Level Of Athletic Performance Research Articles

Acute effects of sodium citrate supplementation on competitive performance and lactate level of elite fitness challenge athletes: A crossover, placebo-controlled, double-blind study

Background/ObjectiveThe performance of sodium citrate has been investigated in high-intensity exercises, but fewer studies have addressed the role of citrate in weight-bearing exercises. MethodsTwenty fitness challenge athletes, aged 24–32 years, volunteered to participate in this crossover, placebo-controlled, double-blind study. Initially, ten athletes were given a placebo and asked to complete a fitness challenge (i.e., chin-ups, squat jumps, dips, walking lunges, sit-ups, and burpees-devil press). Another ten athletes were supplemented with sodium citrate 0.5 g/kg body mass supplements 3 h prior to performing the fitness challenges. The same procedures were completed two days later with the supplement and placebo dextrose groups switched in a cross-over design. Athletes and assessors were blinded for the experimental condition (placebo vs. verum). Lactate levels were measured 5 min after exercise. The athletes' performance on each item of the fitness challenge as well as their lactate levels, were compared. Differences between the means of the measured variables were contrasted using a dependent t-test. ResultsSupplementing sodium citrate substantially improved athletes' performance in all six fitness challenge items (p < 0.05, 0.69<Cohen's d < 2.52, moderate to large). In addition, lactate levels registered after the fitness challenge were lower in the citrate sodium supplementation vs. placebo condition (p = 0.001, Cohen's d = 0.63, moderate). ConclusionAcute sodium citrate supplementation may help fitness challengers postpone muscular fatigue and increase performance, potentially via the prevention of lactate accumulation.

Effect of Prathimarsa Nasya and Abhyanga on the Physical Fitness among Athletes in the Sports Hostel of Mar Basil Higher Secondary School Kothamangalam

Physical fitness has direct influence on athlete’s performance level. Sports medicine deals with the physical fitness and the treatment of injury related to sports and exercise by curative, rehabilitative and preventive modalities. Ayurveda the complete science of life can contribute in this field also. Abhyanga and Prathimarsa nasya are important Dinacharya procedures which play a key role in the maintenance of health and fitness of athletes. Regular Abhyanga controls Vata dosas and improves physical strength. Prathimarsa nasya improves the musculature of neck shoulder and chest. Ayurveda classics advice Abhyanga with Thila thailam and Prathimarsa Nasya with Anuthailam as a daily regimen for healthy individual. This study is being made to highlight the application of these Ayurveda Dinacharya procedures in promoting the physical fitness of sports persons. This study is a single group pre-post study. 47 subjects of age group 12–18 participating in athletic events were selected from the Sports Hostel of Mar Basil Higher Secondary School Kothamangalam as per the inclusion and exclusion criteria. After necessary investigations participants had been advised to follow the daily regimen Abhyanga with Thila Thaila after work out, half an hour before bath and Prathimarsa Nasyam with Anuthailam in morning, between 6am- 6.30am for 60 days continuously. Assessments were done on 31st day, 61st day and 91st day (follow up). Scores recorded for test items were converted into marks as per formula based on AAHPER fitness test chart and subjected to statistical analysis using repeated measure ANOVA test. Results showed that Pratimarsha nasya and Abhyanga have statistical significance in improving the physical fitness variables and overall performance level of athletes.

