Sport Athletes Research Articles

Somatic Structure and Ultrasound Parameters of the Calcaneus Bone in Combat Sports Athletes in Relation to Vitamin D3 Levels.

Background/Objectives: Physical activity is widely recognized for its beneficial effects on bone density during adolescence, which could lead to enhanced bone density in later life, thus acting as a health-promoting activity with long-lasting implications. However, not all studies are conclusive regarding the type, intensity, duration, and frequency of the most effective physical activities. This study focuses on combat sports athletes and examines the relationship between their somatic build and heel bone parameters using ultrasound (USG) and their vitamin D3 levels. Methods: The study included 40 male athletes specializing in various combat sports. The measurements of body height, body mass, skinfold thickness, and bone widths at multiple sites were performed to estimate the somatic build. The USG parameters of the heel bone and the blood levels of vitamin D3 were also recorded. Statistical significance was determined using one-way ANOVA, with differences among sports disciplines also examined. Results: The study found significant differences in the body composition and USG bone parameters among athletes from different combat sports (p ≤ 0.05). The calcaneus stiffness index (SI) and speed of sound (SOS) were significantly higher in athletes with normal vitamin D3 levels compared to those with below-normal levels (p = 0.0015 and p = 0.001, respectively). These findings suggest that vitamin D3 may influence bone stiffness and density. Conclusions: The study underscores the importance of maintaining adequate vitamin D3 levels to support bone mineralization in athletes, particularly those training indoors with limited exposure to sunlight. It also highlights the potential of using USG as a non-invasive method to assess bone health, aiding in the optimization of training programs to prevent injuries and improve performance.

Longevity of Polish top-class athletes compared to other social elites and well-known people in the years 2001-2021.

The aim of this work is to initiate or revive a scientific discussion on the impact of professional life on the parameters of human lifespan. Presented analysis is based on 8578 Polish elite or well-known person who died in 2001-2021. The results of the conducted analysis indicate that in the case of men the highest values of the median age at death were characteristic of freelancers (median [Me] ± quartile deviation [QD] 85.5±8.5 years), followed by scientists and academic teachers of the biological and medical specialty (Me±QD 84.0±7.5 years) and officers of power structures (Me±QD 83.5±8.5 years). Subsequently, the highest value of the median age at death was recorded for social activists (Me±QD 83.0±9.5 years), clergy (Me±QD 82.0±7.5 years) and scientists and academic teachers of specialties other than biological and medical (Me±QD 82.0±8.0 years). Significantly, at the very end of this list are athletes (Me±QD 77.0±9.0 years). Nevertheless, the results of the analysis confirm that professional athletes are characterized by higher median age at death compared to the general population. Analysis made only within athletes group demonstrated that the parameters of lifespan of athletes of endurance disciplines (Me±QD 78.0±8.0 years) are the most favorable compared to athletes of other disciplines, in particular in compare to team sports athletes (Me±QD 75.0±10.0 years) or combat sports athletes (Me±QD 75.0±7.1 years). What is new and innovative in this paper is comparing the lifespan characteristics of athletes in comparison to widely represented group of other professions with higher socio-economic status. Unexpectedly, the lifespan of athletes occurred to be lower than for fast all other analyzed occupational groups, except mainly of entertainment musicians. Finally, the results presented in this paper emphasize the need to analyze the lifespan characteristics of athletes in a broader scope than only in relation to the general population. Int J Occup Med Environ Health 2024;37(3):335-50.

Distal Triceps Tendon Repair in Strength Athletes Leads to Satisfactory Return to Sports: A Retrospective Analysis of 22 Cases.

