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  • Gender differences in bilateral and ipsilateral lower limb strength asymmetry among football players

    Randy R. Manimtim1, Eissel Ronquillo2
    1. Office of Sports Development Program, Batangas State University The National Engineering University Lipa Campus , PH
    2. Department of Physical Education, School of Education, Holy Angel University , PH
    2026-06-02
    doi https://doi.org/10.56003/sei.v2i1.681
    Published Online: 02 June 2026
    |
    page 1-10
    Abstract

    Background: Lower limb muscle strength asymmetry is a significant factor that can impact playing ability and increase the risk of injury in soccer players. Differences in leg use and the specific movement requirements of a sport can lead to strength imbalances, either on both sides of the body or on the same side. Lower limb muscle strength asymmetry, particularly bilateral and ipsilateral strength asymmetry, is a significant factor influencing performance and increasing injury risk in football players. Differences in limb dominance and sport-specific movement demands can lead to strength imbalances.

    Objectives: This study aimed to compare bilateral and ipsilateral lower limb strength asymmetry between male and female football players.

    Methods: A cross-sectional study was conducted involving 50 amateur football players (26 males and 24 females; aged 18–21 years). Isokinetic strength testing of knee extensors and flexors was performed at 60°/s. Bilateral asymmetry was calculated based on peak torque differences between limbs, while ipsilateral asymmetry was assessed using the hamstring-to-quadriceps (H/Q) ratio. Statistical analyses included the Mann–Whitney U test and independent t-test (p < 0.05).

    Results: Significant sex differences were found in bilateral strength asymmetry for both quadriceps (7.21 ± 4.04% vs 5.04 ± 3.13%, p = 0.02) and hamstrings (9.13 ± 5.15% vs 5.06 ± 4.04%, p = 0.01), with males showing greater asymmetry. Female athletes demonstrated values closer to the recommended asymmetry threshold (≤10–15%). No significant differences were observed in ipsilateral strength asymmetry (H/Q ratio) between groups (p > 0.05).

    Conclusions: Bilateral strength asymmetry differs by sex, with male athletes exhibiting higher imbalance, while ipsilateral strength balance is comparable between groups. These findings highlight the importance of monitoring individual strength asymmetry to inform targeted training strategies, reduce injury risk, and optimize performance in football players.

    APA Citation Style
    Manimtim, R. R. , & Ronquillo, E. (2026). Gender differences in bilateral and ipsilateral lower limb strength asymmetry among football players. Sport, Exercise, and Injury, 1-10. https://doi.org/10.56003/sei.v2i1.681

  • Eccentric hamstring strength and asymmetry in female handball athletes: A descriptive study

    Alvito Dandy Putra Sanjaya1, Awang Firmansyah2, Aziz Abdul Hakim3, Panji Bana4
    1. Universitas Negeri Surabaya , ID
    2. Universitas Negeri Surabaya , ID
    3. Universitas Negeri Surabaya , ID
    4. Universitas Negeri Surabaya , ID
    2025-06-17
    doi https://doi.org/10.56003/sei.v1i1.553
    Published Online: 17 June 2025
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    page 60-69
    Abstract

    Background: Handball is a competitive sport that requires high physical strength and muscle endurance. The game requires a balance of muscle strength to support athletes in performing movements such as sprints, jumps, and fast movement maneuvers. Lack of flexibility and high hamstring muscle asymmetry values ​​are risk factors for injury to handball athletes.

    Objectives: This study aims to determine the eccentric strength and hamstring muscle asymmetry in female handball athletes in Surabaya City.

    Methods: The study subjects were 13 female handball athletes from Surabaya aged 18-23 years with regional-level competition experience and no lower extremity injuries. The instrument in this study is Nordbord by Vald Performance; Nordbord is a portable rapid assessment tool that can analyze large groups, providing information about the exact functional strength parameters quickly and efficiently. This study used a quantitative descriptive method to analyze hamstring muscle strength and asymmetry data.

    Results: Indicated the athletes had an average (body mass of 59.30 ± 10.94 kg and height of 164.80 ± 6.80 cm). The overall eccentric hamstring strength was 88.1% of the expected norm, with right and left maximum forces averaging 230.70 ± 48.80 N and 233.61 ± 50.15 N, respectively. The average asymmetry between legs was -1.44 ± 9.14%, suggesting relatively balanced muscle strength.

    Conclusions: The study concluded that hamstring eccentric strength in both legs should be improved by approximately 11.9% while maintaining the current low asymmetry levels to support muscle balance. Targeted training interventions are recommended to increase hamstring strength and minimize asymmetry, enhancing performance and reducing injury risk in female handball athletes.

