be over-estimated. Nonetheless, players are still likely under-fuelling for the work required in relation to the daily CHO recommendations (i.e., >6 g·kg-1) for intensive training and game schedules. These data provide further evidence for the requirement to create and deliver targeted player and stakeholder education and behaviour change interventions (especially for younger athletes) that aim to promote increased daily CHO intake in female soccer players.

Considerations of Low Carbohydrate Availability (LCA) to Relative Energy Deficiency in Sport (RED-S) in Female Endurance Athletes: A Narrative Review.

The purpose of this narrative review is to identify health and performance consequences associated with LCA in female endurance athletes. The intake of carbohydrates (CHO) before, during, and after exercise has been demonstrated to support sport performance, especially endurance activities which rely extensively on CHO as a fuel source. However, low energy availability (LEA) and low carbohydrate availability (LCA) are common in female athletes. LEA occurs when energy intake is insufficient compared to exercise energy expenditure, and LEA-related conditions (e.g., Female Athlete Triad (Triad) and Relative Energy Deficiency in Sport (RED-S)) are associated with a myriad of health and performance consequences. The RED-S model highlights 10 health consequences and 10 performance consequences related to LEA. The independent effect of LCA on health and performance has been under-researched, despite current CHO intake being commonly insufficient in athletes. It is proposed that LCA may not only contribute to LEA but also have independent health and performance consequences in athletes. Furthermore, this review highlights current recommendations for CHO intake, as well as recent data on LCA prevalence and menstrual cycle considerations. A literature review was conducted on PubMed, Science Direct, and ResearchGate using relevant search terms (i.e., "low carbohydrate/energy availability", "female distance runners"). Twenty-one articles were identified and twelve met the inclusion criteria. The total number of articles included in this review is 12, with 7 studies illustrating that LCA was associated with direct negative health and/or performance implications for endurance-based athletes. Several studies included assessed male athletes only, and no studies included a female-only study design. Overall, the cumulative data show that female athletes remain underrepresented in sports science research and that current CHO intake recommendations and strategies may fail to consider female-specific adaptations and hormone responses, such as monthly fluctuations in estrogen and progesterone throughout the menstrual cycle. Current CHO guidelines for female athletes and exercising women need to be audited and explored further in the literature to support female athlete health and performance.

RED-S: A Review of the Screening, Diagnosis, Treatment, and Recovery

ABSTRACT Relative energy deficiency in sport (RED-S) is a complex syndrome of endocrine, metabolic, and physiological maladaptation. Adverse effects on physiological and psychological health and the performance of the athlete may occur due to a prolonged exposure to low-energy availability (LEA). LEA occurs when there is an energy intake (EI) deficiency relative to exercise energy expenditure (EEE) and normal physiological functioning. Early detection of the state of LEA and RED-S is crucial to prevent long-term negative health consequences. Given that LEA is the underlying cause of RED-S, increasing the athlete's energy availability (EA) to an optimal level is the recommended treatment. This paper reviews the current evidence and recommendations for the screening and diagnostic tools of LEA and RED-S, the recommended treatment strategies including reducing EEE, increasing EI, carbohydrate availability, within-day EA, psychological support, and the multidisciplinary team's role, and finally, it reviews the literature on its recovery process. It aims to provide a comprehensive summary of the research to date, with practical recommendations for the identification, management, and treatment of RED-S.

Survival Strategies of High GC-Content Microorganisms in Oligotrophic Deep Groundwater