Background: Distal triceps brachii tendon rupture (DTTR) is a relatively rare injury that is common in bodybuilding and high-intensity contact sports and can lead to significant functional impairment of the elbow joint. This study was conducted to evaluate clinical outcomes and the rate of return to sports among competitive bodybuilders and high-demand strength athletes after surgical repair of DTTR. Methods: This retrospective case series was performed in an institutional setting in tertiary health care. Return to sports of 22 competing or high-demand strength athletes (meaning three or more exercises per week) were analyzed pre- and postoperatively after surgical repair of DTTR using a hybrid technique of transosseous sutures and anchor fixation. Descriptive statistics were used to analyze demographic variables, and independent and paired t-tests were used to assess clinical outcomes. Results: The follow-up showed that from pre- to postoperatively, there was no deterioration in the number of sports disciplines (2.4 and 2.5 sporting activities per person, respectively; p = 0.540) or in the frequency of weekly training (4.1 and 4.1 times per person, respectively; p = 0.329). The postoperative visual analog scale for pain (from 6.0 to 1.6, p < 0.001), level of fitness (from 5.1 to 2.6, p = 0.002), and ability to train (from 5.2 to 1.3, p < 0.001) improved significantly. The time of return to sports was 1.5-3 months and 4-6 months after the surgery for ten patients each. The overall rate of return to sports was 95%, whereas 86% returned to the preinjury level of sporting activity. Conclusions: Repair of DTTR leads to high rates of return to sports in competitive athletes.

Clinical Outcomes After Mini-Open Subpectoral Biceps Tenodesis

Background Long head of the biceps tendon pathology is a common cause of shoulder pain. Current surgical treatment options for long head of the biceps tendon disorders include tenotomy and tenodesis. Younger and high-demand patients are usually treated with tenodesis since tenotomy is associated with increased biceps pain and cramping, cosmetic deformity and patient dissatisfaction. Previous studies have shown biomechanical advantages of subpectoral open approach over arthroscopic suprapectoral approach, with less biceps over tension and increased ultimate load to failure. Despite this, there is a lack of consensus in the literature regarding the management of biceps-related pathology. Methods We retrospectively reviewed all patients who underwent subpectoral biceps tenodesis with unicortical endo-button fixation between January 2015 and December 2019. Only patients who had a minimum of 24 months follow-up were included in the study. We reviewed patient demographics. The American Shoulder and Elbow Surgeons and Visual Analogue score were assessed and complications were recorded. Results A total of thirty-two patients were enrolled in this study. 15 were young patients and sports athletes with SLAP (Superior Labrum from Anterior to Posterior) lesions or isolated biceps instability and the remaining 17 were middle-age patients with degenerative biceps disease and concomitant pathology. The mean follow-up time was 36 months. SLAP lesions group average age was 24,3 and degenerative group average age was 53,8. The ASES score and the VAS score and were statically significative better in the isolated subpectoral tenodesis due to SLAP lesions 99,8 and 0,1 respectively in comparison with the degenerative group, 85,7 and 1,5 respectively. We recorded two complications. One case of superficial infection and one case of a patient that was concomitant submitted to arthroscopic rotator cuff tear repair with persisting shoulder pain. There was no case of failure of fixation or associated Popeye deformity. Conclusions Subpectoral biceps tenodesis with unicortical endo-button fixation is a viable treatment option for patients with symptomatic biceps disease. Anterior shoulder pain and biceps symptoms were resolved with this technique. Patients with coexistent rotator cuff lesion may have less favorable outcomes.

The Relationship Between Motivational Regulations and Intention to Continue Sport in Injured Athletes

Background: Injured athletes are prone to quit sports due to several factors, including changes in motivational regulations, and their intention to continue in sport comes with special challenges. Objectives: Based on the self-determination theory (SDT), we investigated the relationship between motivational regulations and intention to continue sport in athletes with a history of injury. Methods: One hundred twenty-one injured athletes (M age = 24.68, SD = 7.74) participated in this study and filled out a multi-section questionnaire. Results: Path analysis showed that injured athletes’ introjected regulation positively predicted their intention to continue in sport (path coefficient = 0.30). Conclusions: Findings showed that introjected regulation would consider as impornat criteria in persitising sport in athletes after experiencing injury.

