Roar Amundsen

• Thorarinsdottir, Solveig; Amundsen, Roar; Larmo, Arne Feilberg; Pedersen, Roar; Andersen, Thor Einar & Bahr, Roald [Show all 7 contributors for this article] (2024). Groin injuries in women's premier league football in Norway: A two-season prospective cohort study describing clinical and imaging characteristics. Scandinavian Journal of Medicine & Science in Sports. ISSN 0905-7188. 34(4). doi: 10.1111/sms.14611.
• Amundsen, Roar; Thorarinsdottir, Solveig; Larmo, A.; Pedersen, R.; Andersen, Thor Einar & Møller, Merete [Show all 7 contributors for this article] (2024). #ReadyToplay: hamstring injuries in women’s football–a two-season prospective cohort study in the Norwegian women’s premier league. Science and medicine in football. ISSN 2473-3938. doi: 10.1080/24733938.2024.2305389.
• Amundsen, Roar; Thorarinsdottir, Solveig; Clarsen, Benjamin Matthew; Andersen, Thor Einar; Møller, Merete & Bahr, Roald (2023). #ReadyToPlay: health problems in women's football-a two-season prospective cohort study in the Norwegian premier league. British Journal of Sports Medicine. ISSN 0306-3674. 58(1), p. 4–11. doi: 10.1136/bjsports-2023-107141. Show summary

  Objectives: To describe the prevalence, incidence and burden of all health problems in the Norwegian women’s premier league. Methods: During the 2020 and 2021 seasons, players in the Norwegian women’s premier league reported all health problems (sudden-onset injuries, gradual-onset injuries and illnesses) weekly, using the Oslo Sports Trauma Research Centre Questionnaire on Health Problems. Team medical staff diagnosed reported problems using the Sport Medicine Diagnostic Coding System. We calculated average weekly prevalence, incidence and burden of all health problems reported. Results: We included 294 players (age: 22±4 years) from 11 teams. Response rate to the weekly questionnaire was 79%. On average, 32% (95% CI: 31% to 33%) of the players reported at least one health problem at any time and 22% (95% CI: 21% to 23%) reported a substantial health problem negatively affecting their training volume or performance. The overall incidence was 10.7 health problems per 1000 hours of football exposure. Sudden-onset injuries were most severe (68% of the total time loss), followed by gradual-onset injuries (25%) and illnesses (8%). Thigh was the most common injury location (26%), while knee injuries were most severe, causing 42% of the total injury time loss. Anterior cruciate ligament (ACL) injuries alone caused 30% of the total injury time loss. Conclusion: One in five players had a health problem negatively affecting their training volume or performance at any time. Sudden-onset injuries represented the most burdensome health problem. Thigh injuries were most frequent, while knee injuries, ACL injuries especially, were most severe.

• Amundsen, Roar; Møller, Merete & Bahr, Roald (2023). Performing Nordic hamstring strength testing with additional weight affects the maximal eccentric force measured: do not compare apples to oranges. BMJ Open sport & exercise medicine. ISSN 2055-7647. 9(4). doi: 10.1136/bmjsem-2023-001699. Full text in Research Archive Show summary

  Background: Nordic hamstring test devices are commonly used to measure maximal eccentric hamstring force. The ability to control the final phase of the exercise has been adopted as a criterion to add weight when testing, without substantial evidence. We investigated if adding weight affected the maximal force measured, and if there were differences between players who could and could not control the final phase. Methods: Female (n=84) and male (n=56) football players performed a Nordic hamstring strength test with 0, 5 and 10 kg. We used visual inspection to assess the ability to control the final phase (approximately last 20°), as per previously published studies. Results: Maximal force was higher when tested with 5 kg (females: +8 N (2%), p<0.001; males: +18 N (4%), p<0.001) and 10 kg (females: +17 N (5%), p<0.001; males: +27 N (6%), p<0.001) compared with 0 kg. This was the case for both groups, those who could control the final phase (5 kg: +16 N (4%), p<0.001; 10 kg: +28 N (7%), p<0.001) and those who could not (5 kg: +9 N (3%), p<0.001; 10 kg: +15 N (4%), p<0.001). Conclusion: Both players who could and could not control the final phase of the Nordic hamstring test demonstrated higher maximal force when adding weight to testing. Therefore, this should not be used to decide if players should perform testing with or without weight. Either all participants or none should be tested with weight, and the same approach should be used both for pre-testing and post-testing.