Deep groundwaters are among the most energy and nutrient-limited ecosystems on the planet. The limited resources are mainly due to the absence of photosynthesis-driven primary production (Kadnikov et al. 2020). These ecosystems do however host phylogenetically diverse and metabolically active microorganisms from all domains of life plus viruses (Holmfeldt et al. 2021, Mehrshad et al. 2021). In this study, we used a large metagenomic dataset generated over the last eight years from the Äspö Hard Rock Laboratory (Äspö HRL) in Sweden and drill holes in Olkiluoto Island, Finland. This dataset, termed the “Fennoscandian Shield Genomic Dataset” (FSGD), contains metagenome-assembled genomes (MAGs) and single-cell amplified genomes (SAGs). Previous studies on this dataset have shown that reciprocal symbiotic partnerships and efficiency of energy metabolism define the core microbiome of these deep groundwaters (Mehrshad et al. 2021). Studies on different marine and freshwater ecosystems show that oligotrophic environments host streamlined genomes with lower GC content. However, it is not known how the low carbon and energy availability in deep groundwaters affect the microbial community regarding their genome size and GC content. To address this, we used the FSDG to study the distribution of genome size and GC content among bacterial and archaeal genomes in Fennoscandian Shield deep groundwaters. We further disentangled the prevalent metabolic strategies in these genomes that is being used to support their carbon and nitrogen demands for replication and survival. A total of 1990 MAGs/SAGs with a completeness of ≥50% and &amp;lt;5% contamination were recovered from 43 metagenomic datasets. The taxonomy of the MAGs/SAGs was assigned using the GTDB-tk (Chaumeil et al. 2022) and the GC content and genome size of MAGs/SAGs were calculated. MAGs/SAGs were also functionally annotated to investigate the genome-encoded functional potential. To survey the preference for different metabolic pathways and metabolic cross-feeding, the C-fixation pathways were subdivided into 82 routes that lead to the production of intermediate compounds (e.g., formate, pyruvate, oxaloacetate, etc.). A similar analysis for nitrogen acquisition pathways and CO2-capturing enzymes was performed and the presence/absence of these metabolic modules was investigated in representative MAGs/SAGs from various deep groundwater types to explore the microbial community’s metabolic interaction. The GC content and estimated genome size (EGS) of the recovered MAGs/SAGs were linearly correlated, suggesting that higher genome-level GC content is associated with larger genome size. The most common taxa among high GC (≥50%) content MAGs/SAGs were affiliated with the phyla Proteobacteria, Desulfobacterota, Actinobacteriota, Chloroflexota, and Patescibacteria. Analysis of metabolic modules in the environmental context revealed that high GC content MAGs constituted the main primary producers in all investigated groundwaters. Among the seven investigated C-fixation pathways, routes leading to the production of intermediates of reductive tricarboxylic acid (rTCA) were significantly enriched in high GC-content genomes. Both carboxylation/reduction first CO2-capturing enzymes were significantly enriched in MAGs with high GC contents. Of the various carbon fixation strategies, rGly and rTCA are the most energy-efficient and consume one and three ATP molecules, respectively (Bar-Even et al. 2011), matching the high prevalence of rTCA in oligotrophic deep groundwater. High GC content genomes featured metabolic pathways to generate key precursors for synthesizing purine/pyrimidine and amino acids. As GC base-pairs require one more nitrogen than AT base-pairs, prokaryotes with a higher GC content need proportionally more nitrogen for genome replication. In agreement with this, high GC content MAGs/SAGs from the FSGD feature additional nitrogen uptake systems including ammonium permease and N-fixation genes. High GC content MAGs/SAGs appear to be metabolically versatile and capable of acquiring nutrients via different carbon and nitrogen fixation pathways along with various C-scavenging strategies for substrate uptake to acquire energy and survive in oligotrophic conditions. Although their larger genome size and higher GC content entail higher expenses for replication and maintenance, their presence within the community of deep groundwater is supported by the “Black Queen Theory”. According to this theory, a cell containing an expensive metabolic pathway is maintained within the community as it provides a service that other members cannot.

Reduced glucose concentration enhances ultradian rhythms in Pdcd5 promoter activity in vitro.

Intrinsically driven ultradian rhythms in the hourly range are often co-expressed with circadian rhythms in various physiological processes including metabolic processes such as feeding behaviour, gene expression and cellular metabolism. Several behavioural observations show that reduced energy intake or increased energy expenditure leads to a re-balancing of ultradian and circadian timing, favouring ultradian feeding and activity patterns when energy availability is limited. This suggests a close link between ultradian rhythmicity and metabolic homeostasis, but we currently lack models to test this hypothesis at a cellular level. We therefore transduced 3T3-L1 pre-adipocyte cells with a reporter construct that drives a destabilised luciferase via the Pdcd5 promotor, a gene we previously showed to exhibit robust ultradian rhythms in vitro. Ultradian rhythmicity in Pdcd5 promotor driven bioluminescence was observed in >80% of all cultures that were synchronised with dexamethasone, whereas significantly lower numbers exhibited ultradian rhythmicity in non-synchronised cultures (∼11%). Cosine fits to ultradian bioluminescence rhythms in cells cultured and measured in low glucose concentrations (2mM and 5mM), exhibited significantly higher amplitudes than all other cultures, and a shorter period (6.9h vs. 8.2h, N = 12). Our findings show substantial ultradian rhythmicity in Pdcd5 promotor activity in cells in which the circadian clocks have been synchronised in vitro, which is in line with observations of circadian synchronisation of behavioural ultradian rhythms. Critically, we show that the amplitude of ultradian rhythms is enhanced in low glucose conditions, suggesting that low energy availability enhances ultradian rhythmicity at the cellular level in vitro.

