Comparison of offensive agility techniques in Australian Rules football
- Bradshaw, Ryan, Young, Warren, Russell, Andrew, Burge, Peter
- Authors: Bradshaw, Ryan , Young, Warren , Russell, Andrew , Burge, Peter
- Date: 2011
- Type: Text , Journal article
- Relation: Journal of Science and Medicine in Sport Vol. 14, no. 1 (2011), p. 65-69
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- Description: Agility skill is important in Australian Rules football (ARF) as it enables an attacking player to successfully evade an opponent. To date, no research has examined offensive agility techniques in ARF. There were two purposes of this study: first, to compare the change of direction (COD) speed of three offensive agility techniques, and second, compare the reaction speed and accuracy when observing the same techniques from a defensive perspective. The techniques included the side-step, shuffle, and split-step. Seventeen players from an Australian Football League club were required to perform four trials of each technique. COD speed was expressed as a total time, and divided into entry, foot plant preparation, and exit time. In addition, nineteen players from the same club were assessed on a video-based reaction test. Players were required to respond by depressing a thumb switch to indicate whether the player on screen changed direction to the left or right. From an offensive perspective, the split-step foot plant preparation time (0.66. s) was significantly slower than both the side-step (0.7 s) and shuffle (0.75 s) (p< 0.05), but there were no significant differences in entry and exit times between techniques. From a defensive perspective, the players were significantly slower and less accurate when reacting to the player in the video performing the split-step (0.19. s) and shuffle (0.15. s) compared to the side-step (0.12 s) (p< 0.05). In a one-on-one situation in ARF, the split-step may be the most effective offensive technique. Not only was it slower and less accurate to react to, the exit speed following the change in direction was not significantly slower than the side-step. However, a performer would need to consider the cost of a slower foot plant preparation time versus the potential to deceive an opponent when under time stress. © 2010 Sports Medicine Australia.
The reliability of performance during computer-simulated varying gradient cycling time trials
- Clark, Bradley, Paton, Carl, O'Brien, Brendan
- Authors: Clark, Bradley , Paton, Carl , O'Brien, Brendan
- Date: 2014
- Type: Text , Journal article
- Relation: Journal of Science and Cycling Vol. 3, no. 3 (2014), p. 29-33
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- Description: Ergometer based time trials are commonly used to assess performance changes due to training or other interventions. This investigation establishes the reliability of a novel computer simulated cycling time trial. Nineteen cyclists (age: 32 ± 12 years, mass 73 ± 11 kg, height 178 ± 5 cm) completed four time trials over a 20-km course which included numerous changes in gradient. The time trials were completed over a 4-week period in order to establish both short and long-term reliability. Performance time (mean ± SD) for trials one to four was 2265 ± 149 s, 2252 ± 153 s, 2236 ± 146 s and 2240 ± 154 s respectively; the corresponding power output for consecutive trials was 293 ± 35 W, 297 ± 36 W, 299 ± 35 W and 299 ± 35 W. The coefficient of variation (± 90% confidence limits) of performance for trials separated by 7, 14, 21 and 28 days was 1.1% (0.8% – 1.5%), 1.3% (1.1% – 1.9%), 1.3% (1.1% – 1.9%) and 1.5% (1.1% – 2.1%) respectively for time; the corresponding values for power output were 2.0% (1.5% – 2.7%), 2.3% (1.8% – 3.2%), 2.6% (2.0% – 3.6%) and 3.2% (2.5% – 4.5%). Further analysis based on rider ability indicated slower riders were less reliable than faster riders by a factor of ~1.1. Reliability of time trial performance diminishes with increasing time between trials. Additionally, faster riders show better reliability than slower riders over time. Researchers should consider the effect of time between trials and athlete ability when making conclusions about intervention effectiveness.