    APA Citation Style
    Sanjaya, A. D. P. , Firmansyah, A. , Hakim, A. A. , & Bana, P. (2025). Eccentric hamstring strength and asymmetry in female handball athletes: A descriptive study. Sport, Exercise, and Injury, 60-69. https://doi.org/10.56003/sei.v1i1.553

  • Eccentric hamstring strength profile and limb asymmetry in sub-elite female taekwondo athletes: Implications for injury prevention

    Christina Septya Dewi1, Pudjijuniarto Pudjijuniarto2, Awang Firmansyah3, Roy Januardi Irawan4
    1. Universitas Negeri Surabaya , ID
    2. Universitas Negeri Surabaya , ID
    3. Universitas Negeri Surabaya , ID
    4. Universitas Negeri Surabaya , ID
    2025-06-17
    doi https://doi.org/10.56003/sei.v1i1.574
    Published Online: 17 June 2025
    |
    page 70-79
    Abstract

    Background: Taekwondo is a physical contact sport requiring quick reactions and explosive movements such as kicking, which depend heavily on hamstring muscle strength to maintain performance and reduce injury risk.

    Objectives: This study aims to profile the eccentric hamstring strength and asymmetry in sub-elite female taekwondo athletes in East Java.

    Methods: This was a quantitative descriptive study with a cross-sectional approach. A total of 22 female athletes with regional competition experience and no lower limb injuries were selected using purposive sampling. Data were collected using the NordBord by Vald Performance, a reliable tool for measuring eccentric hamstring strength and asymmetry. Descriptive statistics analyzed the mean, standard deviation, minimum, maximum, and strength percentage relative to normative values.

    Results: The athletes had an average age of 18.86±2.05 years, body mass of 57.45±8.90 kg, height of 160.68±6.72 cm, and BMI of24.33 ±2.51. Eccentric hamstring strength was 89.6% in the left leg, 85% in the right leg, and 87.2% overall, indicating the need for improvement.

    Conclusions: The eccentric hamstring strength of both legs needs to be increased by approximately 12.8% while maintaining the current low asymmetry level to support muscle balance. Targeted hamstring strengthening exercises are recommended to enhance performance and reduce injury risk. This study is limited to female athletes; further research should include broader populations and variables.

    APA Citation Style
    Dewi, C. S. , Pudjijuniarto, P. , Firmansyah, A. , & Irawan, R. J. (2025). Eccentric hamstring strength profile and limb asymmetry in sub-elite female taekwondo athletes: Implications for injury prevention. Sport, Exercise, and Injury, 70-79. https://doi.org/10.56003/sei.v1i1.574

  • Analysis of sports injuries in the implementation of the new 2023 regulations for the sport of Pencak Silat in the 17-35 age category

    Muhammad Miqdam Afis1
    1. State University of Malang , ID
    2026-01-05
    doi https://doi.org/10.56003/sei.v1i2.641
    Published Online: 05 January 2026
    |
    page 80-89
    Abstract

    Background: The changes to the 2022/2023 Pencak Silat competition rules established by PESILAT are aimed at international standardization, but these changes have the potential to affect patterns and injury risks for athletes in competition categories involving intense physical contact.

    Objectives: This study aims to describe the types, frequency, and body parts injured, as well as athletes' perceptions of the impact of the implementation of the new 2023 regulations on injuries among 17-35-year-old competitive Pencak Silat athletes in Malang Regency.

    Methods: The study used a quantitative descriptive design with a cross-sectional approach. The sample consisted of 30 competitive Pencak Silat athletes (aged 17–35 years) selected using purposive sampling. Data were collected in March 2025 using a questionnaire distributed online via Google Forms. Data analysis was performed descriptively using frequencies and percentages, as well as simple comparative analysis based on gender.

    Results: Of the 30 respondents, the most commonly reported injuries were sprains (22.0%) and bruises (19.5%). The body parts most frequently injured were the lower extremities (feet and ankles, 20.7%), followed by the hands (14.1%). The most dominant factors causing injury were lack of warm-up (27.5%) and collision/physical contact (26.4%). A total of 64% of athletes (n = 19) stated that the implementation of the new 2023 regulations had a significant effect on the occurrence of injuries. Severe injuries such as fractures, ACL, and MCL were only found in male athletes with a low percentage, while minor injuries (bruises and sprains) were more commonly reported in female athletes.

    Conclusions: Soft tissue injuries, particularly sprains and bruises, are the most common types of injuries experienced by competitive Pencak Silat athletes, with injuries predominantly occurring in the lower extremities.
    APA Citation Style
    Afis, M. M. (2026). Analysis of sports injuries in the implementation of the new 2023 regulations for the sport of Pencak Silat in the 17-35 age category. Sport, Exercise, and Injury, 80-89. https://doi.org/10.56003/sei.v1i2.641
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