Genetic variants in myostatin and its receptors promote elite athlete status

BackgroundWhile product of the myostatin gene (MSTN) is an important factor influencing muscle growth, which is well confirmed in nonhuman species, it has not been clearly confirmed whether MSTN expression influences interindividual differences in skeletal muscle mass, affects posttraining changes, or plays a role in the age-related loss of muscle mass and function in humans. Although the inconclusive results are usually explained by ethnic differences and the low frequency of some alleles, it is possible that the role of receptors (ACVR2A and ACVR2B) that affect the biological activity of myostatin is crucial. Therefore, we investigated the sequences of the MSTN, ACVR2A, and ACVR2B genes and determined the interaction between allelic variants and athletic performance and competition level in the Caucasian population. One hundred-two athletes were recruited for the sequencing study, and whole-genome sequencing (WGS) was performed. Second, 330 athletes and 365 controls were included, and real-time PCR was performed.ResultsThe sequence analysis revealed two polymorphisms relatively common in the athlete cohort, and the alternate allele showed overrepresentation in athletes: MSTN rs11333758 and ACVR2A rs3764955. Regarding the polymorphic site MSTN rs11333758, there was a significant overrepresentation of the –/– genotype in all high-elite and mixed-sport high-elite athletes. Carriers of the ACVR2A rs3764955 CC and GG genotypes were more likely to be elite and high-elite athletes. In addition, carriers of the CC genotype were more likely to be in the mixed-sport subelite group. The gene‒gene interaction analysis revealed that mixed-sport high elite athletes showed significant underrepresentation of the ACVR2A rs3764955 GC - MSTN rs11333758 AA genotype combination. In the same group, we observed a significant overrepresentation of the ACVR2A rs3764955 GC - MSTN rs11333758 –/– and the ACVR2A rs3764955 CC - MSTN rs11333758 –/– genotype combinations.ConclusionsWe showed that the specific genotypes of the MSTN rs11333758 and ACVR2A rs3764955, either individually or in gene‒gene combination, are significantly associated with athletes’ competition level in the Polish population, especially in the mixed-sports athlete group. Thus, although further research is required, these polymorphisms, alone or in combination with other polymorphisms, are among the numerous candidates that could explain individual variations in muscle phenotypes.

The Effect of asymptomatic versus mild symptomatic COVID-19 infection on male athletic performance: A cross-sectional clinical research

Objective: Novel Coronavirus Disease 2019 (COVID-19) pandemic has affected the whole world and still host many obscurities. Researches involving athletes investigated the lifestyle, athletic performance and psychological alterations compared to pre-pandemics and returning-to-sports process. But, knowledge about the past symptomatic COVID-19 effects on athletic performance is immature. Athletes are prone to asymptomatic or mild symptomatic COVID-19 rather than severe form; so this study aimed to compare the muscular athletic performance, cardiorespiratory function and psychological condition after COVID-19 between asymptomatic and mild symptomatic athletes. Materials and Methods: This case-control designed study recruited a total of 40 young adult male long-distance runners who survived COVID-19 asymptomatically (n=20), and with mild symptoms (n=20). All of the subjects had completed the isolation period and been approved to return-to-sports. The age, anthropometric properties, athletic license term and dominant hand and foot sides of the subjects were recorded. The muscular strength of upper limb, isokinetic and isometric muscular strengths of lower limb flexor and extensors, and VO2max were measured. The self-reported depression, anxiety and COVID-19-related fear were evaluated. Results: The values of all muscular strength parameters, VO2max and anxiety level were similar between the groups (p&gt;0.05). However, the levels of depression (p=0.048) and COVID-19-related fear (p=0.012) were significantly higher in mild symptomatic group in comparison with asymptomatic (p&lt;0.05). Conclusions: Mild symptomatic COVID-19 did not affect muscular athletic performance and cardiorespiratory fitness, but caused psychological disorder in comparison with asymptomatic infection. In case of COVID-19, the psychological state of the athlete should be paid close attention. We suggest the supply of adequate and quick psychological support while targeting the previous level of physical fitness and athletic performance in the returning-to-sports process.

Ultra-Endurance triathlon competition shifts fecal metabolome independent of changes to microbiome composition.