- Authors: Clark, Bradley , Paton, Carl , O'Brien, Brendan
- Date: 2014
- Type: Text , Journal article
- Relation: Journal of Science and Cycling Vol. 3, no. 3 (2014), p. 29-33
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- Description: Ergometer based time trials are commonly used to assess performance changes due to training or other interventions. This investigation establishes the reliability of a novel computer simulated cycling time trial. Nineteen cyclists (age: 32 ± 12 years, mass 73 ± 11 kg, height 178 ± 5 cm) completed four time trials over a 20-km course which included numerous changes in gradient. The time trials were completed over a 4-week period in order to establish both short and long-term reliability. Performance time (mean ± SD) for trials one to four was 2265 ± 149 s, 2252 ± 153 s, 2236 ± 146 s and 2240 ± 154 s respectively; the corresponding power output for consecutive trials was 293 ± 35 W, 297 ± 36 W, 299 ± 35 W and 299 ± 35 W. The coefficient of variation (± 90% confidence limits) of performance for trials separated by 7, 14, 21 and 28 days was 1.1% (0.8% – 1.5%), 1.3% (1.1% – 1.9%), 1.3% (1.1% – 1.9%) and 1.5% (1.1% – 2.1%) respectively for time; the corresponding values for power output were 2.0% (1.5% – 2.7%), 2.3% (1.8% – 3.2%), 2.6% (2.0% – 3.6%) and 3.2% (2.5% – 4.5%). Further analysis based on rider ability indicated slower riders were less reliable than faster riders by a factor of ~1.1. Reliability of time trial performance diminishes with increasing time between trials. Additionally, faster riders show better reliability than slower riders over time. Researchers should consider the effect of time between trials and athlete ability when making conclusions about intervention effectiveness.
- Drew, Michael, Vlahovich, Nicole, Hughes, David, Appaneal, Renee, Peterson, Kirsten, Burke, Louise, Lundy, Bronwen, Toomey, Mary, Watts, David, Lovell, Gregory, Praet, Stephan, Halson, Shona, Colbey, Candice, Manzanero, Silvia, Welvaert, Marijke, West, Nic, Pyne, David, Waddington, Gordon
- Authors: Drew, Michael , Vlahovich, Nicole , Hughes, David , Appaneal, Renee , Peterson, Kirsten , Burke, Louise , Lundy, Bronwen , Toomey, Mary , Watts, David , Lovell, Gregory , Praet, Stephan , Halson, Shona , Colbey, Candice , Manzanero, Silvia , Welvaert, Marijke , West, Nic , Pyne, David , Waddington, Gordon
- Date: 2017
- Type: Text , Journal article
- Relation: Journal of Science and Medicine in Sport Vol. 20, no. 8 (2017), p. 745-750
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- Description: Objectives Illness can disrupt training and competition performance of athletes. Few studies have quantified the relative contribution of the known medical, behavioural and lifestyle risk factors. Design Cross-sectional. Methods Olympic athletes from 11 sports (n = 221) were invited to complete questionnaires administered nine months before the Rio 2016 Olympic Games. These included the Depression, Anxiety and Stress Questionnaire (DASS-21), Perceived Stress Scale (PSS), Dispositional Resilience Scale (DRS), Recovery-Stress Questionnaire (REST-Q-52 item), Low Energy in Females Questionnaire (LEAF-Q), a modified Personal and Household Hygiene questionnaire, Epworth Sleepiness Scale, Pittsburgh Sleep Quality Index, and custom-made questionnaires on probiotic usage and travel. An illness (case) was defined as an event which limited training or competition for greater hours in the prior month. Odds ratios and attributable fractions in the population (AFP) were utilised for categorical variables with independent t-tests or Wilcoxon rank-sum for continuous variables. Results Eighty-one athletes responded (male, n = 26; female, n = 55). There were 16 illness cases and 65 controls. Female athletes were at higher odds of illness (OR = 9.4, 95%CI 1.3–410, p = 0.01, AFP = 0.84). Low energy availability (LEAF-Q score ≥8: OR = 7.4, 95%CI 0.78–352, p = 0.04, AFP = 0.76), depression symptoms (DASS-21: depression score >4, OR = 8.4, 95%CI 1.1–59, p < 0.01; AFP = 0.39) and higher perceived stress (PSS: 10-item, p = 0.04) were significantly associated with illness. Conclusions Female sex, low energy availability, and mental health are associated with sports incapacity (time loss) due to illness. Low energy availability had high attributable fractions in the population and stands out as a primary association with illness. © 2017
