Australian Rules Research Articles

Headpulse Biometric Measures Following Concussion in Young Adult Athletes

Concussions are common in sports. Return-to-play protocols can be enhanced by objective biometrics. To characterize temporal changes of headpulse, a digital biometric, in athletes with sports-related concussion; to explore the association of unstructured physical activity with headpulse changes. This cohort study included headpulse measurements from players in the highest level of amateur Australian Rules Football in South Australia. Analysis included feasibility and validation phases, with the feasibility cohort recruited between August 5, 2021, and September 10, 2021, and the validation cohort recruited between May 5, 2022, and September 3, 2022. Data were analyzed October 2022 through January 2023. Cranial accelerometry detected micromovements of the head following cardiac contraction (what we have described as "headpulse"). Headpulse was serially recorded for 1 month in concussed individuals. Headpulse waveforms underwent frequency transformation analysis per prespecified algorithm. Result Z scores were calculated. Headpulse Z scores exceeding 2 (2 SDs from control means) met an abnormality threshold. Headpulse sensitivity, timing, and duration of change were determined. A total of 59 control and 43 concussed individuals (44 total concussions; 1 control also concussed, 1 concussed individual injured twice) provided headpulse measurements. The feasibility cohort (all male) included 17 control (median [IQR] age, 23 [19-28] years) and 15 concussed individuals (median [IQR] age, 21 [19-23] years). The validation cohort included 25 female (median [IQR] age, 21 [20-22] years) and 17 male (median [IQR] age, 26 [23-29] years) control individuals, and 8 female (median [IQR] age, 28 [20-31] years) and 20 male (median [IQR] age, 21 [19-23] years) concussed individuals. Headpulse reached abnormality threshold in 26 of 32 concussed individuals (81%; 9% on day 0, 50% by day 2, 90% by day 14). Headpulse alterations lasted 14 days longer than symptoms and were exacerbated by return-to-play or unsupervised physical activity. In this study of 101 amateur Australian Rules Football athletes, the digital headpulse biometric was evaluated in 44 sports-related concussions. Compared with controls, new headpulse changes occurred after concussion; this objective metric may complement return-to-play protocols.

Betting on Australian Rules Football: Can Expert Tipsters beat Randomness?

Betting on the various codes of football in Australia accounts for the majority of sports betting, with Australian rules football (AFL) by far the most popular sport in Australia. Several studies have revealed the heavy presence of gambling advertising during AFL broadcasts, and a frequently used advertising strategy involves the use of well-known AFL commentators outlining their tips and betting suggestions. To date, no research has examined the hypotheses that skill may help in predicting AFL matches and monetary outcomes from AFL betting. Rather than merely discounting such ideas, it is important to test them empirically. The aims of this study were therefore, to examine if (1) expert AFL tipsters made better predictions than random picks, (2) expert AFL tipsters gained greater monetary reward than random selection, and (3) expert tipsters’ prediction accuracy improved with betting experience. To this end, six seasons of AFL matches, odds data, and expert tipster data were analysed retrospectively, totalling 1141 matches. Random selections were calculated for each match using an inbuilt random number generator within Microsoft Excel and a $2 simulated wager was applied for each AFL match. The results of mixed-effects modelling showed that experts picked more correct outcomes than random selection; experts’ correct predictions were partially mediated by home-game selections; no difference in monetary outcome was observed for experts compared to random selection; experts’ predictions did not improve over time. The results of this study may be used to inform both psychological interventions that target gamblers’ illusions of control, and public health gambling harm prevention messaging.

Surgical treatment of high-grade acute intramuscular hamstring tendon injuries in athletes leads to predictable return to sports and no re-injuries.