Trends in recovery from repeated concussion in collegiate athletes in collision sport

Sports-related concussion (SRC) is a growing concern across all age groups, particularly among collegiate athletes facing rigorous academic and athletic challenges linked to performance. For this reason, a large body of research is about this demographic. While our approach to studying concussions is more sophisticated than ever, much remains to be learned. This review addressed three specific areas of literature concerning SRC. First, does a previous concussion history predispose an individual to future head injuries? Second, does the number of concussions impacts return to play (RTP) time? And third, does the interval between concussions affect the recovery trajectory? While this is not a comprehensive review, we have compiled compelling evidence strongly favoring all three of these questions.

Prevalence and Experience of Urinary Incontinence Among Elite Female Gaelic Sports Athletes.

This study was aimed at identifying the prevalence and experience of urinary incontinence (UI) among elite female Gaelic sports athletes in Ireland. A cross-sectional study comprising an anonymous online survey of elite Gaelic sports (Camogie and Ladies Gaelic Football) players. Players were asked about their background information, knowledge of the pelvic floor and practice of pelvic floor muscle training (PFMT), as well as their experiences of UI. The prevalence and severity of UI was assessed using the International Consultation on Incontinence Questionnaire-UI Short Form (ICIQ-UI-SF) questionnaire. Logistic regression was used to evaluate risk factors. A total of 185 players responded (25 ± 5years) and 95.3% (n = 176) were nulliparous. Forty-one percent (n = 75) of players had learned about PFMT and 13% (n = 24) had performed PFMT within the last 4 weeks. The ICIQ-UI-SF was completed by 159 players, with UI reported by 61.6% (n = 98), 52% (n = 51) of whom experienced stress urinary incontinence (SUI). A significant association was found between UI and longer weekly sporting activity time (OR 1.05, 95% CI 1.002 to 1.008). Parous players were more likely to experience UI (p = 0.025). Jumping and sprinting activities were the most commonly reported triggers, with pre-voiding and wearing protection (liners, pads) the most commonly adopted UI management strategies. Only ten players reported receiving treatment for UI. Urinary incontinence is prevalent among this cohort of elite female Gaelic sports athletes. Many players used strategies to manage their UI whereas few sought help for what is a treatable condition. Findings suggest the need for education of players regarding pelvic floor health and treatment options available.

Logo Usage of Disc Golf Athletes on Instagram: The Prevalence of Athlete, Endorser, and Sponsor Brands

Previous research has examined how athletes present themselves on social media, and the role that athletes play in sponsorships and endorsements. The current investigation, though, evaluates how athletes present themselves, their personal brand, and the brands they work with by looking at logo usage specifically. A content analysis of 35 professional disc golf athletes’ Instagram accounts before and after the start of the 2023 season was performed. The 494 posts (n = 1,396) were categorized by the type of self-presentation, and the utilization of logos within the images. Results indicated that logo usage was largely the same between athletes in two different gender-based divisions, and that endorser, sponsor, and athlete logos were utilized more often when individuals presented themselves as an athlete. Additionally, endorser logos were most frequently utilized in athlete Instagram posts. Implications for niche sport athletes and their brands are discussed.

Uncovering the hidden effects of repetitive subconcussive head impact exposure: A mega-analytic approach characterizing seasonal brain microstructural changes in contact and collision sports athletes.

