Journal of Sports Medicine and Physical Fitness最新文献

Background: Match running performance is crucial for evaluating physical demands in elite soccer, with potential differences across age categories. Understanding these differences is essential for optimizing the physical preparation and career progression of young players. This study aimed to compare match running performance among senior, under-20 (U20), and under-17 (U17) elite soccer teams.

Methods: Data were collected from FIFA World Cup 2022, U20 World Cup, and U17 World Cup 2023 from the FIFA website. Running performance was assessed at both the team level and the individual level. Key performance variables included total distance covered (TD), distance across five running zones, sprints (SPR), high-speed runs (HSR), and maximum sprinting speed (MSS). Linear mixed model was used to compare performance across the three age groups.

Results: No significant differences between senior and U20 teams in most variables (all P>0.05) were observed, except for walking distance, which favored the senior teams in both team and individual performance (P<0.05). U20 teams covered greater distances in jogging and moderate speed running (MSR) (team performance), and jogging distance (individual performance) compared to senior teams (P<0.05). Senior and U20 teams generally outperformed U17 teams in most variables (P<0.05), except for walking distance, where U17 teams performed higher than U20 teams (P<0.001), with no significant differences between U17 and senior teams (P>0.05) for individual performance. Additionally, U17 teams showed similar performance to senior teams in jogging distance (team performance) (P>0.05).

Conclusions: Senior and U20 teams consistently outperformed U17 teams in most variables, except for walking distance. These findings provide valuable insights into the physical demands of match play across age groups.

Background: This study examines sports-related concussions (SRC) experiences, beliefs, and behaviors among male and female teenage grassroots soccer players in the UK, focusing on how these are shaped by interpersonal and mediated relations with coaches, parents, and peers.

Methods: A cross-sectional cohort study informed by interpretivist epistemology and qualitative research design. Data collection involved focus groups, using a topic guide covering SRC knowledge, attitudes, behaviors, and reporting intentions. Focus group sessions were conducted between July 2023 and April 2024. Participants were enrolled through convenience and snowball sampling at a single grassroots soccer club in the UK. Three cohorts of male participants (N.=15) and one cohort of female participants (N.=5) participated in three focus groups each. The 12 focus groups were held at the grassroots soccer academy with the club welfare officer present. Sessions were digitally recorded, transcribed, and analyZed using a framework analysis model.

Results: Participants identified and recognized many symptoms associated with SRC, though knowledge was mainly acquired through informal channels (e.g., the media). However, this understanding did not lead to safety-related behavior changes, with significant non-compliance observed among players, parents, and coaches.

Conclusions: Effective SRC management requires tailored education programs to overcome barriers and promote safety within grassroots youth soccer. Addressing gender norms and enhancing education can foster a culture of support and accountability, safeguarding the well-being of young athletes. There is a need for better awareness and more precautionary behaviors among all stakeholders in grassroots soccer.

Background: Soccer is the most practiced sport globally, and adequate dietary intake can significantly impact athletic performance. This study aimed to assess the nutritional knowledge of semi-professional and professional Italian soccer players and evaluate whether their dietary intake aligns with international recommendation for elite soccer players.

Methods: Male players from two Italian football league teams (one in Category C, one in Category D) participated during the regular season. Demographic and anthropometric data were collected during the initial visit. Nutrition knowledge was evaluated using a simplified version of the "Nutrition for Sport Knowledge Questionnaire" (NSKQ). Participants completed a 4-day food diary and dietary data were compared against dietary references for elite athletes and soccer players.

Results: Twenty-five soccer players (11 from a Category C team and 14 from a Category D team) participated in the study. Total energy intake was consistently below recommendations but increased on match days. Category C players consumed more protein and fat but fewer carbohydrates than Category D players, with significant differences on specific days (P<0.05). The Category D team showed greater adherence to macronutrient intake guidelines: protein (60.7% vs. 38.6%, P=0.023), fat (58.9% vs. 15.9%, P<0.0001), and carbohydrates (23.2% vs. 9.1%, P=0.053). NSKQ scores indicated poor nutritional knowledge in both teams, with no significant correlation between NSKQ scores and dietary adherence.