The purpose of this study was to assess the post-operative return to sport and re-injury rates following surgical repair of acute, first-time, high-grade intramuscular hamstring tendon injuries in high level athletes. Patients were identified using the databases of two sports surgeons. Once patients were identified their clinical notes and imaging were reviewed to confirm that all patients had injuries to the intramuscular portion of the distal aspect of the proximal biceps femoris tendon. All imaging was reviewed by an experienced musculoskeletal radiologist to confirm diagnosis. Surgery for such injuries was indicated in high-level athletes presenting with acute hamstring injuries. All patients were operated on within 4weeks. Outcomes included Tegner scores, return to sport, Lower Extremity Functional Score (LEFS), current hamstring symptoms and complications including re-injury. Eleven injuries (10 patients) were included in the study. All patients were male and Australian Rules Football players. Six patients were professional athletes and 4 semi-professional athletes. Median age was 24.5 (range 21-29) and median follow-up period was 33.7months (range; 16-65). 91% were British Athletic Muscle Injury Classification (BAMIC) 3c and 9% were BAMIC 4c. 91% were classed as MR2 and 9% as MR3 on the simplified four-grade injury classification. Athletes achieved return to play (RTP) at an average of 3.1months (SD 1.0) post repair. All but one patient achieved a Tegner score equal to pre-injury levels. Maximum LEFS was achieved by all patients. Minor pain scores (all with VAS < 1/10) on sciatic and functional stretch were recorded in 36% and 27% of patients respectively, with subtle neural symptoms (9%) and subjective tightness (36%) also noted. There were no surgical complications in our patient cohort. No patients had a re-injury or re-operation. Surgical repair of high-grade intramuscular tendon injuries of the biceps femoris hamstring muscle in athletes resulted in high levels of return to pre-injury sporting levels and no re-injuries. The intra-muscular tendon should be scrutinized when assessing hamstring injuries in elite sport and offer surgery in high-grade cases. IV.

Chronic traumatic encephalopathy in a female ex-professional Australian rules footballer.

Chronic traumatic encephalopathy in a female ex-professional Australian rules footballer.

Merging Athletic Development With Skill Acquisition: Developing Agility Using an Ecological Dynamics Approach

ABSTRACT Agility has commonly been regarded as a physical quality, and strength and conditioning practitioners have typically used a closed environment approach for developing agility. This closed environment approach involves the decoupling of perception and action, where actions are trained in isolation from perception. Previous studies have shown, however, that when perception or action is trained in isolation, behavior changes. Therefore, agility is complex and multifactorial in nature. Through ecological dynamics, specifically the principle of representative learning design, practitioners should design training tasks that align more closely with the demands of competition. Representative learning design ensures that perception and action remain coupled to promote greater transfer of performance from training to competition. Another key principle for agility task design is coadaptation, and this can be operationalized through manipulation of opposing players. With these 2 key principles, we offer examples of agility tasks in 3 team invasion sports including soccer, rugby union, and Australian rules football.

The Impact of Family History In Anterior Cruciate Ligament Injuries in Professional Australian Rules Footballer Players

The Impact of Family History In Anterior Cruciate Ligament Injuries in Professional Australian Rules Footballer Players

“An Occupational Hazard”: Former Elite Male Professional Players’ Experiences of On-Field Violence in Australian Football (1970 to 1995)

This oral history research explores the experience of ten retired elite Australian football players during their careers in the period from 1970 to 1995. The ex-players were interviewed about their careers by sports journalist, Mike Sheahan, in the long-running Australia Fox Sports Open Mike television series. The particular focus of this historical research is ex-players’ experience of on-field violence. Findings indicated that ex-players were willing to break the Australian football rules and engage in on-field violence either as intimidation or retaliation against opponents. When ex-players did engage in violent intimidatory behavior, they were cool and callous, and anger rarely played a role. Violent retaliation to opposition player transgressions was either immediate or delayed until a future opportunity presented itself. For one Indigenous ex-player, violent responses during games were often sparked by opponents’ verbal racial abuse. In retrospect, he considered this a form of intimidation aimed at putting him off his game that was just part of Australian football at the time. Some ex-players did feel remorse about their violent acts, but others were adamant that they had no regrets about their behavior. Violence was almost expected as an everyday aspect of their football experience and was accepted as an occupational hazard.