Repetitive subconcussive head impacts (RSHI) are believed to induce sub-clinical brain injuries, potentially resulting in cumulative, long-term brain alterations. This study explores patterns of longitudinal brain white matter changes across sports with RSHI-exposure. A systematic literature search identified 22 datasets with longitudinal diffusion magnetic resonance imaging data. Four datasets were centrally pooled to perform uniform quality control and data preprocessing. A total of 131 non-concussed active athletes (American football, rugby, ice hockey; mean age: 20.06 ± 2.06 years) with baseline and post-season data were included. Nonparametric permutation inference (one-sample t tests, one-sided) was applied to analyze the difference maps of multiple diffusion parameters. The analyses revealed widespread lateralized patterns of sports-season-related increases and decreases in mean diffusivity (MD), radial diffusivity (RD), and axial diffusivity (AD) across spatially distinct white matter regions. Increases were shown across one MD-cluster (3195 voxels; mean change: 2.34%), one AD-cluster (5740 voxels; mean change: 1.75%), and three RD-clusters (817 total voxels; mean change: 3.11 to 4.70%). Decreases were shown across two MD-clusters (1637 total voxels; mean change: -1.43 to -1.48%), two RD-clusters (1240 total voxels; mean change: -1.92 to -1.93%), and one AD-cluster (724 voxels; mean change: -1.28%). The resulting pattern implies the presence of strain-induced injuries in central and brainstem regions, with comparatively milder physical exercise-induced effects across frontal and superior regions of the left hemisphere, which need further investigation. This article highlights key considerations that need to be addressed in future work to enhance our understanding of the nature of observed white matter changes, improve the comparability of findings across studies, and promote data pooling initiatives to allow more detailed investigations (e.g., exploring sex- and sport-specific effects).

Protracted exercise tolerance post-coronavirus disease 2019 in endurance athletes: A survey.

The global coronavirus disease 2019 (COVID-19) pandemic irrevocably influenced our lives, yet research in a diversity of countries is lacking. Cardiorespiratory fitness may be impaired for up to a year post-COVID-19 infection. Our study aimed to compare acute and exertional symptoms, fatigue, and exercise performance in masters-age endurance athletes according to their return-to-sport status. A cross-sectional survey-based observational study of long-distance runners and cyclists was conducted. Data were stratified into two groups: those who returned to their pre-illness level of sport and those who did not and were compared statistically. A total of 308 survey responses were included in the analysis. The mean age of the athletes was 44.9 + 10.2 years, with 55.2% being male. The group that did not return to their pre-illness level of sport (31.5%) had more post-COVID sequelae, worse illness severity, with a higher frequency of resting and exertional symptoms, notably fatigue and dyspnoea. Decreased exercise capacity was correlated with increased physical fatigue scores. Almost one-third of endurance athletes suffered protracted exercise tolerance post-COVID-19. Long-term symptoms may be more consequential in this athlete population. Symptoms that may indicate cardiopulmonary consequences in recreational athletes should be investigated in order to facilitate return to sport and the important mental and physical benefits thereof. This will augment outcomes after respiratory tract infections and management of return to sport and expectations of endurance athletes.

Immediate and Transient Perturbances in EEG Within Seconds Following Controlled Soccer Head Impact.

Athletes in contact and collision sports can sustain frequent subconcussive head impacts. Although most impacts exhibit low kinematics around or below 10g of head linear acceleration, there is growing concern regarding the cumulative effects of repetitive sports head impacts. Even mild impacts can lead to brain deformations as shown through neuroimaging and finite element modeling, and thus may result in mild and transient effects on the brain, prompting further investigations of the biomechanical dose-brain response relationship. Here we report findings from a novel laboratory study with continuous monitoring of brain activity through electroencephalography (EEG) during controlled soccer head impacts. Eight healthy participants performed simulated soccer headers at 2 mild levels (6g, 4rad/s and 10g, 8rad/s) and three directions (frontal, oblique left, oblique right). Participants were instrumented with an inertial measurement unit (IMU) bite bar and EEG electrodes for synchronized head kinematics and brain activity measurements throughout the experiment. After an impact, EEG exhibited statistically significant elevation of relative and absolute delta power that recovered within two seconds from the impact moment. These changes were statistically significantly higher for 10g impacts compared with 6g impacts in some topographical regions, and oblique impacts resulted in contralateral delta power increases. Post-session resting state measurements did not indicate any cumulative effects. Our findings suggest that even mild soccer head impacts could lead to immediate, transient neurophysiological changes. This study paves the way for further dose-response studies to investigate the cumulative effects of mild sports head impacts, with implications for long-term athlete brain health.