Understanding changes to gut microbiota composition and metabolic output in response to acute exercise may be necessary for understanding the mechanisms mediating the long-term health and performance benefits of exercise. Our primary objective was to characterize acute changes in the fecal microbiome and metabolome following participation in an ultra-endurance (3.9 km swim, 180.2 km bike, 42.2 km run) triathlon. An exploratory aim was to determine associations between athlete-specific factors [race performance (i.e., completion time) and lifetime years of endurance training] with pre-race gut microbiota and metabolite profiles. Stool samples from 12 triathletes (9 males/3 females; 43 ± 14 yr, 23 ± 2 kg/m2) were collected ≤48 h before and the first bowel movement following race completion. Intra- and inter-individual diversity of bacterial species and individual bacterial taxa were unaltered following race completion (P > 0.05). However, significant reductions (P < 0.05) in free and secondary bile acids [deoxycholic acid (DCA), 12-keto-lithocholic acid (12-ketoLCA)] and short-chain fatty acids (butyric and pivalic acids), and significant increases (P < 0.05) in long-chain fatty acids (oleic and palmitoleic acids) were observed. Exploratory analyses revealed several associations between pre-race bacterial taxa and fecal metabolites with race performance and lifetime history of endurance training (P < 0.05). These findings suggest that 1) acute ultra-endurance exercise shifts microbial metabolism independent of changes to community composition and 2) athlete performance level and training history relate to resting-state gut microbial ecology.NEW & NOTEWORTHY This is the first study to characterize acute changes in gut microbial ecology and metabolism following an ultra-endurance triathlon. We demonstrate changes in gut microbial community function, but not structure, as well as several associations between gut microbiome and fecal metabolome characteristics with race completion time and lifetime history of endurance training. These data add to a small but growing body of literature seeking to characterize the acute and chronic effects of exercise on the gut microbial ecosystem.

ANALYSIS OF THE LEVEL OF AEROBIC ENDURANCE (VO2MAX) ON THE PERFORMANCE OF BANDUNG CITY HOCKEY ATHLETES

Aerobic endurance level (VO2max) is an important part of a hockey athlete's performance. It is very important to reduce fatigue and fatigue when playing, while it can be an advantage in game tactics. Therefore, the purpose of this researcher is to prove that there is a relationship between the level of aerobic endurance (VO2max) and the performance of hockey athletes. This research method uses descriptive quantitative with correlation technique research design. The sample used was 24 Bandung City hockey athletes including 12 male athletes and 12 female athletes and, sampling using total sampling techniques. The instruments used are the Multistage Fitness Test and GPAI (Game Performance Assessment Instrument) for the performance level of hockey athletes. The results of the study analyzed using the Spearman's Rho test on SPSS stated that the data from the average value of the aerobic endurance level (VO2max) of room hockey was 50.00 with a standard deviation value of 10.01 and the lowest score was 37.52, the highest score was 65.82 and the total score was 1200. Meanwhile, the average value of athlete performance is 0.77 with a standard deviation value of 0.074 and the lowest score of 0.67, the highest score of 0.94 and a total score of 18.40. The correlation coefficient of the two variables is unidirectional which is positive 0.567 in the interpretation of moderate correlation. So the results of this study there is a relationship between the level of aerobic endurance (VO2max) on the performance of hockey athletes.

Septic inflammation of the bicipital bursa: clinical, imaging, and surgical findings in nine horses.

To describe the etiologies, clinicopathologic findings, diagnostic modalities employed, treatments, and outcome associated with cases of septic bicipital bursitis. 9 horses. Medical records of horses diagnosed with septic bicipital bursitis between 2000 and 2021 were reviewed. Horses were included if synoviocentesis of the bicipital bursa revealed a total nucleated cell count of ≥ 20,000 cells/µL with a neutrophil proportion of ≥ 80%, a total protein concentration of ≥ 4.0 g/dL, and/or the presence of bacteria on cytology, or positive culture of the synovial fluid. Information retrieved from medical records included signalment, history, clinicopathologic variables, diagnostic imaging findings, treatment, and outcome. Trauma was the most common inciting cause (n = 6). Synoviocentesis using ultrasonographic guidance was performed in all cases and showed alterations consistent with septic synovitis. Radiography identified pathology in 5 horses, whereas ultrasonography identified pathology in all horses. Treatment consisted of bursoscopy (n = 6) of the bicipital bursa of which 1 was performed under standing sedation, through-and-through needle lavage (3), bursotomy (2), or medical management alone (2). Five (55.6%) horses survived to discharge. Long-term follow-up was available for 3 horses and all were serviceably sound, with 2 in training as pleasure horses and 1 case continuing retirement. Ultrasonography was the most informative imaging modality and paramount in obtaining synovial fluid samples for definitive diagnosis of septic bicipital bursitis. Bursoscopy performed under standing sedation is a feasible treatment option. Horses treated for bicipital septic bursitis have a fair prognosis for survival and may return to some level of athletic performance.