Measuring alcohol consumption while watching sport events: a feasibility and validity study comparing ecological momentary assessments and transdermal alcohol monitors

ABSTRACT Background This feasibility and validity study aimed to evaluate and compare ecological momentary assessment (EMA) surveys and transdermal SCRAM-CAM monitors to measure drinking while watching Australian Rules Football (AFL). Methods During 29 events, 13 participants wore a SCRAM-CAM monitor while completing EMA surveys. Correspondence in the alcohol levels detected and correlation between the self-reported drinks and transdermal alcohol concentration (TAC) were measured. An exit survey assessed participant experiences. Results Alcohol consumption was self-reported on 24 (83.3%) of 29 events, with an average of 5.0 standard drinks consumed over 2.3 hours. Correspondence in the levels of alcohol detected was good at 0.62. TAC curves showed large-sized correlations to the number of self-reported drinks (r = 0.55–0.67). Some participants noted discomfort from the SCRAM-CAM, whilst others reported annoyance completing EMA surveys during a match. Conclusions EMA surveys are a cost effective method for collecting information on drinking as well as contexts and other factors such as harms. A clear benefit of the SCRAM-CAM is the ability to provide detailed information on intoxication trajectories. We suggest that a combination of the two methods will inform the most meaningful approaches for prevention and intervention strategies to reduce harmful drinking among sport spectators.

Understanding mental toughness at a Women’s Australian rules football club

Scholars have argued that mental toughness is a term that represents hypermasculine ideals. This hypermasculinity ideal could be considered relevant in the sport of Australian rules football, which has been played, at the professional level, by male athletes for the majority of its existence. Given the rising popularity of the Australian Football League Women’s (AFLW), the present research sought to explore how the term mental toughness was understood at an AFLW club through a cultural sport psychology lens. Interviews were conducted with players (n = 4) and coaches (n = 6) from an AFLW club over the course of a competitive season. Data were transcribed verbatim and thematically analysed, with themes constructed to correspond with different levels of contextual influence. From this analysis, the club values and underlying assumptions, the social truths, and the role models/archetypes that provided a collective understanding of the term were identified. Mental toughness was defined by high-performance values of the men’s game, which had implications for female athletes in this environment who are not afforded the same opportunities to fully embody these values. Mental toughness is positioned, in this environment, as an ideal with different meanings for female athletes due to structural factors associated with elite-level competition (e.g., full-time versus part-time professionalism).

Including a Technical Factor with Physical and In-Game Movement Factors Improves Model Sensitivity When Evaluating Draft Outcome in Elite-Junior Australian Rules Football

Determining characteristics that define talent is critical for recruitment and player development. When developing predictive models, sensitivity is important, as it describes the ability of models to identify players with draft potential (true positives). In the current literature, modelling is limited to a small number of selected variables, and model sensitivity is often poor or unreported. The aim of this study was to determine how a technical factor combined with physical and in-game movement factors affects position-specific model sensitivity when evaluating draft outcome in an elite-junior National Australia Bank (NAB) League population. Physical, in-game movement, and technical involvement data were collated from draft-eligible (18th year) participants in the under 18 boys NAB League competition (n = 465). Factors identified through parallel analysis were used in binomial regression analyses. Models using factor combinations were developed to predict draft success for all-position, nomadic, fixed-position, and fixed&ruck players. Models that best characterised draft success were all-position (physical and technical: specificity = 97.2%, sensitivity = 36.6%, and accuracy = 86.3%), nomadic (physical and technical: specificity = 95.5%, sensitivity = 40.7%, and accuracy = 85.5%), fixed (physical: specificity = 96.4%, sensitivity = 41.7%, and accuracy = 86.6%), and fixed&ruck (physical and in-game movement: specificity = 96.3%, sensitivity = 41.2%, and accuracy = 86.7%). Including a technical factor improved sensitivity in the all-position and nomadic models. Physical factors and physical and in-game movement yielded the best models for fixed-position and fixed&ruck players, respectively. Models with improved sensitivity should be sought to assist practitioners to more confidently identify the players with draft potential.

