The purposes were to evaluate kinetics in lower limbs using single leg countermovement jump (SLCMJ) and to identify the differences in SLCMJ kinetics between sprinting fast players and sprinting slow players in elite university female soccer players. Seventeen participants at the national tournament level completed the survey. SLCMJ and 30 m sprinting tests were performed. A force-plate was used to collect the data of the SLCMJ test. Significant differences of concentric maximum rate of force development (RFD), concentric RFD, concentric RFD/body weight (BW), peak net takeoff force/BW, peak power, and peak power/BW existed between both legs during the SLCMJ among all the participants. For further analysis, the participants were divided into fast group and slow group based on sprinting performance. Significant differences existed between the two groups in concentric peak velocity (nondominant, p = 0.028) and vertical velocity at takeoff (nondominant, p = 0.021). Concentric maximum RFD (p = 0.036) was significantly different between both legs in the slow group. Among elite university female soccer players, the players who presented more increased asymmetry of kinetic characteristics of jumping, also showed weak sprinting performance. Moreover, the players presented the best performance in velocity of the jumping variables and also had the best sprinting performance. Coaches and players should focus on keeping inter-limb balance and developing jumping velocity to improve sports performance. In future, the cause-and-effect relationship between jumping and sprinting should be identified.

Body pain, often considered as an early sign of injury in young players, warrants thorough study. This study aimed to examine the distribution of badminton-related pain and prevalence in pre-adolescent and adolescent badminton players. Profiles of badminton-related pain were surveyed using a questionnaire among 366 pre-adolescent and adolescent badminton players aged 7–12 years. The distribution of badminton-related pain was described, and the pain incidence was calculated. Proportions of pain per 1000-training-hour exposures were the main outcome measures. The analysis considered various age groups (7–8, 9–10, and 11–12 years) and years of badminton experience (≤2, 2–3, and > 3 years). In total, 554 cases of badminton-related pain were reported. The ankle was the most common site, followed by knee, plantar, shoulder, and lower back. The overall pain rate per 1000-training-hour exposure was 3.06. The 11–12-year-old group showed the highest pain rate, significantly greater than the 7–8-year-old group and the 9–10-year-old group. Additionally, the prevalence of pain exhibited an increasing trend with age. Finally, regardless of the age groups, participants with 2–3 years of badminton experience had the highest pain rate. These findings might help inform targeted interventions to reduce the high prevalence of pain in various body regions across pre-adolescent and adolescent badminton players.

This study aims to investigate the prevalence of locomotive syndrome (LS) and to examine the relationship of LS with musculoskeletal symptoms (pain, generalized joint laxity (GJL)) in young Chinese adults. Our study population (n = 157; mean age of 19.8 ± 1.2 years) comprises college student residents at Tsinghua University in Beijing, China. Three screening methods were used to evaluate LS: 25-question Geriatric Locomotive Function Scale (GLFS-25), a two-step test, and a stand-up test. Musculoskeletal pain was assessed by self-report and visual analog scale (VAS), and joint body laxity was evaluated using the GJL test. The prevalence of LS was 21.7% of all participants. Musculoskeletal pain affected 77.8% of the college students with LS and was strongly associated with LS. A total of 55.0% of college students with LS had four or more site joints that were positive for GJL, and higher scores of GJL were associated with a higher prevalence rate of LS. Young Chinese college students have a relatively high prevalence of LS, and musculoskeletal pain and GJL were significantly related to LS. The present results suggest that we need early screening of musculoskeletal symptoms and LS health education in young adults to prevent the mobility limitations of LS in the future.