Mind-over-body beliefs in sport and exercise: A driving force for training volume and performance, but with risks for exercise addiction

We assume that athletic success is associated with certain beliefs that on the one hand promote performance-enhancing behavior (training volume), but on the other hand can also be detrimental to health (sports addiction). These beliefs are succinctly characterized by the title of the 9-item “Mind-over-Body” scale presented here. They are the three beliefs that 1) athletic performance requires a high level of effort, 2) that willpower plays an important role in athletic success, and 3) that athletic success requires pain tolerance. A total of six web-survey-based studies with a total of 1121 participants (approximately gender parity), including individuals with different levels of athletic performance (no competition; amateur sport; regional, national, or international competition), examined the psychometric network and construct and criterion validity of the MoB scale. Exploratory graph analyses, which included the studies with the largest sample sizes, showed that the three belief components (effort, willpower, pain) form separable communities within the MoB network and that the MoB items form communities distinct from self-control and self-efficacy. Meta-analyzed correlations across all six studies showed low positive correlations with self-control and self-efficacy. In terms of criterion validity, MoB beliefs were positively correlated with training volume and exercise addiction. We discuss MoBs as “on the edge of unhealthy” and place MOBs within a framework of related but distinct concepts.

"I hardly have a problem […] I have my period quite rarely too": Female football players' and their coaches' perceptions of barriers to communication on menstrual cycle.

Symptoms related to the menstrual cycle (MC) affect the performance level and health of female athletes in various ways. Previous research has reported MC symptoms such as pain, mood disturbance, reduced coordination and competition distraction as well as diminished performance levels and an increased injury risk among female elite athletes. Despite this, the coach-athlete communication related to the female hormonal cycle is limited. The aim of the present study was to explore the perceptions of MC communication in a group of junior elite football players and their male coaches in a case study of one youth football team in a specific club in Norway. The study used a qualitative approach with semi-structured interviews. In total, 8 female junior elite players (aged 16-20) from a Norwegian football team and 2 of their male coaches participated in the study. The data analysis revealed two main communication barriers: 1. interpersonal barriers (e.g., false assumptions about the coach/athletes and social discomfort) and 2. knowledge barriers (e.g., unaware/perceptions of insufficient knowledge levels). As the players seemed to be unaware of their insufficient MC knowledge (e.g., failed to see a connection between the MC and their health and performance level), the coaches perceived their knowledge as insufficient and coped mainly by outsourcing MC communication to female staff and apps. Hence, the MC communication was hindered by both the athletes and the coaches (e.g., mutual avoidance). In line with previous research, this study supports that there is a need for developing effective strategies to overcome the interpersonal barriers and knowledge gaps.

Digital media and mental health in adolescent athletes

Although digital media are increasingly important for adolescent athletes, few studies explore their influence on mental health in this population. This study aimed to examine this relationship in 591 German adolescent athletes (aged 12–19 years) from 42 different sports. Longer daily social media usage was connected to increased negative affect and dysfunctional eating patterns. Similar results were found for cognitive-behavioral symptoms of excessive media usage and mental health. Structural equation modeling revealed these relationships were mediated by social comparison and quality of sleep. Higher athletic performance level was related to increased social comparison, but not to quality of sleep, negative affect, and dysfunctional eating. The negative relationship between excessive media usage and sleep was stronger in competitive and elite than in recreational athletes. Results imply digital media should receive attention when aiming to improve mental health in athletes. Relevant targets for future intervention could be social comparison and sleep.