• Støvland, Varg Ringdal; Amundsen, Roar; Paulsen, Gøran & Dalen-Lorentsen, Torstein (2023). Prepare to fail or failing to prepare? Acute performance after the 11+ with and without strength exercises. BMJ Open sport & exercise medicine. ISSN 2055-7647. 9(4). doi: 10.1136/bmjsem-2023-001634. Full text in Research Archive
• Amundsen, Roar; Thorarinsdottir, Solveig; Larmo, Arne; Pedersen, R.; Andersen, Thor Einar & Møller, Merete [Show all 7 contributors for this article] (2023). Hamstring injuries in the Norwegian women's Premier League. In Della Villa, F & Susta, D (Ed.), Football Medicine - The Pursuit of Excellence - Abstract book. Calzetti Maricci editori. ISSN 9788860286871. p. 210–211.
• Amundsen, Roar; Sæther Heimland, Janita; Thorarinsdottir, Solveig; Møller, Merete & Bahr, Roald (2022). Effects of High and Low Training Volume with the Nordic Hamstring Exercise on Hamstring Strength, Jump Height, and Sprint Performance in Female Football Players: A Randomised Trial. Translational Sports Medicine (TSM). ISSN 2573-8488. 2022. doi: 10.1155/2022/7133928. Full text in Research Archive Show summary

  The evidence-based hamstring strengthening programme for prevention of hamstring injuries is not adopted by football teams because of its high training volume. This study on female football players investigated if high-volume training with the Nordic hamstring exercise is more effective on hamstring strength, jump height, and sprint performance than low-volume training. We also examined the time course of changes in muscle strength during the intervention period. Forty-five female football players were randomised to a high- (21 sessions, 538 total reps) or low-volume group (10 sessions, 144 total reps) and performed an 8-week training intervention with the Nordic hamstring exercise during the preseason. We tested hamstring strength (maximal eccentric force with NordBord and maximal eccentric torque with isokinetic dynamometer), jump height, and 40 m sprint before and after the intervention. The NordBord test was also performed during training weeks 4 and 6. Both groups increased maximal eccentric force (high-volume: 29 N (10%), 95% CI: 19–38 N, , low-volume: 37 N (13%), 95% CI: 18–55 N, ), but there were no between-group differences (). Maximal eccentric torque, jump height, and sprint performance did not change. Maximal eccentric force increased from the pretest to week 6 (20 N (7%), 95% CI: 8 to 31 N, ), but not week 4 (8 N (3%), 95% CI: −2 to 18 N, ). High training volume with the Nordic hamstrings exercise did not lead to greater adaptations in strength, jump height, or speed than a low-volume programme. Players in both groups had to train for at least 6 weeks to improve maximal eccentric force significantly.