Características Cineantropométricas en Jugadores Profesionales de Rugby Sevens

Introduction: Rugby sevens or 7s is a team sport, descended from rugby 15s or rugby union. It is considered a sport of high intensity and intermittent effort, where positions are very well defined but there is small between-athletes variability of physical characteristics. Objective: The goal of the study was to analyze the anthropometric characteristics, body composition, somatotype and proportionality in players of the Spanish rugby sevens team. Material and methods: Anthropometric variables were evaluated in 16 players in order to obtain information regarding body composition, somatotype and proportionality following the standard techniques proposed by the International Society for the Advancement of Kinanthropometry (ISAK). Results: The data obtained regarding height and weight, muscle percentage (45.05 ± 5.02), bone (16.25 ± 1.72) and fat percentage (7.98 ± 1.32) are comparable to the obtained information of rugby union players who play in the three quarters position. Participants were predominantly classified as balanced mesomorphs, which are characterized by increased skeletal muscle development. Discussion: Body composition as well as somatotype values are similar to other studies results according to elite athletes in intermittent sports that do not require high fat percentages. Conclusion: Despite being tall and with large body mass athletes, their high muscle percentage can provide this type of athlete greater power and speed, necessary to support the high demands of competition in this sport.

Elite Athletes and Worker Status

Abstract Recent research regarding the working conditions of elite athletes in Olympic sports in the European Union, Norway and the UK shows that most athletes are not in an employment relationship with a sports stakeholder such as a National Olympic Committee, sports governing body or club because legislation at a national level or the terms of a contract preclude their status as employees or workers. Elite athletes who are excluded from employee or worker status do not have access to valuable social and employment benefits and protections, for example, a pension entitlement or maternity benefits. This article highlights the complex contractual situation of elite athletes who are integrated into a national elite sports programme and the regulatory and legal frameworks in which they provide services during an athletic career and posits that elite athletes are workers irrespective of an athlete’s legal status designated under national law or contract.

A Study on the Characteristics of Sports Athletes' YouTube Channels and User Reactions.

This study examined the content characteristics and user responses of athlete-run sports YouTube channels, providing empirical insights for content production strategies and contributing to the development of athlete-run sports YouTube channels. Content analysis was conducted on 3306 videos posted on 20 popular YouTube channels of South Korean athletes from 1 January 2020 to 31 December 2021. The formal characteristics analyzed included video length, the presence of foreign language subtitles, paid advertisements, and information sources. The content characteristics examined were the types of sports events, main content themes, and whether the content matched the athlete's sport. Results revealed significant differences in content characteristics and user responses based on whether the athletes were active or retired. This study's distinctive contribution lies in highlighting the evolving role of athletes as content creators and providing strategic implications for enhancing the competitiveness of athlete-run sports YouTube channels. Future research should consider a broader range of sports YouTubers and a wider variety of YouTube channels to gain comprehensive insights into the sports content ecosystem on this platform.

Baseline Symptoms and Neurocognitive Performance Across Collision, Contact, and Non-Contact Female High School Athletes.