Conclusions: The dietary composition of the Category D team more closely aligned with reference guidelines compared to the Category C team. This discrepancy might reflect differences in dietary habits or nutritional misconceptions.

Background: Physical exercise is known to modulate arterial stiffness. However, this modulation can vary according to the type of exercise or training. This study aims to compare levels of arterial stiffness among healthy young men practicing different exercise modalities, including resistance training (RT), high-intensity cross-training (HICT), and running (RUN), and comparing these results with a control group.

Methods: Eighty healthy young men were divided into three exercise groups according to the type of exercise they practiced (RT, N.=20; HICT, N.=20; RUN, N.=20), plus a sedentary control group (CON, N.=20). In this observational study, participants were evaluated for arterial stiffness with carotid-femoral Pulse Wave Velocity (c-f PWV, m/s) and pulse wave analyses (Augmentation Index [Aix] and Augmentation Index normalized to a heart rate of 75 bpm [AIx@75bpm]). Participants were also assessed for cardiorespiratory fitness (VO2max, mL/kg/min) by means of maximal graded exercise testing.

Results: Despite the absence of statistical significance (P>0.05), the CON group showed less favorable arterial stiffness indices (AIx: 1.85±2.99; AIx@75bpm: -7.41±3.00) compared to all exercise groups ([RT AIx: -5.68±2.29; AIx@75bpm: -13.98±2.41]; [HICT AIx: -1.36±2.20; AIx@75bpm: -10.26±2.16]; [RUN AIx: -2.29±3.09; AIx@75bpm: -7.14±3.09]). The RUN group showed significantly higher VO2max than the other groups (RUN vs. CON, P<0.001; RUN vs. RT, P<0.001; and RUN vs. HICT, P<0.001).

Conclusions: The findings suggest that arterial stiffness does not differ according to different exercise modalities practiced by healthy young men.

Background: Health-related fitness (HRF) is essential for wellbeing and daily functioning. While objective fitness assessments are preferred, self-report measures are practical for large-scale or geographically diverse studies. Existing self-report HRF measures may lack sensitivity for younger or healthy adults. Additionally, many include items with no or poorly defined reference populations, potentially limiting their validity and comparability. This study examined the reliability and validity of single-item self-reported HRF measures of aerobic fitness, muscular strength and endurance, flexibility, coordination, agility, and body composition.

Methods: Between April and July 2023, University of Calgary students and staff (N.=129; mean age 28±9 years) completed the first questionnaire, with subsets completing a second questionnaire and validated fitness assessment. Nine items captured participants' self-rated HRF relative to those of the same age and gender. The nine self-reported HRF items were aggregated to obtain an estimate of overall HRF (Multidimensional Health-Related Fitness Scale, MHFS). We used intraclass correlations (ICC) to estimate test-retest reliability of the individual self-reported HRF items and MHFS. We assessed convergent validity with self-reported leisure physical activity (LPA) and concurrent validity with objective fitness measures using age- and sex-adjusted partial correlations.

Results: The single-item self-reported HRF measures (ICC=0.60-0.85) and MHFS (ICC=0.87) had acceptable test-retest reliability. The MHFS also had high internal consistency (Cronbach's α=0.87). Evidence of validity was observed with partial correlations ≥0.30 between self-reported HRF and LPA, and objective fitness measures.

Conclusions: The MHFS provides a reliable and valid HRF indicator among younger adult populations.

Background: This study aimed to investigate the relationships between well-being, recovery state, game loads, and game performance across 20 official games involving 16 highly trained collegiate basketball players. Understanding how these factors interact is essential for optimizing performance and workload management in competitive basketball.

