ORCID Profile
0000-0003-4654-0179
Current Organisations
Victoria University
,
Deakin University
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Publisher: Wiley
Date: 22-02-2022
DOI: 10.1113/JP282744
Publisher: MDPI AG
Date: 28-01-2020
Abstract: The physical qualities that underpin successful junior judokas requires continuing investigation. We investigated the physical and physiological characteristics of junior national level judokas. We tested 25 (15 male, 10 female) Indian judokas for absolute and relative strength (back-squat and bench-press one-repetition maximum (1RM) as well as isometric handgrip), aerobic (RAMP test) and lower-body anaerobic power (Wingate 6-s sprint and countermovement jump), change-of-direction (5-0-5 test) and speed (30 m sprint). Athletes were grouped according to national-level competition placing (gold-medal winners (GM n = 8), all medal winners (MW n = 13), non-medallists (NM n = 12), and NM plus silver and bronze all others (AO n = 17)). Stepwise discriminant function analysis determined characteristics likely to predict successful performance. Independent t-tests and effect size (Hedge’s g) analyses were performed between groups. GM demonstrated greater lower-body absolute (20.0% g = 0.87, p = 0.046) and relative 1RM strength (21.0% g = 0.87, p = 0.047), and greater lower-body absolute (25.4% g=1.32, p=0.004) and relative (27.3% g = 1.27, p = 0.005) anaerobic power compared to AO. Furthermore, anaerobic power can correctly predict 76.5% and 62.5% of AO and GM athletes, respectively. No differences were observed between MW and NM groups. The results suggest the importance of lower-body strength and power for junior national-level judokas and provides information for professionals working with these athletes.
Publisher: Springer Science and Business Media LLC
Date: 16-07-2018
Publisher: SAGE Publications
Date: 24-08-2020
Abstract: Limited evidence exists demonstrating reliability of using direct measures to quantify punching velocity. The aim of this study was to establish the intra- and inter-day reliability of a linear positional transducer (GymAware) and accelerometer (PUSH Band 2.0) for the quantification of peak punching velocity in trained junior boxing athletes. Eighteen males aged 16.7 years (±1.2) with at least two years of boxing experience participated in the study. On two separate days, participants performed five dominant-hand crosses with maximal effort. Ordinary least-products regression analysis was used to compare mean and maximum peak velocity scores between devices within each day of testing. Two-way mixed intraclass correlation coefficients (ICC 3,1 ) and Pearson’s r with 95% confidence intervals (95%CI) were also used to compare mean and maximum peak velocity within devices across days. Maximum peak (∼7.5 ms vs. ∼6.2 ms) and mean peak (∼7.0 ms vs. 5.4 ms) velocity was higher when measured via GymAware compared to PUSH Band 2.0 on both days (all P ≤ 0.012). The within-device mean (ICC 3,1 = 0.871, 95%CI = 0.689, 0.950) and maximum (ICC 3,1 = 0.853 95%CI = 0.650, 0.942) peak velocity scores for the GymAware across Days 1 and 2 demonstrated very high reliabilities. Mean (ICC 3,1 = 0.309, 95%CI = –0.170, 0.670) and maximum (ICC 3,1 = 0.227, 95%CI = –0.173, 0.637) peak velocity for PUSH Band 2.0 demonstrated weak reliabilities. Proportional bias was found for Day 2 mean and maximum peak velocity and when both days were pooled. Fixed bias was observed for mean (Day 1) and maximum peak velocity when both days were pooled. These results may provide useful information for professionals working with boxing or combat-sport athletes.
Publisher: SAGE Publications
Date: 29-01-2023
DOI: 10.1177/17479541221151195
Abstract: Although the impacts of traditional sets (TS) versus cluster (CL) sets resistance training have been broadly explored among recreationally trained populations, no studies have previously compared these set configurations among elite Judokas. Twenty-two elite male and female Judokas (age = 17.5 ± 1.2 years) performed identical periodized 4-week hypertrophy and strength blocks (8 weeks in total). Following this, for the final 4-week power training block, the cohort was separated into either TS (n = 11) or CL (n = 11) set structures. CL were prescribed by including 45-second intra-set rest every two repetitions. One-repetition maximum (1RM) and peak barbell velocities of the back squat and bench press, and countermovement (CMJ) jump height were assessed before and following each 4-week mesocycle. Significant strength and power improvements were observed after the 4-week hypertrophy training block (1RM bench press = Δ3.82 kg, ES [95% CI] = 1.34 [0.76, 1.93], p 0.001 1RM squat = Δ4.71 kg, ES = 0.52 [0.07, 0.96], p = 0.024 CMJ height = Δ0.54 cm, ES = 0.62 [0.16, 1.07], p = 0.008) and after the 4-week maximal strength training block (1RM bench press = Δ1.5 kg, ES = 0.68 [0.21, 1.41], p = 0.004 1RM squat = Δ5.47 kg, ES = 0.61 [0.15, 1.06], p = 0.010 CMJ height = Δ0.45 cm, ES = 0.71 [0.23, 1.17], p = 0.003). However, no time × group differences were observed between the TS and CL groups following the 4-week power training block. Though traditional periodized resistance training improved neuromuscular qualities of elite junior Judokas, no between-group neuromuscular differences using either TS or CL suggests that both methods may be used as part of periodized training programs.