Body dissatisfaction, disordered eating and exercise behaviours: associations with symptoms of REDs in male and female athletes

ObjectivesDisordered eating and compulsive exercise behaviours are common among athletes and can increase the risk of relative energy deficiency in sport (REDs). Contrarily, the prevalence of muscle dysmorphia and its...

Female Athlete Triad: Updated Overview of Low Energy Availability and Triad Components

Kadın Sporcu Triadı, bozulmuş yeme davranışı ile birlikte veya tek başına Düşük Kullanılabilir Enerji (DKE), menstrual fonksiyon bozukluğu ve düşük kemik mineral yoğunluğu gibi bileşenlerden oluşan klinik bir sendromdur. DKE durumu, triadın merkezi veya etiyolojik faktörüdür: Besinlerden alınan enerjinin hem egzersizin/antrenmanın enerji ihtiyacını hem de vücudun büyüme, bağışıklık ve üreme fonksiyonları ile termoregülasyon dahil olmak üzere temel fizyolojik fonksiyonlarını karşılamak için çok düşük (yetersiz) olması durumunda ortaya çıkan bir durumdur. Bu durumun, enerji alımındaki azalmadan veya enerji harcamasındaki artıştan kaynaklanabileceği belirtilmektedir. DKE’ye maruz kalan bir sporcu, normal vücut fonksiyonlarını sürdürecek enerjiden yoksundur ve vücudun bir enerji tasarrufuna gitmesi gerekmektedir. DKE’den kaynaklanan kadın sporcu triadı ile ilişkili menstrual bozukluklar, kas-iskelet sistemini ve kardiyovasküler sağlığı olumsuz etkileyebilmekte, tedavi edilmediği taktirde her yıl kemik kütlesinde yaklaşık %2-3 kayba neden olabilmektedir. Triadın tedavisi, multidisipliner bir yaklaşım gerektirir. Sağlık profesyonelleri, antrenörler ve aileler arasındaki iş birliği oldukça önemlidir. Triadın her bir bileşeninin tedavisi farklı sürelerde gerçekleşmekle birlikte temelinde kullanılabilir enerjinin iyileştirilmesi yatmaktadır.

Surfboard riders are at risk of low energy availability - A pilot study.

Surfing is a rapidly growing sport and recreational activity. The previously reported, intermittent high-intensity energetics of surfing place athletes and recreational participants at risk of low energy availability (LEA). As such, this pioneering study aims to be the first to investigate LEA risk and the second to investigate dietary intake in surfers. Twenty-one intermediate and advanced surfers (female - 5, male - 16) were recruited to complete an online self-administered questionnaire and 4 consecutive 24-hour food logs to establish LEA risk and asses dietary intake. The Low Energy Availability in Female Questionnaire and Eating Disorder Examination Questionnaire were used to identify at-risk individuals in females and males, respectively, with respective cut-off's of ≥8 and ≥2.3. Fifty-seven percent were classed as at-risk of LEA (50% and 80% in males and females, respectively). No significant relationship of competitive status, surfing ability and body mass index on risk classification was found. However, a non-significant medium effect of age was observed (p = 0.338, R = 0.549). And 77% of the 70 total analysed food records showed inadequate carbohydrate (CHO) consumption. In summary, an alarmingly high portion of surfers are at risk of LEA and dietary inadequacy. Future studies should confirm whether surfing organisations need to intervene, by addressing limitations of the present study including a small sample, which was heavily biased away from female and high-level competitors.