Methods: Principal component analysis (PCA) identified six key components contributing to performance: PC1 (loads) accounted for 50% of the total variance, PC2 (well-being) explained 11%, PC3 (jump) captured 8%, PC4 (high-intensity jump) explained 6%, while PC5 (recovery) and PC6 (PlayerLoad per minute) each explained 2%. Generalized linear mixed-effects models were applied to assess the associations between these components and key performance indicators, including Performance Index Rating (PIR) and Player Total Contribution (PTC).

Results: Game loads showed a negative association with PIR (β=-1.22, 95% CI=-2.33 to -0.12, P<0.05). In contrast, high-intensity jumps were positively associated with both PIR (β=1.08, 95% CI=0.39 to 1.77, P<0.01) and PTC (β=0.99, 95% CI=0.34 to 1.64, P<0.01), explaining 43.86% of the variance in PIR and 40.17% in PTC. The effects of well-being and recovery were limited.

Conclusions: High-intensity physical activities, particularly jumps, are crucial to enhancing basketball performance, while excessive game loads can negatively impact outcomes. The limited influence of well-being and recovery suggests that their effects may be more evident over longer periods or under different contexts. Future research should focus on optimizing the balance between game loads and high-intensity actions to improve performance.

Introduction: This systematic review with meta-analysis aimed to compare the effects of traditional exercise (using low-load resistance training (LLRT) with and without blood flow restriction (BFR)) on functional outcomes, pain levels, muscle strength, and range of motion (ROM) in patients with upper extremity disorders. The primary distinction between the experimental and control interventions lies in the application of blood flow restriction during the exercise protocol.

Evidence acquisition: Searches have been performed in the PubMed, Web of Science, Embase and Cochrane databases, together with the reference lists of randomized controlled trials (RCTs) up to March 2025. The participants in the RCTs were individuals with orthopedic abnormalities of the upper extremity arising from surgical intervention, trauma, or degenerative disorders, and the intervention was LLRT-BFR, as opposed to LLRT alone. The major focus was on assessing upper limb function and pain, with secondary considerations including muscle strength and ROM. The quality and reporting standards of the studies were evaluated via the TESTEX scale. The Grading of Recommendations Assessment, Development, and Evaluation (GRADE) was conducted to verify the quality of evidence. The means and standard deviations (SDs) of the pre- and post-intervention data were extracted from each study. The means and SDs of the change scores were calculated, and these values were imported into Review Manager software (The Nordic Cochrane Collaboration) to compute the standardized mean difference (SMD) as the effect size.

Evidence synthesis: A systematic search across the aforementioned four databases initially identified 466 potentially relevant articles. Through a rigorous screening process, five articles that met the predefined inclusion criteria were ultimately selected for further analysis. These studies included 85 patients who underwent LLRT-BFR and 85 patients who received only LLRT. In patients with upper extremity dysfunction, the meta-analysis revealed significantly superior outcomes with LLRT-BFR compared with LLRT without BFR across multiple measures: pain reduction (SMD, 1.19; P=0.0002 [95% CI, 0.56-1.81]), functional improvement (SMD, 1.32; P=0.005 [95% CI, 0.39-2.24]), grip strength enhancement (SMD, 0.64; P=0.004 [95% CI, 0.20-1.07]), and radial flexion improvement (SMD, 0.81; P=0.003 [95% CI, 0.28--1.34]).

Conclusions: BFR combined with LLRT produced better outcomes than LLRT alone in terms of function, discomfort, grip strength, and wrist range of motion (ulnar deviation). For people with upper limb deficits, BFR combined with LLRT may have some potential as a complementary intervention, and further research is needed to establish its efficacy and safety, particularly in different patient populations.

Background: Physical activity (PA) has a direct influence on body composition, particularly in terms of lean body mass (LBM) and fat mass (FM). This study assesses how lifelong changes in PA impact body mass index (BMI) and body composition using data from NHANES (1999-2006) for adults aged 29 to 59 years.

