203 research outputs found
sj-pdf-1-ajs-10.1177_03635465211038332 – Supplemental material for Effects of Pubertal Maturation on ACL Forces During a Landing Task in Females
No full textSupplemental material, sj-pdf-1-ajs-10.1177_03635465211038332 for Effects of Pubertal Maturation on ACL Forces During a Landing Task in Females by Azadeh Nasseri, David G. Lloyd, Clare Minahan, Timothy A. Sayer, Kade Paterson, Christopher J. Vertullo, Adam L. Bryant and David J. Saxby in The American Journal of Sports Medicine</p
The Validity of Automated Tackle Detection in Women's Rugby League
No full textCummins, C, Charlton, G, Naughton, M, Jones, B, Minahan, C, and Murphy, A. The validity of automated tackle detection in women's rugby league. J Strength Cond Res XX(X): 000-000, 2020 -- This study assessed the validity of microtechnology devices to automatically detect and differentiate tackles in elite women's rugby league match-play. Elite female players (n = 17) wore a microtechnology device (OptimEye S5 device; Catapult Group International) during a representative match, which involved a total of 512 tackles of which 365 were defensive and 147 were attacking. Tackles automatically detected by Catapult's tackle detection algorithm and video-coded tackles were time synchronized. True positive, false negative and false positive events were utilized to calculate sensitivity (i.e., when a tackle occurred, did the algorithm correctly detect this event) and precision (i.e., when the algorithm reported a tackle, was this a true event based on video-coding). Of the 512 video-derived attacking and defensive tackle events, the algorithm was able to detect 389 tackles. The algorithm also produced 81 false positives and 123 false negatives. As such when a tackle occurred, the algorithm correctly identified 76.0% of these events. When the algorithm reported that a tackle occurred, this was an actual event in 82.8% of circumstances. Across all players, the algorithm was more sensitive to the detection of an attacking event (sensitivity: 78.2%) as opposed to a defensive event (sensitivity: 75.1%). The sensitivity and precision of the algorithm was higher for forwards (sensitivity: 81.8%; precision: 92.1%) when compared with backs (sensitivity: 64.5%; precision: 66.1%). Given that understanding the tackle demands of rugby league is imperative from both an injury-prevention and physical-conditioning perspective there is an opportunity to develop a specific algorithm for the detection of tackles within women's rugby league
INTEREST GROUP SESSION—MENTAL HEALTH PRACTICE AND AGING: INTEGRATION OF SOCIAL DETERMINANTS OF HEALTH IN DEFINING HEALTH BEHAVIORS AND OUTCOMES AMONG DIVERSE OLDER ADULTS
No full textThis is a pre-copyedited, author-produced version of an article accepted for publication in Innovation in Aging following peer review. The version of record Minahan, J., & Baker, T. A. (2019). INTEREST GROUP SESSION—MENTAL HEALTH PRACTICE AND AGING: INTEGRATION OF SOCIAL DETERMINANTS OF HEALTH IN DEFINING HEALTH BEHAVIORS AND OUTCOMES AMONG DIVERSE OLDER ADULTS. Innovation in Aging, 3(Suppl 1), S393. https://doi.org/10.1093/geroni/igz038.1449 is available online at: https://doi.org/10.1093/geroni/igz038.1449.
This work is licensed under a Creative Commons Attribution 4.0 International License.Social determinants of health (SDoH) are conditions in which individuals live, learn, work, and play. Specifically, they are influenced by the distribution of resources, money, and power, and have significant implications on health behaviors and outcomes across the life span. Existent data show the influence these indictors may have in the onset and progression of chronic illnesses. However, much of these data focus on the effect of race and health, as social determinants, but fail to adequately address the myriad other factors (e.g., health care, social and community context) that influence the social patterning across the life course. This symposium presents findings from several studies highlighting the nuanced role of SDoH across diverse populations of older adults. Scholars will present findings on the influence that identified determinants, such as social networks, lifestyle behaviors, and gender, have in defining health outcomes across the life course. Minahan presents the relationship between chronic illnesses and depression and compares depressive symptomatology according to disease cluster in a nationally-representative sample of older adults. Atakere discusses determinants of well-being among African American males with chronic illnesses and the challenges associated with this marginalized population. Booker examines spirituality as a mechanism for pain management among older African Americans and presents this as a crucial determinant of health. This symposium will expand on the existing body of literature by emphasizing social and cultural determinants, aside from race, that influence health behaviors and outcomes across the life span
GPS Data Analytics in Football: A Spotlight on Deceleration
No full textBackground: As technology has improved, the ability to gain data from player monitoring devices has become more prevalent in sport science, especially with the introduction of Global Positioning System (GPS) technology. We know that the ability to rapidly increase velocity is a key element of field-based sports such as football, which require repeated sprint efforts throughout a game. What is less intuitive is the importance of negative acceleration or “deceleration” to team-sport performance. Deceleration is important because it affords players the ability to change direction and avoid collisions. Furthermore, deceleration may be a significant contributor to muscle fatigue and damage, which is an important consideration for performance and recovery. The two predominant metrics used to describe deceleration profiles are the frequency of deceleration efforts and the distance covered whilst decelerating; however, there are flaws with both metrics when considering the deceleration movement. Similarly, as deceleration is a secondary movement to a preceding acceleration, deceleration is opportunistic and cannot be analysed in isolation.