Use of Locking Compression Plate and Locking Compression T-Plate for Surgical Arthrodesis of the Carpometacarpal and Distal Tarsal Joints in 13 Horses.

The aim of this study was to describe the use of the locking compression plate (LCP) and locking compression T-plate (LCTP) in cases of carpometacarpal and distal tarsal arthrodesis for the treatment of osteoarthritis and small carpal or tarsal bone fractures, and to document clinical outcomes. Case records of horses treated with carpometacarpal or distal tarsal arthrodesis via internal fixation using an LCP or LCTP between 2013 and 2021 were reviewed. All cases were evaluated retrospectively. Follow-up information was gained via phone conversation with owners and referring veterinarians. Data were collected for 13 horses that fulfilled the study criteria. A total of eight horses underwent distal tarsal arthrodesis, and five underwent carpometacarpal arthrodesis. Twelve of thirteen horses went back to some level of athletic performance. Eight of 13 returned to the same level, while 4 of 13 returned to a lower level. Minor postoperative complications were recorded in 3 of 13 cases, with all horses suffering manageable short-term complications returning to the same level of work. Two horses suffered a major complication, with one resulting in euthanasia. Carpometacarpal and distal tarsal arthrodesis performed using the LCP and LCTP allowed all surviving horses in the study to obtain immediate postoperative comfort and eventual return to use.

Correlation analysis of national elite Chinese male table tennis players' shoulder proprioception and muscle strength.

BACKGROUNDShoulder is the most injured part in table tennis players, and it takes multiple roles in transmitting power and striking the center of the ball during the stroke. Proprioception is strongly correlated with high level of athletic performance. It is customary to assume that there is a correlation between proprioception and muscle strength and therefore proprioceptive assessment and rehabilitation is often neglected.AIMTo investigate the correlation between isokinetic muscle strength and proprioception in the internal and external rotation muscle groups of elite Chinese male table tennis players, to provide reference for physical training and rehabilitation of elite table tennis players.METHODSA total of 19 national elite table tennis players from the Chinese National Table Tennis Team were recruited in this research. All of them had more than 10 years training experience and had participated major competitions such as the National Games and World Youth Championships. IsoMed 2000 was used to test the peak torque of internal and external rotation isokinetic concentric contraction of the athletes' bilateral shoulder joints at low speed (60°/s) and high speed (180°/s) respectively; IsoMed 2000 was used to conduct the Joint Position Reproduction test to evaluate the athletes' proprioceptive ability capacity at low speed (60°/s) and high speed (180°/s) respectively. If the data satisfied the normal distribution, the correlation between the differences in peak torque s and angles in different directions was analyzed using a Pearson simple linear model; otherwise, Spearman correlation analysis was used. The comparison of proprioceptive ability between the table tennis racket-holding hand and non-racket-holding hands was performed using independent samples t-test if the data satisfied a normal distribution; otherwise, the Mann-Whitney U test was used.RESULTSThere was no direct linear correlation between the strength and proprioceptive correlation analysis at slow speed (60°/s) and fast speed (180°/s) in the racket-holding hand; At the slow speed (60°/s) and fast speed (180°/s), there was no correlation between muscle strength and proprioception in the non-racket-holding hand except for the internal rotation variable error (VE) and external rotation relative peak torque, which showed a moderate positive correlation (r = 0.477, P < 0.05), (r = 0.554, P < 0.05). The internal rotation’s constant error (CE) and VE were 1.06 ± 3.99 and 2.94 ± 2.16, respectively, for the racket-holding hand, and -3.36 ± 2.39 and 1.22 ± 0.93, respectively, for the non-racket-holding hand; the internal rotation’s CE, VE of the racket-holding hand was lower than that of the non-racket-holding hand, and there was a highly significant difference (P < 0.01).CONCLUSIONThere was no correlation between muscle strength and proprioceptive function in the internal and external rotation of the racket-holding hand’s shoulder in elite Chinese male table tennis players. These results may be useful for interventions for shoulder injuries and for the inclusion of proprioceptive training in rehabilitation programs.