An evaluation of a mental health literacy program for community sport leaders

Community sports coaches and leaders can have an important role to play as informal resources for sporting adolescents and adults at risk of mental ill-health. Supporting coach mental health literacy using programs has potential to enhance opportunities for coach-player support. This study aimed to evaluate a community sport mental health literacy program and its capacity to improve club leader confidence to support and refer (primary outcome), awareness of resources, beliefs about mental health and stigmatizing attitudes (social distance). A cluster-randomized controlled evaluation was conducted with measures taken at baseline (around 2 weeks prior to intervention), immediately post-program and at a nine-month follow up. Twenty-five community Australian Rules Football clubs from metropolitan and regional centres were sampled and matched by size and location. Coaches or sport leaders (n = 265) were randomized by club to either the intervention group or a waitlist control group. A multivariate analysis of variance (pre-test scores as covariates) revealed participants in the ‘Tackle Your Feelings’ (TYF) program reported improved outcomes compared to controls on measures tied to leader confidence to support and refer, knowledge of resources to support mental health, general help-seeking and stigmatizing attitudes tied to social distance. A fifth measure of beliefs about mental illness was not impacted by the program. A nine-month comparison group follow-up indicated some decay in scores over time. The results suggest that TYF programs can be effective at improving coach mental health literacy in community sporting club contexts.

Comparative Effects of Contrast Training and Progressive Resistance Training on Strength and Power-Related Measures in Subelite Australian Rules Football Players.

Schneiker, KT, Fyfe, JJ, Teo, SYM, and Bishop, DJ. Comparative effects of contrast training and progressive resistance training on strength and power-related measures in subelite Australian Rules Football players. J Strength Cond Res 37(7): 1440-1448, 2023-The aim of this study was to determine whether contrast training (CST) elicits superior strength-related and power-related outcomes compared with progressive resistance training (PRT). Sixteen male amateur Australian Rules Football players (age, 19 ± 2 years; height, 183 ± 8 cm; body mass, 78.5 ± 8.8 kg; mean ± SD ) completed 2 weeks of standardized resistance training followed by 6 weeks of either CST or PRT. Both CST and PRT improved absolute (20 and 19%) and relative (19 and 16%) 1 repetition maximum (1RM) half squat strength, absolute (8.7 and 8.7%, respectively) and relative (8.2 and 6.1%, respectively) squat jump peak power, and 20-m sprint performance (5.4 and 4.7%, respectively), including both 0 to 5 m (15 and 14%, respectively) and 0 to 10 m (8.6 and 7.5%, respectively) splits. Vertical jump height only improved with CST (6.5%), whereas body mass only increased after PRT (1.9%). There were negative associations between the baseline power-to-strength ratio (PSR) and improvements in both absolute ( r2 = 0.51 and 0.72 for CST and PRT, respectively) and relative ( r2 = 0.65 and 0.60 for CST and PRT, respectively) squat jump peak power. There were no statistically significant (i.e., p ≥ 0.05) between-group differences for all training outcomes. Both interventions improved various strength-related and power-related measures, although a lower baseline PSR was associated with greater improvements in power-related outcomes after both interventions. Contrast training is therefore an effective alternative to progressive resistance training during relatively short-term (6-8 weeks) training periods in young, male, team-sport athletes, particularly in those with a lower power-to-strength ratio.

Position-Specific Running and Technical Demands During Male Elite-Junior and Elite-Senior Australian Rules Football Match-Play.

Jennings, J, Štaka, Z, Wundersitz, DW, Sullivan, CJ, Cousins, SD, Čustović, E, and Kingsley, MI. Position-specific running and technical demands during male elite-junior and elite-senior Australian rules football match-play. J Strength Cond Res 37(7): 1449-1455, 2023-The aim of this study was to compare position-specific running and technical demands of elite-junior and elite-senior Australian rules football match-play to better inform practice and assist transition between the levels. Global positioning system and technical involvement data were collated from 12 Victorian U18 male NAB League ( n = 553) and 18 Australian Football League ( n = 702) teams competing in their respective 2019 seasons. Players were grouped by position as nomadic, fixed, or ruck, and data subsets were used for specific analyses. Relative total distance ( p = 0.635, trivial effect), high-speed running (HSR) distance ( p = 0.433, trivial effect), acceleration efforts ( p = 0.830, trivial effect), deceleration efforts ( p = 0.983, trivial effect), and efforts at >150 m·min -1 ( p = 0.229, trivial effect) and >200 m·min -1 ( p = 0.962, trivial effect) did not differ between elite-junior and elite-senior match-play. Elite juniors covered less total and HSR distance during peak periods (5 seconds-10 minutes) of demand ( p ≤ 0.022, small-moderate effects). Within both leagues, nomadic players had the greatest running demands followed by fixed position and then rucks. Relative disposals ( p = 0.330, trivial effect) and possessions ( p = 0.084, trivial effect) were comparable between the leagues. During peak periods (10 seconds to 2 minutes), elite juniors had less technical involvements than elite seniors ( p ≤ 0.001, small effects). Although relative running demands and positional differences were comparable between the leagues, elite juniors perform less running, HSR, and technical involvements during peak periods when compared with elite seniors. Therefore, coaching staff in elite-senior clubs should maintain intensity while progressively increasing the volume of training that recently drafted players undertake when they have transitioned from elite-junior leagues.