Methods: Data were extracted from the National Health and Nutrition Examination Survey (1999-2006), including male and female participants aged 29-59. The cross-sectional analysis focused on the relationship between BMI and the fat mass index (FMI)/Lean Body Mass Index (LBMI) ratio, adjusted for height (ht). Multivariate linear regression models were adjusted for covariates and stratified by sex. All analyses were adjusted considering the sample weights.

Results: The analysis comprised 5115 participants, with 51.7% male and an average age of 42.8±0.13 years. The FMI/ht-LBMI ratio is approximately 0.4 for men and 0.7 for women. The results indicated that women had a mean BMI increase (β=1.9, 95% CI: 1.4-2.4) for every 0.1 increase in the FMI/ht-LBMI ratio, while men had a mean BMI increase (β=1.0, 95% CI: 0.7-1.4) (P<0.05), compared to those maintaining the same PA pattern over ten years. Additionally, factors such as socioeconomic status, race/ethnicity, and nutritional status at age 25 were found to significantly impact body composition outcomes.

Conclusions: In summary, long-term PA emerges as a modifier in population-level body composition. Individuals with a history of lower PA over the last decade showed a higher proportion of adipose tissue. In this way, the importance of maintaining substantial levels of PA throughout life is emphasized, contributing positively to body composition.

Background: Football injuries pose substantial risks to player health, team performance, and club finances. Although injury prevention is a key priority, most epidemiological studies focus on short-term data from international tournaments or clubs outside Germany. This study aimed to examine the injury epidemiology in German elite men's football through a long-term analysis of a single club competing in both top national leagues.

Methods: A professional German football team was prospectively observed over eight consecutive seasons, with four seasons played in the first division and four in the second. Injury incidence and associated time loss were analyzed using Poisson regression.

Results: A total of 357 match injuries and 625 training injuries were recorded. Injury incidence did not significantly differ between the first and second division, either for match play (79.0 vs. 80.8 injuries per 1000 match hours, P=0.83) or training (8.7 vs. 9.2 injuries per 1000 training hours, P=0.49). However, average time loss was significantly greater in the first division for both training injuries (70 vs. 49 days per 1000 training hours, P<0.01) and match injuries (653 vs. 596 days per 1000 match hours, P=0.017).

Conclusions: Although injury incidence was comparable between the two top German divisions, injuries sustained in the first division led to significantly greater time loss. These findings highlight the importance of addressing not only the frequency but also the severity of injuries in elite football injury prevention strategies.

Background: Adductor-related groin pain syndrome (ARGPS) is a common overuse injury encountered in sports requiring quick accelerations and decelerations, changes of direction and kicking. If conservative treatment fails, ARGPS can be surgically treated with adductor longus tenotomy (ALT). Four types of ALT are described in literature: two are different types of partial tenotomy (PT1 and PT2) and two are two different types of total tenotomy (TT1 and TT2). The aim of this study was to compare these four different types of ALT in athletic populations affected by ARGPS.

Methods: In this retrospective study (level of evidence IV), four study groups of soccer players at different athletic levels were considered. G1 grouped 12 male patients subjected to partial ALT (PT1), G2 included 13 male patients subjected to partial ALT with a surgical technique (PT2) different to that employed in G1, G3 grouped 10 male patients subjected to total ALT (TT1) and G4 included 10 male patients subjected to total ALT with a different surgical technique (TT2) to G3.

Results: The percentage of subjects who resumed sporting activities and the return to play (RTP) times were respectively 83% and 7.5±3.8 months, 100% and 4.0±0.4 months, 100% and 3.1±0.5 months, 100% and 2.4±0.4 months for the study groups G1, G2, G3 and G4. The percentage of subjects that returned to sport was significantly lower (P<0.05) in G1 while the time for RTP was significantly lower (P<0.05) in G4.

Conclusions: Of all the surgical techniques employed in ALT, the TT2 surgical technique entails a lower complication rate and allows for the quickest RTP in athletic populations.