Methods: Activity profiles were collected from twenty male football players competing in the Australian Hyundai A-League during 58 matches throughout two seasons (N = 368 observations). Match data were organised into ten 9-minute periods (i.e., P1: 0 - 9 min) and the time spent accelerating at moderate (1 to 2 m·s−2) and high (> 2 m·s−2) acceleration (ACCM and ACCH, respectively) and the time spent decelerating at moderate (-1 to -2 m·s−2) and high (< -2 m·s−2) deceleration (DECM and DECH, respectively) were quantified. Additionally, deceleration:acceleration and deceleration:high-velocity running ratios were also quantified to interrogate the opportunistic nature of deceleration activity throughout match play. A linear mixed model was used to determine the effects of time on the duration spent accelerating and decelerating, as well as the effect of position and formation on the duration spent accelerating and decelerating.
Results: All four acceleration and deceleration metrics decreased between 23 – 26% from the first 9-min interval to the last 9-min interval. There was a significant effect of time on each metric and each displayed negative logarithmic curves within both halves of football match play. When examining the ratios of deceleration to acceleration and high-velocity running, there was no change in the ratio between DECH duration and total acceleration duration (ACCH + ACCM), while the ratios between DECM duration and total acceleration duration, DECM duration and high-velocity running distance (> 14.4 km·h1), and DECH duration and high-velocity running distance increased as the match progressed.
Discussion: Using negative logarithmic curves to illustrate the acceleration and deceleration decay provides a novel methodological approach to quantify the high-intensity actions during football match play. The decrease in the duration of deceleration efforts throughout match play could simply be attributed to a lack of opportunity, as evident by the increase in the ratio of deceleration:acceleration and deceleration:high-velocity running. This conflicts with the conclusions of previous studies which suggest that deceleration ability is compromised in the latter periods of match play.
Practical Applications: Researchers and practitioners should consider the frequency and intensity of deceleration before making inferences regarding a decrease in a player’s ability to decelerate. By utilising negative logarithmic curves, practitioners can model the decay in acceleration and decelerations profiles. Finally, researchers and practitioners must be aware of the opportunistic nature of deceleration and monitor changes in the ratios of deceleration:acceleration and deceleration:high-velocity running, rather than relying on deceleration values in isolation.Thesis (Masters)Master of Medical Research (MMedRes)School of Medical ScienceGriffith HealthFull Tex
Strong, Fast, Fit, Lean, and Safe: A Positional Comparison of Physical and Physiological Qualities Within the 2020 Australian Women's Rugby League Team
No full textMinahan, C, Newans, T, Quinn, K, Parsonage, J, Buxton, S, and Bellinger, P. Strong, Fast, Fit, Lean, and Safe: A positional comparison of physical and physiological qualities within the 2020 Australian Women's Rugby League team. J Strength Cond Res XX(X): 000-000, 2021-The purpose of the present study was to report the physical and physiological characteristics of elite women Rugby League (RL) players. Thirty-nine women (25.6 ± 4.3 years, 171.3 ± 7.7 cm, 83.5 ± 13.9 kg) from the 2020 Australian women's RL squad were recruited for this study. Players were categorized as adjustables (n = 7), backs (n = 15), or forwards (n = 17) for analysis. Each player was assessed for anthropometry, body composition (dual-energy X-ray absorptiometry), speed (5, 10 and 20 m sprint times), lower-body power (countermovement jump), upper-body power (medicine ball throw and explosive push up force), estimated one repetition maximum (e1RM) bench press, squat and bench pull, isometric mid-thigh pull strength, eccentric knee flexor strength, isometric hip abduction and adduction, and intermittent endurance performance (30-15 intermittent fitness test; 30-15 IFT). Linear mixed models were performed to compare positional groups. Forwards were significantly heavier and had greater fat mass, fat-free mass, and body fat percentage compared with backs and adjustables (P < 0.01). Backs were faster over 20 m compared with forwards (P = 0.025), whereas forwards had a lower 30-15 IFT peak velocity and estimated V[Combining Dot Above]O2peak compared with backs and adjustables. Nonetheless, when including body mass in the model, there were no differences between groups in 30-15 IFT peak velocity. There were no significant differences in other variables. These results provide contemporary benchmark physical, physiological, and anthropometric data for elite women RL players, which can inform recruitment, selection, training, and testing.No Full Tex