Publisher: Springer Science and Business Media LLC
Date: 30-10-2021
DOI: 10.1186/S12877-021-02555-6
Abstract: Falls are a major health burden for older adults with Parkinson’s disease (PD), but there is currently no reliable questionnaire to capture the circumstances and consequences of falls in older adults with PD. This study aimed to develop a PD-specific falls questionnaire and to evaluate its test-retest reliability in older adults with PD. A novel PD-specific falls questionnaire (PDF-Q) was developed in two modes (online and paper-based version) and used to assess falls and near-falls events over the past 12-months. Questions were agreed upon by an expert group, with the domains based on previous falls-related questionnaires. The questions included the number and circumstances (activities, location and direction) of falls and near-falls, and consequences (injuries and medical treatment) of falls. The PDF-Q was distributed to 46 older adults with PD (online n = 30, paper n = 16), who completed the questionnaire twice, 4 weeks apart. Kappa (κ) statistics were used to establish test-retest reliability of the questionnaire items. Pooled results from both questionnaires for all participants were used to assess the overall test-retest reliability of the questionnaire. Questions assessing the number of falls ( κ = 0.41) and the number of near-falls ( κ = 0.51) in the previous 12-months demonstrated weak agreement, while questions on the location of falls ( κ = 0.89) and near-falls ( κ = 1.0) demonstrated strong to almost perfect agreement. Questions on the number of indoor ( κ = 0.86) and outdoor ( κ = 0.75) falls demonstrated moderate to strong agreement, though questions related to the number of indoor ( κ = 0.47) and outdoor ( κ = 0.56) near-falls demonstrated weak agreement. Moderate to strong agreement scores were observed for the most recent fall and near-fall in terms of the direction (indoor fall κ = 0.80 outdoor fall κ = 0.81 near-fall κ = 0.54), activity (indoor fall κ = 0.70 outdoor fall κ = 0.82 near-fall κ = 0.65) and cause (indoor fall κ = 0.75 outdoor fall κ = 0.62 near-fall κ = 0.56). The new PDF-Q developed in this study was found to be reliable for capturing the circumstances and consequences of recent falls and near-falls in older adults with PD.
Publisher: American Geophysical Union (AGU)
Date: 03-2020
DOI: 10.1029/2019JB018314
Abstract: Markov chain Monte Carlo (MCMC) methods have become standard in Bayesian inference and multi‐observable inversions in almost every discipline of the Earth sciences. In the case of geodynamic and/or coupled geophysical‐geodynamic inverse problems, however, the computational cost associated with the solution of large‐scale 3‐D Stokes forward problems has rendered probabilistic formulations impractical. Here we present a novel and extremely efficient method to produce ultrafast solutions of the 3‐D Stokes problem for MCMC simulations. Our approach combines the in idual benefits of Reduced Basis techniques, goal‐oriented error formulations, and MCMC algorithms to produce an accurate and computationally efficient surrogate for the forward problem. Importantly, the surrogate adapts itself during the MCMC simulation according to the history of the chain and the goals of the inversion. This maximizes the efficiency of the forward problem and removes the need for preinversion off‐line computations to build a surrogate. We demonstrate the benefits and limitations of the method with several numerical ex les and show that in all cases the computational cost is of the order of % compared to a traditional MCMC approach. The method is general enough to be applied to a range of problems, including uncertainty quantification ropagation, adjoint‐based geodynamic inversions, sensitivity analyses in mantle convection problems, and in the creating surrogate models for complex forward problems (e.g., heat transfer, seismic tomography, and magnetotellurics).
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 04-2019
DOI: 10.1519/SSC.0000000000000426
Abstract: THERE IS A PAUCITY OF SPORT-SPECIFIC EVIDENCE REGARDING STRENGTH AND CONDITIONING STRATEGIES TO IMPROVE ELITE JUDO ATHLETES' (EJA) PERFORMANCE. THEREFORE, THE AIM OF THIS ARTICLE IS TO EVALUATE THE CURRENT LITERATURE AND PRESENT EVIDENCE-BASED TRAINING RECOMMENDATIONS FOR EJA. BASED ON THE SPORT-SPECIFIC DEMANDS, APPROPRIATELY SEQUENCED PERIODIZED STRENGTH AND CONDITIONING PROGRAMS THAT INCLUDE (a) HEAVY STRENGTH TRAINING, (b) POWER TRAINING (i.e., CONTRAST LOADING, CLUSTER SETS, WEIGHTLIFTING, AND PLYOMETRIC EXERCISES), AND (c) HIGH-INTENSITY INTERVAL TRAINING MAY PROVIDE SUFFICIENT STIMULI TO IMPROVE UPPER- AND LOWER-BODY STRENGTH, AEROBIC AND ANAEROBIC POWER FOR EJA.
Publisher: Frontiers Media SA
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 06-09-2017
DOI: 10.1007/S00421-017-3709-7
Abstract: Although neural adaptations from strength training are known to occur, the acute responses associated with heavy-strength (HST) and hypertrophy training (HYT) remain unclear. Therefore, we aimed to compare the acute behaviour of corticospinal responses following a single session of HST vs HYT over a 72-h period. Fourteen participants completed a random counterbalanced, crossover study that consisted of a single HST session [5 sets × 3 repetition maximum (RM)], a HYT session (3 sets × 12 RM) of the leg extensors and a control session (CON). Single- and paired-pulse transcranial magnetic stimulation (TMS) was used to measure changes in motor-evoked potential (MEP) litude, corticospinal silent period (CSP), intra-cortical facilitation (ICF), short-interval intra-cortical inhibition (SICI) and long-interval intra-cortical inhibition (LICI). Additionally, maximal muscle compound wave (M A significant condition x time interaction was observed for MVIC (P = 0.001), M Our results suggest that: (1) the acute behaviour of neurophysiological measures is similar between HST and HYT and (2) the increase in corticospinal excitability may be a compensatory response to attenuate peripheral fatigue.
Publisher: Wiley
Date: 17-10-2022
DOI: 10.1113/JP283759
Publisher: Frontiers Media SA
Date: 07-09-2015
No related grants have been discovered for Dale Harris.