Prevalence of low energy availability in 25 New Zealand elite female rowers – A cross sectional study

ObjectivesTo quantify energy availability (EA) in elite female rowers, determine its association with bone mineral density (BMD), and examine the ability of the low energy availability in females-questionnaire (LEAF-Q) and brief eating disorder in athletes-questionnaire (BEDA-Q) to distinguish between low and normal EA. DesignObservational cross-sectional study. MethodsTwenty-five elite female rowers participated in the study. EA was calculated by means of a 4-day food intake diary and analysis of training load. Low energy availability (LEA) was defined as EA <30 kCal * kg−1 * FFM−1 * day−1. Dual-energy X-ray absorptiometry (DXA) was used to assess fat free mass (FFM) and BMD Z-scores. LEA risk was assessed using the LEAF-Q and BEDA-Q. ResultsThe mean EA was 23.2 ± 12.2 kCal * kg−1 * FFM−1 * day−1. Prevalence of LEA was 64 %. The mean BMD Z-score was 1.6 ± 0.6 (range: 0.7 to 2.9). Athletes with LEA had a significantly higher BEDA-Q score than the group with normal EA (mean 0.30 ± 0.17 vs. 0.09 ± 0.11, P < 0.05), but LEAF-Q score was not different between groups (mean 10.4 ± 4.6, 8.2 ± 4.5, P = 0.29). ConclusionLow energy availability is common amongst elite female rowers in New Zealand and is positively correlated with higher scores on the BEDA-Q. Bone mineral density was normal irrespective of EA status.

Advancing Knowledge of the Bio-Cultural Complexities of Low Energy Availability: The Value of Mixed-Methods Approaches

Low energy availability (LEA) is a complex health condition that most commonly affects female athletes. Research on LEA is weighted to quantitative approaches, and few studies have employed qualitative methods to understand the development of LEA. Current research fails to understand the complexity of LEA by largely operating within isolated research paradigms. This paper aims to demonstrate the value of integrating a mixed-methods research approach to understand the influence of sporting cultures on the physiological experiences of female athletes with LEA. The mixed-methods approach implemented the use of physiological (quantitative) and socio-psychological (qualitative) data obtained from elite female athletes in three sports: triathlons and running, (n = 11), rugby sevens (n = 9), and track cycling (n = 10). The physiological data consisted of energy availability, haematological analysis, bone health, and body composition. The socio-psychological data consisted of individual semi-structured interviews with topics covering nutrition, body image, the impact of the sporting environment, and experience with LEA. The interview data were thematically analysed. By bringing qualitative and quantitative data together, this paper illustrates the complex relationship between sporting culture and the physiology of LEA. First, endurance athletes categorised as having an LEA showed a positive correlation between the relative energy intake (EI) and serum ferritin, with the interviews revealing a focus on a low body weight and reducing the EI. Second, the interviews with the rugby players showed a strong but hierarchical team culture, with the experienced players monitoring and controlling the EI of novice players. Third, among the cyclists, the EI was reduced in those categorised as having an LEA, with the interviews revealing a coach–athlete power relationship impacting dietary behaviours. To conclude, this paper demonstrates how mixed methods are important for capturing how different sporting cultures impact athletes’ socio-psychological and physiological experiences of LEA.

Enhancing Sustainable Urban Energy Management through Short-Term Wind Power Forecasting Using LSTM Neural Network

Integrating wind energy forecasting into urban city energy management systems offers significant potential for optimizing energy usage, reducing the carbon footprint, and improving overall energy efficiency. This article focuses on developing a wind power forecasting model using cutting-edge technologies to enhance urban city energy management systems. To effectively manage wind energy availability, a strategy is proposed to curtail energy consumption during periods of low wind energy availability and boost consumption during periods of high wind energy availability. For this purpose, an LSTM-based model is employed to forecast short-term wind power, leveraging a publicly available dataset. The LSTM model is trained with 27,310 instances and 10 wind energy system attributes, which were selected using the Pearson correlation feature selection method to identify crucial features. The evaluation of the LSTM-based forecasting model yields an impressive R2 score of 0.9107. The model’s performance metrics attest to its high accuracy, explaining a substantial proportion of the variance in the test data. This study not only contributes to advancing wind power forecasting, but also holds promise for sustainable urban energy management, enabling cities to make informed decisions in optimizing energy consumption and promoting a greener, more resilient future.