Characterising the movement patterns of women's beach volleyball using global positioning systems
No full textThe aim of this thesis was to describe the movement patterns of women’s beach volleyball using global positioning systems (GPS) technology. This aim was completed in two parts: Part A involved the investigation of the level of agreement between an emerging GPS system (VX Sport VX235 Log, Visuallex Sport International Ltd, Lower Hutt, New Zealand) and a well- established GPS system (Catapult MinimaxX S4, Catapult Innovations, Melbourne Australia). We recruited five semi-professional beach volleyball athletes who wore the two GPS units (sampling at 10 Hz) simultaneously during a training session which involved beach volleyball drills and simulated match-play. A paired sample t-test with statistical significant set to p<0.05 was applied to examine whether differences existed in the measurements of total distance (m), average speed (m∙min-1), max velocity (m∙s-1) and the distance (m) covered in five distinct velocity zones during a beach volleyball training session between the two different brands of GPS units. Significantly greater average speed (38.3 ± 5.66 m∙min-1, p = 0.009), and the distance covered between speeds of 4-8 km∙h-1 (248 ± 207 m, p = 0.008) and 16-20.5 km∙h-1 (8.78 ± 7.40 m, p = 0.006) were reported by the Catapult S4 units compared to the VX235 GPS units (35.9 ± 3.45 m∙min-1, 206 ± 168 m and 1.64 ± 2.62 m respectively), in conjunction with the VX235 units reporting a greater max velocity (4.37 ± 0.68 m∙s-1, p = 0.013) compared to the Catapult S4 units (4.07 ± 0.60 m∙s-1). These results demonstrate that differences exists between the emerging VX235 GPS system and the well-established Catapult S4 GPS system for measuring the movement patterns during beach volleyball, supporting the notion that further validation of GPS units against other practically applied and validated athlete movement trackers is required to further understand the ability of GPS systems to measure the movement patterns of beach volleyball.
Part B of this thesis involved the application of the 10 Hz VX235 GPS unit to quantify the movement patterns of women’s beach volleyball match-play. Specifically the VX235 GPS unit was worn by twenty female beach volleyball athletes during competition matches from the U23 Australian beach volleyball championship (n=10) and the Queensland Open tournament (n=10). The results form Part B of this thesis describe women’s beach volleyball athletes as covering a total distance of 555 ± 129 m and an average speed of 36.2 ± 3.2 m∙min-1, in addition to the majority of the distance covered occurred at speeds between 0-3.9 km∙h-1 (274 ± 63.6 m) and 3.9-7.8 km∙h-1 (203 ± 57.3) during match-play. The magnitude of these physical measures resulted in an average heart rate of 159 ± 12.0 bpm and 71.3 ± 30.4% of time with a heart rate ≤168 bpm. An independent sample t-test with statistical significant set to p5 points). A paired sample t-test with statistical significant set to p 5). In addition all physiological measures of heart rate displayed no significant difference between sets that ended with a small score margin and sets that ended with a large score margin with the exception of the percentage of time spent with a heart rate between 80-85% of each athletes age-predicted max heart rate which was significantly greater for sets that ended with a small score margin (25.8 ± 16.3%, p = 0.013) compared to sets that ended with a large score margin (16.0 ± 17.1%). The results from Part B of this thesis were the first to identify the movement patterns of women’s beach volleyball and provide insight into the presence of fatigue and the effect of score margin differential. The results provide information to assist in preparing women’s beach volleyball athletes for the demands they are likely to undertake during competitive match-play.Thesis (Masters)Master of Medical Research (MMedRes)School of Medical ScienceGriffith HealthFull Tex
The Effects of Mindfulness Training on Indices of Cognition, Stress and Immune Function in Team-Sport Athletes
No full textHuman potential is a fascinating concept. The saying, ‘you can achieve anything if you set your mind to it,’ has certainly passed through my ears on many occasion. I look at some of the greatest athletes in recent history: Michael Phelps, Kelly Slater, Roger Federer, Kobe Bryant in awe of what they have achieved and wonder: what makes them so great? How have they managed to achieve what they have? Undoubtedly, incredible natural talent, physical stature, and mental attributes such as determination, perseverance and self-belief contribute to their success. But I’ve always believed there’s more to it; they all possess the ability to achieve a superlative mental focus during competition. But how do they put their entire focus on the task at hand in such highly stressful and physically demanding situations? Could it be that they have the ability to achieve a heightened state of mindfulness?