The effect of caffeine on countermovement jump performance in recreationally trained women habituated to caffeine

Introduction. The main goal of this study was to examine the effect of acute intake of 3 mg/kg/body mass (b.m.) of caffeine (CAF) on countermovement jump (CMJ) performance in recreationally trained women habituated to CAF. Material and Methods. 17 healthy recreationally trained women habitually using CAF participated in the study. The experiment followed randomized, cross-over, double-blind design under three different conditions: control test (CONT) or consumed placebo (PLAC) or consumed 3 mg/kg/b.m. of CAF (CAF-3). Each participant performed 2 sets of 2 CMJ. The following variables were recorded: concentric peak velocity (PV), peak power (PP) and jump height (JH). Results. The two-way repeated measure ANOVA (substance × set) revealed no statistically significant interaction and main effects for all measured variables between conditions. In comparison to the CONT and PLAC, the intake of CAF-3 was not effective at increasing PV (p = 0.533), JH (p = 0.417) and PP (p = 0.871) during 2 sets of the CMJ. Conclusions. This study suggests that 3 mg/kg/b.m. of CAF did not improve CMJ height in recreationally trained women habituated to CAF. Furthermore, the level of athletic performance might be considered a factor in regard to CAF ergogenicity.

효율성 기반 한국 프로축구 구단의 경기력 평가 : K리그 2021년 시즌을 중심으로

Purpose Professional sports clubs pursue profit through various economic activities, and for this purpose, they try to have a high level of athletic performance. This study evaluates that the athletic performance based on efficiency targeting 22 Korean professional football clubs(K-League 1, K-League 2) in the 2021 season of K-League. Methods A DEA(Data Envelopment Analysis) model was used to evaluate the athletic performance based on efficiency. For input variables, budget and number of players were selected. As for output variables, victory points, difference in gains and losses, and ball possession were selected. Data was collected from the Korea Professional Football Federation, K-League data center, and sports data-related websites. Results As a result of evaluating the athletic performance of each league based on efficiency, FC-11(Suwon FC) in K League 1 and FC-19(Gimcheon Sangmu FC) in K League 2 were selected as the best teams. In addition, as a result of evaluating the athletic performance between all clubs, FC-19(Gimcheon Sangmu FC) as the best team and FC-1(Daegu FC) as the club with the lowest athletic performance were evaluated. Conclusion Through this method, it will be possible to induce competition between professional football clubs and maximize their athletic performance. In addition, the club will be able to pursue profit through various economic activities along with public interest by maximizing their athletic performance.

The concept and practice of a football training program: An understanding in the transition period

The football competition period lasts 6-9 months on an annual training program. Long competitions certainly result in physical and mental fatigue in athletes. In the theory of training periodization, a period of rest after the end of the competition (transition period) gives athletes the opportunity to rest and psychic relaxation while maintaining optimal physical condition. This paper seeks to review the literature relevant to the concepts and practices in the transition period. Discussion covers two main things: the facts that occur during the transition period and exercises that athletes need to do during the transition period. The results of this discussion aim to make athletes and coaches understand the things that occur during the transition period and what exercise practices, such as what athletes need to do to prevent the potential detraining syndrome. So that in the preparation period of the new season, the athlete's performance level is in good condition.

Long-Term Outcome of Horses Undergoing Unilateral Mandibular Condylectomy and Meniscectomy for Temporomandibular Joint Disease.