Acceptability and perceptions of end-users towards an online sports-health surveillance system
- Barboza, Saulo, Bolling, Caroline, Nauta, Joske, van Mechelen, Willem, Verhagen, Evert
- Authors: Barboza, Saulo , Bolling, Caroline , Nauta, Joske , van Mechelen, Willem , Verhagen, Evert
- Date: 2017
- Type: Text , Journal article
- Relation: BMJ Open Sport and Exercise Medicine Vol. 3, no. 1 (2017), p. 1-8
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- Description: Aim To describe the acceptability and the perceptions of athletes and staff members (ie, end-users) towards an online sports-health surveillance system. Methods A pilot study with a mixed-methods approach was pursued. Descriptive analysis was conducted to present the adherence of judo (n=34), swimming (n=21) and volleyball (n=14) athletes to an online registration of their sport exposure and any health complaints between April 2014 and January 2015. End-users' perceptions towards the system were investigated qualitatively with semistructured interviews (n=21). Qualitative analysis was based on the constant comparative method using principles of the grounded theory. Results The response rates of judo, swimming and volleyball athletes were 50% (SD 23), 61% (SD 27) and 56% (SD 25), respectively. Most athletes found it simple to register their sport exposure and health complaints online; however, personal communication was still preferred for this purpose. The system facilitated the communication between medical and trainer staff, who were able to identify in the system reports health complaints from athletes that were not necessarily communicated face-to-face. Therefore, staff members reported that they were able to intervene earlier to prevent minor health complaints from becoming severe health problems. However, staff members expected higher adherence of athletes to the online follow-ups, and athletes expected to receive feedback on their inputs to the system. Conclusion An online system can be used in sporting settings complementary to regular strategies for monitoring athletes' health. However, providing feedback on athletes' inputs is important to maintain their adherence to such an online system.
- Authors: Barboza, Saulo , Bolling, Caroline , Nauta, Joske , van Mechelen, Willem , Verhagen, Evert
- Date: 2017
- Type: Text , Journal article
- Relation: BMJ Open Sport and Exercise Medicine Vol. 3, no. 1 (2017), p. 1-8
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- Description: Aim To describe the acceptability and the perceptions of athletes and staff members (ie, end-users) towards an online sports-health surveillance system. Methods A pilot study with a mixed-methods approach was pursued. Descriptive analysis was conducted to present the adherence of judo (n=34), swimming (n=21) and volleyball (n=14) athletes to an online registration of their sport exposure and any health complaints between April 2014 and January 2015. End-users' perceptions towards the system were investigated qualitatively with semistructured interviews (n=21). Qualitative analysis was based on the constant comparative method using principles of the grounded theory. Results The response rates of judo, swimming and volleyball athletes were 50% (SD 23), 61% (SD 27) and 56% (SD 25), respectively. Most athletes found it simple to register their sport exposure and health complaints online; however, personal communication was still preferred for this purpose. The system facilitated the communication between medical and trainer staff, who were able to identify in the system reports health complaints from athletes that were not necessarily communicated face-to-face. Therefore, staff members reported that they were able to intervene earlier to prevent minor health complaints from becoming severe health problems. However, staff members expected higher adherence of athletes to the online follow-ups, and athletes expected to receive feedback on their inputs to the system. Conclusion An online system can be used in sporting settings complementary to regular strategies for monitoring athletes' health. However, providing feedback on athletes' inputs is important to maintain their adherence to such an online system.