In 2014, the Seattle Seahawks achieved the unthinkable and won the 48th Super Bowl; the 2014 NFL championship. Head coach, Pete Carroll, attributed their success to the help of Michael Gervais, one of the world’s leading performance psychologists. In an interview following the Super Bowl win, Gervais was asked, ‘Obviously your end goal was winning, but what were your strategies with the Seahawks?’ At that point, Gervais’s tone of voice changed, almost concerned, and responded: ‘See, we don’t talk about winning. The goal for us is to be fully engaged at a really rich level to figure out and explore what is possible in your own life. And, if you get enough people resonating in that space, winning just happens
as a result of this.’ Michael Gervais brought mindfulness training to the Seattle Seahawks and it has since become an integral part of their training regime.Thesis (PhD Doctorate)Doctor of Philosophy (PhD)School of Allied HealthGriffith HealthFull Tex
MULTIMORBIDITY IN OLDER ADULTS: CAN DISEASE CLUSTER PREDICT DEPRESSION SEVERITY?
No full textThis is a pre-copyedited, author-produced version of an article accepted for publication in Innovation in Aging following peer review. The version of record Minahan, Jacquelyn. “MULTIMORBIDITY IN OLDER ADULTS: CAN DISEASE CLUSTER PREDICT DEPRESSION SEVERITY?.” Innovation in Aging vol. 3,Suppl 1 S393–S394. 8 Nov. 2019, doi:10.1093/geroni/igz038.1450 is available online at: https://doi.org/10.1093/geroni/igz038.1450.
This work is licensed under a Creative Commons Attribution 4.0 International License.Multimorbidity, defined as the co-occurrence of two or more chronic conditions, is positively correlated with depression severity among older adults. However, few studies have compared depression outcomes by disease cluster. To address this gap, secondary data analyses were performed using data from the National Social Life, Health, and Aging Project (NSHAP), Wave 2. For the purpose of this study, disease clusters are composed of conditions that implicate similar body systems (e.g., musculoskeletal system, cardiovascular system). Participants reported an average of 2.69 (+/- 1.97) chronic conditions. Multimorbidity and depressive symptom severity, as measured by the Center for Epidemiological Studies – Depression, Iowa Form (CES-D) were positively associated (p<0.001). Individual disease clusters, age, self-identifying as female, and lower educational attainment were predictive of depressive symptom severity (p<0.001). Findings support the necessary inclusion of social determinants (health status, gender, education, age) in the conceptualization of health and health outcomes within an aging population
The Effect of β-Alanine Supplementation on Exercise Performance and Metabolism in Trained Cyclists
No full textIt seems like you can't open a cycling magazine, read a running forum, or speak to an exercise enthusiast without being drawn into a discussion about sports nutrition supplements. For decades, marketers have been targeting audiences with sponsorship and images highlighting the association between sports nutrition supplement consumption and successful sportsmen, sportswomen and sporting events. One supplement that has attracted recent attention is β-alanine. With article headlines such as "β-alanine - the new kid on the ergogenic block" and "β-alanine - the natural messiah for intense exercise" becoming ever so common, it would seem that β-alanine is the new magic bullet. There is a slowly growing body of literature to support the use of β-alanine in specific groups of athletes. However, additional research is required to fine-tune protocols for individualised and event-specific use. This thesis focuses on new scientific evidence behind issues relating to β-alanine supplementation and high-intensity endurance exercise performance.Thesis (PhD Doctorate)Doctor of Philosophy (PhD)School of Allied HealthGriffith HealthFull Tex
An Integrative Examination of Selected Biological & Affective Parameters in Response to a Micro-Dose of Resistance-Exercise
No full textThis present project is composed of three distinct but related studies which employed a novel thumb resistance-exercise protocol common to each study. The overall aim was to address the following needs in exercise-centred research: i) to understand the biological and affective implications of a very low-dose (micro-dose) of resistance-exercise on resistance-trained and untrained men; ii) to improve the standardisation of exercise protocols used in resistance-exercise research and therefore the validity of outcomes; iii) to explore the multidimensional consequences of resistance-exercise on host (human) biology which will lead to safer, more efficacious exercise prescription and monitoring practice. Study 1 examined the effects of a micro-dose of thumb resistance-exercise on leukocyte redistribution, thumb pinch-strength, and reported fatigue. The effect of training status was also studied. Developing on the findings of study 1, study 2 investigated the effects of the thumb exertion on lymphocyte subpopulation trafficking, and explored the potential role of blood lactate in regulating lymphocyte-selective redistribution. Study 3 examined the effects of the thumb exertion on serological dehydroepiandrosterone-sulfate (DHEA-S), interleukin (IL)-6 and mood-state determinants. Potential relationships between mood and the biomarkers were studied with the aim of directing research on safer, non-invasive exercise-monitoring methods.Thesis (PhD Doctorate)Doctor of Philosophy (PhD)School of Allied HealthGriffith HealthFull Tex
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