This study aimed to compare the anthropometric and physical characteristics of elite 15-, 16-, and 17-year-old male soccer players by playing position. We recruited 238 players under 17 years of age from Chinese professional soccer clubs. The measurements included body height and mass, body girth and length, and body composition. The countermovement jump (CMJ), T-test, and Yo-Yo intermittent recovery test level 1 (YYIR1) were used to assess physical ability. The results revealed that the U16 and U17 players had significantly greater body mass (p < 0.05), body height (p < 0.05), muscle mass (p < 0.05), lower limb length (p < 0.05), and chest girth (p < 0.05) than did the U15 players. Significant differences in calf girth (p < 0.001), thigh girth (p < 0.05), and Achilles tendon length (p < 0.05) were observed between the U17 group and U15 group. Additionally, the U16 group and U17 group both scored significantly better than the U15 group on the 5-m sprinting test, 20-m sprinting test, 30-m sprinting test (p < 0.001), single left jump test with arm swing (p < 0.001), single right jump test with arm swing (p < 0.001), T-test (p < 0.001), CMJ test (p < 0.001), and YYIR test (p < 0.001). Furthermore, U17 players performed significantly better on the CMJ test (p < 0.001) and YYIR test (p < 0.001) than U16 players did. This study revealed significant differences in body height, body mass, muscle mass, chest girth, lower limb length, ankle circumference, calf length, Achilles tendon length, 20-m speed, 30-m speed, and YYIR test results among the six playing position groups. Goalkeepers and central defenders had significantly greater body heights than players at other playing positions. Goalkeepers scored significantly lower on the YYIR test than players in other positions did. These findings revealed the anthropometric and physical characteristics of elite 15-17-year-old male soccer players in China, helping soccer coaches better understand the anthropometric and physical characteristics across ages and playing positions when selecting youth soccer players and optimizing soccer training programs. Moreover, youth soccer players can gain insights into their own strengths and weaknesses, enabling them to develop training for personal improvement.

Wearing a mask can help prevent respiratory diseases. However, it remains challenging to simultaneously keep the face warm and humid while ensuring sufficient oxygen intake. Forced convective airflow during respiration reduces the heat exchange efficiency of current wearable masks, especially in cold environments. Here, we present MetaMask, a heterogeneous-structure mask that employs a synergistic strategy combining asymmetric radiation control with condensation-evaporation. MetaMask recovers 82.1 ± 0.7% of heat and 94.1 ± 1.1% of moisture from exhaled air to warm and humidify the inhaled air. In a − 20 °C environment, it raises the inhaled air temperature to 26.2 °C while maintaining adequate oxygen intake. MetaMask also provides anti-frost and UV protection. This design offers an effective solution for facial protection in extremely cold conditions.

To develop a prevention program for rowing-related injuries, it is crucial to study the epidemiological characteristics of injuries among Chinese rowing athletes. This study aimed to investigate the distribution and incidence of injuries among Chinese rowing athletes aged 12–24 years. A retrospective study was conducted in 2024 among 207 rowing athletes in China using a rowing-specific questionnaire. The questionnaire comprised two sections: the first section collected basic information, including gender, age, height, weight, years of training experience, daily training hours, weekly training days, and weekly training hours; the second section collected information on rowing-related injuries over the past year, including injury locations, mechanisms, and severity. An injury was defined as a physical complaint with time loss and/or medical care. Rowing-related injuries were normalized to rates per 1000 training hours and per 1000 training sessions, calculated using the Poisson distribution based on age and gender. A total of 131 injuries were reported, including 51 (38.9%) acute-onset and 80 gradual-onset (61.1%) injuries. The lower back was the most common site (39.7%, 52 cases), followed by the knee and shoulder. Over two-thirds of the injuries caused less than a week’s absence from rowing. The overall injury rate per 1000 training hours was 0.46 (95% CI: 0.38–0.54), and the overall injury rate per 1000 training sessions was 2.16 (95% CI: 1.79–2.53). Rowing-related injuries were significantly associated with gender (OR: 3.52, 95% CI: 1.37–9.02, p = 0.009) and BMI (OR: 3.63, 95% CI: 1.33–9.95, p = 0.012). Among Chinese rowing athletes, injuries frequently occurred, especially in female athletes. Lower back injuries were the most common, followed by knee and shoulder injuries. This study contributes to improving injury prevention and early detection in high-risk anatomical regions and vulnerable athletes among elite rowers.