Our purpose was to represent a rare cohort of female collision sport athletes and investigate the association between sport type (collision, contact, non-contact), symptoms, and performance on baseline neurocognitive assessments. We conducted a cross-sectional study using baseline computerized neurocognitive scores (ImPACT) of 75,128 female high school student-athletes (age: 15.27 ± 1.05 years) playing multiple sports. The dependent variables were verbal memory, visual memory, visual motor speed, reaction time, and total symptom score. The independent variable was sport type, categorized as collision, contact, non-contact, adjusted for the effect of the following co-variables: age, concussion history, and comorbidities (learning disability, ADHD, psychiatric condition, headaches, migraines, speech therapy, special education, and repeating one of more years of school) using multivariable regression models. Female collision sport athletes reported significantly higher symptoms (9.81 ± 12.63) at baseline compared to contact (5.78 ± 9.25) or non-contact (6.39 ± 9.74) sport athletes (p < 0.001). Using non-contact sports as a reference, there was no significant association between collision sport participation and cognitive composite scores (verbal memory: β = -0.57, 95% confidence interval: -1.80, 0.66, p = 0.38; visual memory: β = -0.83, 95% confidence interval: -2.46, 0.79, p = 0.31; visual motor speed: β = -0.21, 95% confidence interval: -1.01, 0.59, p = 0.61; reaction time: β = 0.01, 95% confidence interval: -0.01, 0.02, p = 0.29). Participation in collision sports appears to be associated with baseline symptoms but not neurocognitive functioning among female adolescent athletes.

Enhancing athletic performance with complex contrast training: A Delphi study of elite strength and conditioning coaches

This Delphi study identifies how elite strength and conditioning coaches prescribe complex contrast training to team sport athletes. Thirty-eight elite strength and conditioning coaches with experience working in high performance settings participated in a three-round survey. Round one was used to collect open-ended responses regarding the programming of complex contrast training. Responses were formulated into statements for rounds two and three, where participants rated their level of agreement using a 9-point Likert scale (agreement threshold ≥80%). In round one, 139 statements were formulated. Twenty-seven statements reached consensus in round two, and four more in round three. Based upon consensus, complex contrast training is best used during the season and dedicated power blocks. It was recommended that strength and power exercises within complex contrast training pairings be performed for 3–4 sets of 3–4 repetitions. Loading of 85–90% of one repetition maximum (1RM) was recommended for strength exercises, with ∼two repetitions in reserve, and BW–30% 1RM for power exercises, with three minutes of rest between contrast sets. Upper body pressing, upper body throwing, lower body squatting and hinging, and lower body jumping and bounding exercises were recommended. Coaches reported using complex contrast training to enhance power-focused training, and because it is more time efficient. Complex contrast training may be a time efficient method of improving athletic performance when training time is limited. Results from this study can guide the development of complex contrast training programs for team-sport athletes, and provides valuable insight into how elite coaches enhance performance.

Characteristics of Vitamin D Concentration in Elite Israeli Olympic Athletes.

The prevalence of vitamin D deficiency has been a growing concern in recent years. Vitamin D is important in many of the body's physiological systems, such as the musculoskeletal, cardiovascular and immune functions. A deficiency of vitamin D in athletes may negatively impact both muscle functions and recovery and, thus, affect performance and increase the risk of injury. Many studies assessed the prevalence of vitamin D deficiency in athletes; however, as of today, there are no official recommendations/protocols for screening vitamin D levels in athletes, and only a few studies were performed in male and female elite athletes (i.e., Olympic level), in different sport disciplines. We investigated the prevalence of vitamin D deficiency among athletes entering the Israeli Olympic team. A total of 761 samples of Vitamin D(OH)25 from 334 athletes were analyzed. For this analysis, we used the first test the athlete had performed when joining the Olympic team. The prevalence of vitamin D deficiency (<50 nmol/L, as defined by the Endocrine Society Committee) was investigated according to gender, types of sports and outdoor vs. indoor sports through the different seasons of the Israeli Olympic team athletes. Twenty-five athletes (7.5%) were diagnosed with vitamin D deficiency. One hundred and thirty-one athletes (39.2%) had insufficient levels of vitamin D (50-75 nmol/L). The highest incidence of vitamin D deficiency was found amongst gymnastics and combat sport athletes. A significant difference was also found in vitamin D concentration between seasons. Vitamin D average concentration in the winter was 74.1 nmol/L compared to 86.4 nmol/L in the Summer (p < 0.0005). Due to the importance of vitamin D to athletic performance and the high prevalence of deficiency and insufficiency, we suggest careful and frequent monitoring of groups at risk, including elite athletes, especially in susceptible sports and during the winter. Future studies are necessary to investigate the effectiveness of Vitamin D supplementation in athletes with low baseline vitamin D levels.