BackgroundThere are no reports describing the long-term outcome of sport horses undergoing unilateral mandibular condylectomy with meniscectomy (UMC) for treatment for severe temporomandibular joint (TMJ) disease (TMD). Whether horses undergoing UMC require a specialized diet, can return to riding with a bit, or return to intended function after surgery is unknown.ObjectiveTo determine the long-term outcome of horses undergoing UMC for treatment of severe TMD.Study DesignA multi-institutional, retrospective study.MethodsMedical records obtained from seven equine referral hospitals of horses with severe TMD that underwent UMC were reviewed. Details regarding the presenting complaints, results of clinical examination, findings of diagnostic imaging, surgical technique, and outcome (including long-term follow-up with an owner questionnaire) were recorded.ResultsEleven horses fit the inclusion criteria. Three had severe idiopathic osteoarthritis, and eight had confirmed septic osteoarthritis of the TMJ. The most common post-operative complications were drainage and peri-incisional swelling (n = 5). One horse developed a hematoma at the surgical site because the facial artery was inadvertently transected during the approach, causing the condylectomy to be postponed. All horses were discharged alive from the hospital, and 10 returned to their previous or intended use. All had complete resolution of clinical signs of TMD. One mare was retired from athletic use due to her genetic value as a broodmare. One horse was euthanized 2 years after UMC due to progressively worsening of clinical signs of temporohyoid osteoarthropathy (THO), which were not present before surgery. When available, owner satisfaction of the results of the procedure was excellent.Main LimitationsSample size; multiple institutions; owner bias.ConclusionsUnilateral mandibular condylectomy should not be considered a salvage procedure. Horses treated for severe TMD by UMC can return to their previous or intended level of athletic performance and do not require a specialized diet.

Impact of sports on temporomandibular dysfunction: a comparison of competitive and recreational female athletes as well as female non-athletes

ObjectivesThe present study was conducted to investigate the correlation between (competitive) sports and the occurrence of temporomandibular dysfunctions (TMD) by comparing the prevalences in competitive, recreational, and non-athletic women.Materials and methodsA total of 138 women between the ages of 18 and 45 were interviewed about symptoms of TMD by means of a questionnaire. Based on their athletic performance level, the participating women were classified as competitive athletes, recreational athletes, or non-athletes (each group n = 46).ResultsSymptoms of TMD were notably less frequent in competitive female athletes (52.2%) than in recreational female athletes (63.0%) and female non-athletes (60.9%). With increasing training load, the prevalence of TMD decreased in both the competitive and recreational female athlete groups.ConclusionsAthletic activity in general seems to have a positive effect on the occurrence of TMD. Competitive female athletes appear less likely to suffer from symptoms of TMD than recreational athletes and non-athletes. One possible explanation for this could be the better supervision by qualified trainers and physiotherapists in competitive sports.Clinical relevancePatients should be motivated to engage in sports as a protective measure against symptoms of TMD. However, it is important to ensure that they are properly instructed by experienced personnel in order to avoid unphysiological strain and negative consequences.

The differentiation of single and dual career athletes falls short: A person-oriented approach to characterize typical objective life situations of elite athletes

Research concerning athletic career development in high-performance sport typically uses demographic data, sport characteristics or pursuing a dual career (i.e. having an educational or vocational career simultaneous to the athletic career) to identify developmental processes. In defiance of these attempts, considerable heterogeneity remains within these subgroups of the elite athlete population. In line with the person-oriented approach, the objective of this study was to develop a comprehensive typology of athletes with similar objective life situations by considering both sport-related as well as non-sport related aspects. To this end, data were collected about athletic performance level, weekly amount of working time (i.e. sport-related activities, education, and vocation), and financial information (i.e. gross annual income and income generated from sport). Based on a sample of 733 elite athletes, a cluster analysis was performed to divide the sample into groups of similar patterns on the aforementioned factors. Five different athlete patterns were found: (1) working dual career athletes, (2) high-income professional athletes, (3) medium-income professional athletes, (4) family-supported athletes, and (5) student dual career athletes. These findings support the dual career literature of separating dual career ( Cluster 1 and Cluster 5) from single career athletes, which, in turn, should also not be regarded as a single population, but further divided ( Cluster 2, Cluster 3, and Cluster 4). This typology may aid federations and practitioners within athletic career development in providing individual assistance for elite athletes.