What is the definition of sports-related concussion : A systematic review
- McCrory, Paul, Feddermann-Demont, Nina, Dvorak, Jiri, Cassidy, David, McIntosh, Andrew, Vos, Pieter, Echemendia, Ruben, Meeuwisse, Willem, Tarnutzer, Alexander
- Authors: McCrory, Paul , Feddermann-Demont, Nina , Dvorak, Jiri , Cassidy, David , McIntosh, Andrew , Vos, Pieter , Echemendia, Ruben , Meeuwisse, Willem , Tarnutzer, Alexander
- Date: 2017
- Type: Text , Journal article , Review
- Relation: British Journal of Sports Medicine Vol. 51, no. 11 (2017), p. 877-887
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- Description: Objectives: Various definitions for concussion have been proposed, each having its strengths and weaknesses. We reviewed and compared current definitions and identified criteria necessary for an operational definition of sports-related concussion (SRC) in preparation of the 5th Concussion Consensus Conference (Berlin, Germany). We also assessed the role of biomechanical studies in informing an operational definition of SRC. Design: This is a systematic literature review. Data sources: Data sources include MEDLINE, Embase, Cumulative Index to Nursing and Allied Health Literature, Cochrane Central Register of Clinical Trials and SPORT Discus (accessed 14 September 2016). Eligibility criteria for selecting studies: Eligibility criteria were studies reporting (clinical) criteria for diagnosing SRC and studies containing SRC impact data. Results: Out of 1601 articles screened, 36 studies were included (2.2%), 14 reported on criteria for SRC definitions and 22 on biomechanical aspects of concussions. Six different operational definitions focusing on clinical findings and their dynamics were identified. Biomechanical studies were obtained almost exclusively on American football players. Angular and linear head accelerations linked to clinically confirmed concussions demonstrated considerable individual variation. Summary/conclusions: SRC is a traumatic brain injury that is defined as a complex pathophysiological process affecting the brain, induced by biomechanical forces with several common features that help define its nature. Limitations identified include that the current criteria for diagnosing SRC are clinically oriented and that there is no gold/standard to assess their diagnostic properties. A future, more valid definition of SRC would better identify concussed players by demonstrating high predictive positive/negative values. Currently, the use of helmet-based systems to study the biomechanics of SRC is limited to few collision sports. New approaches need to be developed to provide objective markers for SRC. © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved.
- Authors: McCrory, Paul , Feddermann-Demont, Nina , Dvorak, Jiri , Cassidy, David , McIntosh, Andrew , Vos, Pieter , Echemendia, Ruben , Meeuwisse, Willem , Tarnutzer, Alexander
- Date: 2017
- Type: Text , Journal article , Review
- Relation: British Journal of Sports Medicine Vol. 51, no. 11 (2017), p. 877-887
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- Description: Objectives: Various definitions for concussion have been proposed, each having its strengths and weaknesses. We reviewed and compared current definitions and identified criteria necessary for an operational definition of sports-related concussion (SRC) in preparation of the 5th Concussion Consensus Conference (Berlin, Germany). We also assessed the role of biomechanical studies in informing an operational definition of SRC. Design: This is a systematic literature review. Data sources: Data sources include MEDLINE, Embase, Cumulative Index to Nursing and Allied Health Literature, Cochrane Central Register of Clinical Trials and SPORT Discus (accessed 14 September 2016). Eligibility criteria for selecting studies: Eligibility criteria were studies reporting (clinical) criteria for diagnosing SRC and studies containing SRC impact data. Results: Out of 1601 articles screened, 36 studies were included (2.2%), 14 reported on criteria for SRC definitions and 22 on biomechanical aspects of concussions. Six different operational definitions focusing on clinical findings and their dynamics were identified. Biomechanical studies were obtained almost exclusively on American football players. Angular and linear head accelerations linked to clinically confirmed concussions demonstrated considerable individual variation. Summary/conclusions: SRC is a traumatic brain injury that is defined as a complex pathophysiological process affecting the brain, induced by biomechanical forces with several common features that help define its nature. Limitations identified include that the current criteria for diagnosing SRC are clinically oriented and that there is no gold/standard to assess their diagnostic properties. A future, more valid definition of SRC would better identify concussed players by demonstrating high predictive positive/negative values. Currently, the use of helmet-based systems to study the biomechanics of SRC is limited to few collision sports. New approaches need to be developed to provide objective markers for SRC. © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved.