The effect of a combined cooling intervention on cognitive function in the heat during an intermittent running protocol.

Despite optimal cognitive function being essential for performance, there is a lack of research on the effectiveness of combined cooling interventions on team sport athlete's cognitive function when exercising in the heat. In a randomised, crossover design, 12 unacclimatised men (age: 22.3±3.0years, body mass: 73.4±5.1kg, height: 181.0±5.3cm and max: 51.2±9.5mL/kg/min) participated in a control (CON) and combined cooling trial (ice slurry and ice collar; COOL). A battery of cognitive tests were completed prior to, during (at half-time) and following a 90-min intermittent running protocol in the heat (33°C, 50% relative humidity (RH)). Perceptual and physiological measures were taken throughout the protocol. In CON, response times were quicker on the Stroop task complex level (p=0.002) and the visual search test complex level at full-time (p=0.014) compared to COOL. During COOL, response times were quicker at half-time on the Stroop task complex level (p=0.024) compared to CON. Lower rectal temperatures were seen during COOL (CON: 37.44±0.65°C and COOL: 37.28±0.68°C) as well as lower skin, neck and forehead temperatures (main effect of trial, all p<0.05). Lower ratings of thermal sensation and perceived exertion and enhanced thermal comfort were recorded during COOL (main effect of trial, all p<0.05). Whilst minimal differences in cognitive function were found when using the combined cooling intervention, the findings highlight a practical and effective strategy to improving many physiological and perceptual responses to intermittent exercise in the heat.

The Effect of Coaches' Interpersonal Style Profiles on Young Athletes' Motivation and Sport Commitment

AbstractThe objective of this study was to identify both the latent profiles of coaching styles based on athletes' perceptions and their subsequent associations with athletes' motivation and sport commitment. The sample comprised young athletes from various sports types. Participants provided self‐reports of their perceptions of their coaches' behaviors, and their sport commitment and sport motivation. Cluster analyses revealed three coaching style profiles: Cluster 1 were coaches with a “low coaching style,” including those who lacked an autonomy‐supportive and those with a low controlling coaching style. Cluster 2 was labeled “Supportive coaching style” and represented coaches who were more apt to be autonomy‐supportive and less controlling. Cluster 3 was a “Controlling coaching style” and included coaches who demonstrated a low autonomy‐supportive and a high controlling style. Compared with athletes in Cluster 3, athletes in Clusters 1 and 2 reported higher levels of adaptive motivation and commitment variables. Thus, youth athletes perceived three clusters of coaching styles (Low coaching style, Supportive coaching style, and Controlling coaching style), and these profiles were associated with varying levels of athletes' motivation and commitment to sport.

Rehabilitation management of sports athletes’ muscle injury based on OpenSim technology

Due to the rapid development of sports and people’s love for sports, athletes often perform resistance training beyond the body to achieve better results, resulting in frequent muscle injuries. After the injury, the athlete cannot return to the state before the injury in time, which destroys the previous training results and hinders the athlete from improving to the professional level. Therefore, the research of athletes’ post-injury rehabilitation is the central subject of modern sports science research. This paper used OpenSim technology to study the rehabilitation management of sports athletes’ muscle injury. In this paper, the OpenSim skeletal muscle model was first established, followed by muscle modeling and characteristic analysis, and then a muscle rehabilitation system was constructed. The experimental part used the limb rehabilitation device model of this paper to carry out muscle rehabilitation training for patients with muscle injury, and compared it with conventional rehabilitation training. The experimental results showed that the limb rehabilitation device in this paper had a better rehabilitation effect. Compared with the traditional rehabilitation training, the excellent rate of the total active range of motion of the joints and the satisfaction of rehabilitation nursing were both increased by 10%.