Reliability of the running vertical jump test in female team sport athletes

Injury rates to the lower limb have increased over the past 40 years, coinciding with increases in female sport participation rates. Sport specific tests such as the running vertical jump (RVJ) are utilised for injury risk profiling, however the test-retest reliability is unknown. ObjectivesThe aim of this study was to investigate the test-retest reliability of the thorax, pelvis and lower limb joint angular kinematics and kinetics for the RVJ test in female team sport athletes. DesignThree-dimensional motion capture with force plate integration was utilised as participants performed five trials on each limb on three separate days. SettingTesting occurred in a biomechanics laboratory. ParticipantsThirty-four females (Australian Rules Football = 15, Netball = 12, Soccer = 7) participated in this study. Main Outcome MeasuresIntraclass correlation coefficients (ICC), effect sizes and typical errors (TE) of segment and joint angular kinematics and kinetics were calculated. ResultsPoor to excellent reliability (ICC = −0.12 – 0.92), small to large effect sizes (0.00–0.90) and TE (0.02–289.24) were observed across segment and joint angular kinematics and kinetics. ConclusionsThe RVJ test is recommended when analysing ground reaction forces and joint angular kinematics in female team sport athletes.

Modelling Australian Rules Football as spatial systems with pairwise comparisons

Abstract Statistical analysis in competitive sport is an important tool for developing strategy and seeking competitive advantages. However, for complex team sports such as Australian Rules Football, major limitations occur when using possession event data for game analysis. First, focusing on counting possession events does not capture the impact of off-the-ball actions such as ground positioning of other players. Second, it is difficult to determine the extent that an event is due to either team’s relative proficiency or skill. Third, there is limited possession event data available from each match and modelling efforts often have low statistical power. Here we reinterpret event data into positional systems and utilise pairwise performance metrics to understand the relative team proficiency in each of these states. These metrics can then be used to construct transition probabilities between states for future games, and ultimately, absorbing probabilities of goal states. Our approach effectively predicts match outcomes using team ratings for forward, midfield and defensive systems and is sufficiently interpretable to support strategic decision-making by coaching departments in the Australian Football League (AFL).

O067 The role of biological sex in the relationship between circadian alignment and well-being in elite athletes

Abstract Introduction Circadian rhythms govern physiological timing and influence sleep, well-being, and performance. Desynchrony between circadian timing and behaviours (circadian misalignment) can compromise daily functioning. We investigated sex differences in sleep and circadian timing, and their relationship with sleep and mental health outcomes in elite athletes. Methods Participants were 87 elite Australian Rules Football (AFL) athletes (43% female; M-age =23.8±4.0 years). Data were collected prior to the start of the 2021 and 2022 AFL seasons (n= 54 participating in a repeat assessment). Circadian phase was assessed via salivary DLMO (collected hourly from 5hrs pre- to 1h post-habitual bedtime). A questionnaire battery, and two weeks of actigraphy were also completed. Results Female athletes had a significantly later circadian phase (DLMO; 20:42 vs 20:13) and midsleep time (03:24 vs 02:58), and worse self-reported athlete psychological strain (APSQ), daytime sleepiness, and insomnia, relative to male athletes. There was no sex difference in phase angle (interval between sleep onset and DLMO times; M = 2.5hrs ± 49 mins). DLMO time did not predict sleep efficiency, sleep latency, insomnia, sleepiness, or APSQ. Phase angle predicted APSQ for female athletes only, via a quadratic trend (p=.001): psychological strain was worse among female athletes with shorter and longer phase angles. Discussion Our results suggest female athletes have a later circadian phase, which is not associated with adverse outcomes except for higher psychological strain for those with greater circadian misalignment. Sports practitioners may require specific attention for circadian alignment in female athletes who are at particular risk when misaligned.