- Trease, Larissa, Wilkie, Kellie, Lovell, Greg, Drew, Michael, Hooper, Ivan
- Authors: Trease, Larissa , Wilkie, Kellie , Lovell, Greg , Drew, Michael , Hooper, Ivan
- Date: 2020
- Type: Text , Journal article
- Relation: British Journal of Sports Medicine Vol. 54, no. 21 (2020), p. 1288-1293
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- Description: Aim To report the epidemiology of injury and illness in elite rowers over eight seasons (two Olympiads). Methods All athletes selected to the Australian Rowing Team between 2009 and 2016 were monitored prospectively under surveillance for injury and illness. The incidence and burden of injury and illness were calculated per 1000 athlete days (ADs). The body area, mechanism and type of all injuries were recorded and followed until the resumption of full training. We used interrupted time series analyses to examine the association between fixed and dynamic ergometer testing on rowers' injury rates. Time lost from illness was also recorded. Results All 153 rowers selected over eight seasons were observed for 48 611 AD. 270 injuries occurred with an incidence of 4.1-6.4 injuries per 1000 AD. Training days lost totalled 4522 (9.2% AD). The most frequent area injured was the lumbar region (84 cases, 1.7% AD) but the greatest burden was from chest wall injuries (64 cases, 2.6% AD.) Overuse injuries (n=224, 83%) were more frequent than acute injuries (n=42, 15%). The most common activity at the time of injury was on-water rowing training (n=191, 68). Female rowers were at 1.4 times the relative risk of chest wall injuries than male rowers; they had half the relative risk of lumbar injuries of male rowers. The implementation of a dynamic ergometers testing policy (Concept II on sliders) was positively associated with a lower incidence and burden of low back injury compared with fixed ergometers (Concept II). Illness accounted for the greatest number of case presentations (128, 32.2% cases, 1.2% AD). Conclusions Chest wall and lumbar injuries caused training time loss. Policy decisions regarding ergometer testing modality were associated with lumbar injury rates. As in many sports, illness burden has been under-recognised in elite Australian rowers. ©
Forced retirement transition : a narrative case study of an elite Australian Rules football player
- Demetriou, Andreas, Jago, Andrew, Gill, Peter, Mesagno, Christopher, Ali, Lutfiye
- Authors: Demetriou, Andreas , Jago, Andrew , Gill, Peter , Mesagno, Christopher , Ali, Lutfiye
- Date: 2020
- Type: Text , Journal article
- Relation: International Journal of Sport and Exercise Psychology Vol. 18, no. 3 (2020), p. 321-335
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- Description: Retirement from elite sport is a complex and often-problematic process. The current study explores a negative case study of an athlete recently retired from a team sport (Australian Rules Football) in order to generate knowledge on how to improve the retirement process. Three semi-structured interviews were undertaken less than 5 years post retirement, and archival career records were gathered from online sources. Data were coded to construct a narrative account of the participant’s career and retirement. Narrative analysis also revealed that the retirement transition from elite sports for this athlete was problematic and caused considerable personal distress. We suggest that the means of improving retirement transition and reducing harm to players include fostering alternative life narratives and increasing self-complexity, utilising norm appropriate communication strategies, and recognising retirement as a potential grieving period for loss of community. © 2018, © 2018 International Society of Sport Psychology.
- Authors: Demetriou, Andreas , Jago, Andrew , Gill, Peter , Mesagno, Christopher , Ali, Lutfiye
- Date: 2020
- Type: Text , Journal article
- Relation: International Journal of Sport and Exercise Psychology Vol. 18, no. 3 (2020), p. 321-335
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- Description: Retirement from elite sport is a complex and often-problematic process. The current study explores a negative case study of an athlete recently retired from a team sport (Australian Rules Football) in order to generate knowledge on how to improve the retirement process. Three semi-structured interviews were undertaken less than 5 years post retirement, and archival career records were gathered from online sources. Data were coded to construct a narrative account of the participant’s career and retirement. Narrative analysis also revealed that the retirement transition from elite sports for this athlete was problematic and caused considerable personal distress. We suggest that the means of improving retirement transition and reducing harm to players include fostering alternative life narratives and increasing self-complexity, utilising norm appropriate communication strategies, and recognising retirement as a potential grieving period for loss of community. © 2018, © 2018 International Society of Sport Psychology.