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• Kåshagen, Ingvild & Amundsen, Roar (2024). “ReadyToPlay” project in women’s football.
• Thorarinsdottir, Solveig; Amundsen, Roar; Larmo, Arne Feilberg; Pedersen, Roar; Andersen, Thor Einar & Bahr, Roald [Show all 7 contributors for this article] (2023). Groin injuries in womens premier league football in Norway.
• Thorarinsdottir, Solveig; Amundsen, Roar; Clarsen, Benjamin Matthew; Andersen, Thor Einar; Møller, Merete & Bahr, Roald (2023). #ReadyToPlay. Health problems in womens premier leage football.
• Amundsen, Roar; Thorarinsdottir, Solveig; Larmo, Arne; Pedersen, R.; Andersen, Thor Einar & Møller, Merete [Show all 7 contributors for this article] (2023). Hamstring injuries in the Norwegian women's Premier League.
• Thorarinsdottir, Solveig; Amundsen, Roar; Bahr, Roald; Andersen, Thor Einar; Larmo, Arne & Pedersen, R. [Show all 7 contributors for this article] (2023). Groin injuries in women's Premier League football in Norway. In Della Villa, F & Susta, D (Ed.), Football Medicine - The Pursuit of Excellence - Abstract book. Calzetti Maricci editori. ISSN 9788860286871.
• Thorarinsdottir, Solveig; Amundsen, Roar; Bahr, Roald; Andersen, Thor Einar; Larmo, Arne & Pedersen, R. [Show all 7 contributors for this article] (2023). Groin injuries in women's Premier League football in Norway.
• Jan, Løken & Amundsen, Roar (2023). Klinisk workshop - Hamstring.
• Amundsen, Roar (2023). AthleteMonitoring - verktøyet for å samle data. Praktisk gjennomgang.
• Amundsen, Roar (2023). Hva vet vi om skader i Toppserien fra #ReadyToPlay?
• Thorarinsdottir, Solveig; Amundsen, Roar; Clarsen, Benjamin Matthew; Andersen, Thor Einar; Møller, Merete & Bahr, Roald (2022). INJURIES AND ILLNESS IN ELITE WOMEN’S FOTBALL IN NORWAY – A TWO-YEAR PROSPECTIVE COHORT STUDY .
• Amundsen, Roar; Thorarinsdottir, Solveig & Vagle, Markus (2022). Idrettsforskning podcast - ReadyToPlay: skader og helseplager i kvinnefotballen. [Radio]. Podcast.
• Amundsen, Roar (2022). Hamstringsskader i Toppserien.
• Amundsen, Roar & Thorarinsdottir, Solveig (2022). #ReadyToPlay - helseproblemer i Toppserien.
• Amundsen, Roar & Thorarinsdottir, Solveig (2022). #ReadyToPlay - helseproblemer i Toppserien.
• Amundsen, Roar (2022). Hamstringskader i norsk elite kvinnefotball, helt ferske data .
• Amundsen, Roar; Thorarinsdottir, Solveig; Clarsen, Benjamin Matthew; Andersen, Thor Einar; Møller, Merete & Bahr, Roald (2022). Health problems in the elite women`s football league in Norway - a prospective cohort study.
• Amundsen, Roar; Thorarinsdottir, Solveig; Pedersen, Roar; Larmo, Arne; Andersen, Thor Einar & Møller, Merete [Show all 7 contributors for this article] (2022). Hamstringsskader i elite kvinnefotball.
• Amundsen, Roar (2022). Hamstring injuries in female elite football.
• Thorarinsdottir, Solveig; Amundsen, Roar & Vagle, Markus (2022). #ReadyToPlay, the case of women's elite football.
• Thorarinsdottir, Solveig & Amundsen, Roar (2021). Spillertilgjengelighet i Toppserien.
• Amundsen, Roar (2021). Mars vs Venus, how injury prevention strategies for women’s football embrace the differences.
• Amundsen, Roar (2021). Difference between high and low training volumes of Nordic hamstring?
• Amundsen, Roar (2020). ReadyToPlay: Injury and illness surveillance in the Norwegian female elite football league.
• Thorarinsdottir, Solveig; Amundsen, Roar & Vagle, Markus (2020). Frokostseminar om forebygging av skader i kvinnelig toppfotball.
• Amundsen, Roar (2020). Hamstringsskader i fotball.
• Bahr, Roald; Amundsen, Roar & Sæther Heimland, Janita (2021). Effekten av høg og låg dosering av Nordic hamstrings trening på eksentrisk knefleksjonsstyrke - ei randomisert kontrollert studie. Norges idrettshøgskole.
• Bahr, Roald; Amundsen, Roar & Helle, Knut Magnus Bauge (2021). Uke-til-uke reliabilitet for målinger av eksentrisk hamstringsstyrke og isometriskisometriskisometrisk isometrisk adduksjons -, abduksjons, innadrotasjons-, utadrotasjons- og fleksjonsstyrke i hoften blant kvinnelige Toppseriespillere i fotball – en metodestudie. Norges idrettshøgskole.

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