Competitive Situations Requiring Mental Toughness in Women’s Australian Rules Football

ABSTRACT In the last decade, mental toughness (MT) researchers have been interested in the behaviours exemplifying MT. Despite this interest, little attention has been paid to the competitive situations these behaviours occur in. Hence, the aim of the current study was to start addressing this gap by comprehensively focusing on the situations requiring MT in sport – specifically, the contextual demands linked to MT in women’s Australian rules football. Focus groups and individual semi-structured interviews were conducted at two Australian rules football clubs after each competitive round of the 2020 season. Following analysis of participant responses, three broad situational categories were created, representing the psychological demands required by the player or team to successfully overcome in-game challenges. These categories were: context intelligence, attentional regulation, and emotional regulation. This study identified that situations requiring MT also required a degree of acceptance and commitment – alluding to a potential link between acceptance-commitment therapy (ACT) and MT. Conceptually, this view offers a new perspective on the psychological process of being mentally tough in competition. The link between ACT and MT also offers an avenue for MT development. Recommendations are made for incorporating these identified situations into regular training sessions following affective learning design principles.

IMPLEMENTATION OF CONNECTED AUTONOMOUS VEHICLES ON ROAD NETWORKS: ALIGNED INFRASTRUCTURE LEGISLATION

Strategies for implementing connected autonomous-vehicles, require focusing on respective road-infrastructure impact and, incorporation into future transport-planning. To this end, an analysis was conducted of (semi-structured interviews with 9) experts from road/traffic-engineering and public-works-departments (PWDs), charged to trial local initiatives. Legislation being introduced or amended in North America and Europe towards best-practice applications sought to determine the particular national strategies by those currently implementing the use of AVs. Analysis in Australia determined that there are 716 legislative barriers currently blocking the legal use of AVs. In particular, this study of respective uptake barriers found obstacles of legal significance directly relevant to civil engineering practitioners; namely, Australian Road Rules 126 and 127 which prohibit connected autonomous vehicles from platooning – reducing the spacing between vehicles. Overseas, a recognition of platooning is inherent; the benefits of platooning include fuel savings, reduced greenhouse gas emissions, and labor savings for freight vehicles. This research determined that the isolated-north of Western Australia (WA) is a suitable place to begin innovative legislation reviews towards platooning due to the current prevalence of, and applicability to, heavy vehicles in the local mining industry. This research project developed a guidance tool for practitioners and stakeholders to implement successful platooning. The flowchart guidance tool here provides the first step for Main-Roads-PWD to adopt (the benefits of AV) platooning for connected autonomous vehicles across selected WA road networks and presents guidance for application more widely for general autonomous vehicle uptake.

Epidemiology of quadriceps muscle strain injuries in elite Australian rules football players.

INTRODUCTION: Quadriceps muscle strain injuries are prevalent in the Australian Football League (AFL) with each team recording 1-2 new quadriceps strain injuries per season. Little is known about the epidemiology and recovery time frames for quadriceps muscle strain injuries especially when compared to other common muscle injuries in football. This study aimed to describe the epidemiology of quadriceps muscle strain injuries in AFL players. We also aimed to describe recovery milestones and to investigate the influence of clinical factors such as injury type (index or re injury), the primary muscle injured, and the mechanism of injury on recovery timeframes.

Upper limb performance and neuromuscular asymmetries in Australian Rules Footballers following shoulder stabilisation surgery

Introduction: Shoulder dislocations are prevalent in Australian Rules Football (ARF) with many requiring shoulder stabilisation surgery. Following surgery, most athletes desire to return to sport (RTS) at their pre-injury level of performance. However, residual inter-limb deficits in strength and neuromuscular performance may delay RTS, and contribute to poor outcomes. The aim of this study was to investigate inter-limb deficits at the time of clearance to RTS during long-lever isometric tests in patients after stabilisation surgery, compared to an uninjured control group of ARF players.