- Harris, Rachel, Trease, Larissa, Wilkie, Kellie, Drew, Michael
- Authors: Harris, Rachel , Trease, Larissa , Wilkie, Kellie , Drew, Michael
- Date: 2020
- Type: Text , Journal article
- Relation: British Journal of Sports Medicine Vol. 54, no. 16 (2020), p. 991-996
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- Description: Aim To describe the demographics, frequency, location, imaging modality and clinician-identified factors of rib stress injury in a cohort of elite rowers over the Rio Olympiad (2012-2016). Methods Analysis of prospectively recorded medical records for the Australian Rowing Team in 2013-2015 and the combined Australian Rowing Team and Olympic Shadow Squad in 2016, examining all rib stress injuries. Results 19 rib stress injuries (12 reactions and 7 fractures) were identified among a cohort of 151 athletes and included 12 female and 7 male cases, 11 open weight, 8 lightweight, 12 scull and 7 sweep cases. The most common locations of injury identified by imaging, were the mid-axillary line and rib 6. Period prevalence varied from 4 to 15.4 and incidence ranged from 0.27 to 0.13 per 1000 athlete days. There were no significant differences in prevalence by sex, sweep versus scull or weight class. There was a statistically significant increase in incidence in the pre-Olympic year (2015, p<0.001). MRI was the most commonly used modality for diagnosis. Stress fracture resulted in median 69 (IQR 56-157) and bone stress reaction resulted in 57 (IQR 45-78) days lost to full on water training. Conclusions In our 4-year report of rib stress injury in elite rowing athletes, period prevalence was consistent with previous reports and time lost (median
Infographic consensus recommendations on the classification, definition and diagnostic criteria of hip-related pain in young and middle-aged active adults from the International Hip-related Pain Research Network, Zurich 2018
- Reiman, Michael, Agricola, Rintje, Kemp, Joanne, Heerey, Joshua, Weir, Adam, Van Klij, Pim, Kassarjian, Ara, Mosler, Andrea, Ageberg, Eva, Hölmich, Perj, WArholm, Kristian, Griffin, Damian, Mayes, Suec, Khan, Karim, Crossley, Kay, Bizzini, Mario, Bloom, Nancy, Casartelli, Nicola, Diamond, Laura, Di Stasi, Stephanieu, Drew, Michael, Friedman, Daniel, Freke, Matthew, Glyn-Jones, Sionz, Gojanovic, Borisaa, Harris-Hayes, Marcie, Hunt, Michael, Impellizzeri, Franco, Ishøi, Lasseae;, Jones, Denise
- Authors: Reiman, Michael , Agricola, Rintje , Kemp, Joanne , Heerey, Joshua , Weir, Adam , Van Klij, Pim , Kassarjian, Ara , Mosler, Andrea , Ageberg, Eva , Hölmich, Perj , WArholm, Kristian , Griffin, Damian , Mayes, Suec , Khan, Karim , Crossley, Kay , Bizzini, Mario , Bloom, Nancy , Casartelli, Nicola , Diamond, Laura , Di Stasi, Stephanieu , Drew, Michael , Friedman, Daniel , Freke, Matthew , Glyn-Jones, Sionz , Gojanovic, Borisaa , Harris-Hayes, Marcie , Hunt, Michael , Impellizzeri, Franco , Ishøi, Lasseae; , Jones, Denise
- Date: 2021
- Type: Text , Journal article , Review
- Relation: British Journal of Sports Medicine Vol. 55, no. 2 (2021), p. 115-117
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- Description: **Please note that there are multiple authors for this article therefore only the name of the first 30 including Federation University Australia affiliate “Michael Drew" is provided in this record**
- Authors: Reiman, Michael , Agricola, Rintje , Kemp, Joanne , Heerey, Joshua , Weir, Adam , Van Klij, Pim , Kassarjian, Ara , Mosler, Andrea , Ageberg, Eva , Hölmich, Perj , WArholm, Kristian , Griffin, Damian , Mayes, Suec , Khan, Karim , Crossley, Kay , Bizzini, Mario , Bloom, Nancy , Casartelli, Nicola , Diamond, Laura , Di Stasi, Stephanieu , Drew, Michael , Friedman, Daniel , Freke, Matthew , Glyn-Jones, Sionz , Gojanovic, Borisaa , Harris-Hayes, Marcie , Hunt, Michael , Impellizzeri, Franco , Ishøi, Lasseae; , Jones, Denise
- Date: 2021
- Type: Text , Journal article , Review
- Relation: British Journal of Sports Medicine Vol. 55, no. 2 (2021), p. 115-117
- Full Text:
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- Description: **Please note that there are multiple authors for this article therefore only the name of the first 30 including Federation University Australia affiliate “Michael Drew" is provided in this record**
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