Relative energy deficiency in sport: modern approaches to diagnostics, treatment and prevention

In recent years, close attention has been paid to energy deficiency in professional athletes. More and more studies confirm the widespread prevalence of relative energy deficiency syndrome in sports and its relationship with various pathological conditions that lead to a decrease in the level of athletic performance. Nowadays the possibilities of early diagnosis and treatment of this syndrome are being carefully studied, and clinical protocols are being actively developed to facilitate the early detection of energy deficiency. The aim of the study was to summarize the modern data on the influence of the syndrome of relative energy deficiency in sports on the health and performance of athletes, as well as to consider effective methods for the diagnosis, treatment and prevention of this syndrome. Material and methods. The search was carried out using the Google Academy engine and electronic databases PubMed, MEDLINE, EMBASE, Scopus, Web of Science, eLIBRARY for the period from 2017 to 2021. For the search, we used keywords and their combinations: "relative energy deficit in sports", "female athlete triad", "menstrual dysfunction", "osteoporosis". Results. Based on our analysis, we can conclude that the syndrome of relative energy deficit in sports has a multicomponent negative effect on the athlete's organism and negatively affects his performance, well-being and sports results. Diagnosis of this condition is challenging due to the nonspecificity and variety of symptoms. Key diagnostic methods include physical examination, anamnesis gaining, dual energy X-ray absorptiometry, bioimpedance body composition analysis, and hormonal profile studies. Additional methods include: electrocardiography, study of the basal metabolic rate, hematological examination (hemoglobin, ferritin, etc.), determining the level of energy consumption using diaries of food and physical activity, determining blood vitamin level, etc. To facilitate the screening, diagnosis and follow-up of athletes, it is possible to use specially developed clinical protocols. Non-drug nutritional correction and optimal training plan are the main methods of treatment and prevention of energy deficiency. If this type of treatment is ineffective, hormone therapy should be considered. It is recommended to use transdermal estrogen therapy in combination with shortterm progestin therapy. In some cases, when very low bone mineral density or delayed fracture consolidation is detected, it is possible to use recombinant parathyroid hormone. Conclusion. Due to the relatively high prevalence of relative energy deficiency syndrome in athletes of both sexes and its long-term negative impact on athlete health and performance, further research is needed to improve the effectiveness of early diagnosis, prevention and treatment of pathological conditions associated with malnutrition.

Peak Age and Relative Performance Progression in International Cross-Country Skiers.

To quantify peak age and relative performance progression toward peak age in cross-country skiing according to event type, sex, and athlete performance level. International Ski Federation (FIS) points (performance expressed relative to the best athlete) of athletes born between 1981 and 1991, competing in junior world championships or finishing top 30 in world championships or Olympics, were downloaded from the FIS website. Individual performance trends were derived by fitting a quadratic curve to each athletes FIS point and age data. Peak age was 26.2 (2.3) years in distance and 26.0 (1.7) years in sprint events. The sex difference in peak age in sprint events was ∼0.8 years (small, P = .001), while there was no significant sex difference in peak age in distance events (P = .668). Top performers displayed higher peak ages than other athletes in distance (mean difference, ±95% confidence limits = 1.6y, ±0.6y, moderate, P < .001) and sprint events (1.0, ±0.6y, moderate, P < .001). FIS point improvement over the 5 years preceding peak age did not differ between event types (P = .325), while men improved more than women in both events (8.8, ±5.4%, small, P = .002 and 7.5, ±6.4%, small, P = .002). Performance level had a large effect on improvement in FIS points in both events (P < .001). This study provides novel insights on peak age and relative performance progression among world-class cross-country skiers and can assist practitioners, sport institutions, and federations with goal setting and evaluating strategies for achieving success.