Application of velocity loss thresholds during free-weight resistance training: Responses and reproducibility of perceptual,metabolic, and neuromuscular outcomes     

Jonathon Weakley  Shaun McLaren  Carlos Ramirez-Lopez  Amador García-Ramos  Nick Dalton-Barron  Harry Banyard 《Journal of sports sciences》2020,38(5):477-485

ABSTRACT

The aim of this study was to investigate the differences and long-term reliability in perceptual, metabolic, and neuromuscular responses to velocity loss resistance training protocols. Using a repeated, counterbalanced, crossover design, twelve team-sport athletes completed 5-sets of barbell back-squats at a load corresponding to a mean concentric velocity of ~0.70 m·s^?1. On different days, repetitions were performed until a 10%, 20% or 30% velocity loss was attained, with outcome measures collected after each set. Sessions were repeated after four-weeks. There were substantial between-protocol differences in post-set differential ratings of perceived exertion (dRPE, i.e., breathlessness and leg muscles, AU) and blood lactate concentration (B[La], mmol·L^?1), such that 30%>20%>10% by small to large magnitudes. Differences in post-set countermovement jump (CMJ) variables were small for most variables, such that 30%<20%<10%. Standard deviations representing four-week variability of post-set responses to each protocol were: dRPE, 8–11; B[La], 0.8–1.0; CMJ height, 1.6–2.0; CMJ PPO, 1.0–1.8; CMJ PCV, 0.04–0.06; CMJ 100ms-Impulse, 5.7–11.9. Velocity loss thresholds control the magnitude of perceptual, metabolic, and neuromuscular responses to resistance training. For practitioners wanting to reliably prescribe training that can induce a given perceptual, metabolic, or neuromuscular response, it is strongly advised that velocity-based thresholds are implemented.  相似文献   

Validity and reliability of a linear positional transducer across commonly practised resistance training exercises     

Harry F. Dorrell  Joseph M. Moore  Mark F. Smith  Thomas I. Gee 《Journal of sports sciences》2019,37(1):67-73

This study investigated the validity and reliability of the GymAware PowerTool (GPT). Thirteen resistance trained participants completed three visits, consisting of three repetitions of free-weight back squat, bench press, deadlift (80% one repetition maximum), and countermovement jump. Bar displacement, peak and mean velocity, peak and mean force, and jump height were calculated using the GPT, a three-dimensional motion capture system (Motion Analysis Corporation; 150 Hz), and a force plate (Kistler; 1500 Hz). Least products regression were used to compare agreeability between devices. A within-trial one-way ANOVA, typical error (TE; %), and smallest worthwhile change (SWC) were used to assess reliability. Regression analysis resulted in R² values of >0.85 for all variables excluding deadlift mean velocity (R² = 0.54–0.69). Significant differences were observed between visits 3-2 for bench press bar displacement (0.395 ± 0.055 m; 0.383 ± 0.053 m), and deadlift bar displacement (0.557 ± 0.034 m; 0.568 ± 0.034 m). No other significant differences were found. Low to moderate TE (0.6–8.8%) were found for all variables, with SWC ranging 1.7–7.4%. The data provides evidence that the GPT can be used to measure kinetic and kinematic outputs, however, care should be taken when monitoring deadlift performance.  相似文献   

The Fatimid Empire     

Harry Munt 《Al-Masaq: Islam & the Medieval Mediterranean》2019,31(1):114-115

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Welcome to issue 23(3) of the Journal!     

Harry Daniels 《Emotional and Behavioural Difficulties》2018,23(3):227-229

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Governance and decision-making in higher education     

Leo Goedegebuure  Dr Harry de Boer 《Tertiary Education and Management》1996,2(2):160-169

Concluding Observations From the presentations of the survey outcomes is has become clear that substantial differences exist between both types of institutions as well as between countries. To a large extent, the results for the universities in particular still reflect the dominant notion of professional expertise, especially where the primary processes of teaching and research are concerned. At the same time, it also has become clear that the role of the central institutional administration is a non-negligible factor in higher education, especially for what we can call the ‘non-primary processes’ issues. With respect to differences between countries, the study shows substantial variation between the countries. This alone appears to provide sufficient basis to question the general assumption of the continental model. On the European continent clearly different institutional governance systems exist, and it would appear logical to relate these to the different ways in which national governments in these systems have changed their policies and policy priorities over the years. However, to shed further light on these differences, a more detailed analysis of the data will have to be performed, for example relating the survey out-comes to differences in governmental steering paradigms.  相似文献   

Dangerous liaisons: Reflections on a pilot project for state-mandated outcomes assessment of written communication     

Harry C.   《Assessing Writing》2008,13(1):26-44

This study details the development and results of a campus-based writing assessment plan that was mandated by a state-wide university system in order to explore the “value-added” from a writing program curriculum to undergraduate students’ competence with written expression. Four writing samples (two timed essays and two conventional essays) that are produced before, during and at the close of enrollment in the writing program are scored for critical thinking, genre knowledge, rhetorical skills, and mechanics. The results indicate that local campus student achievement related to writing is comparable with performance captured by nationally normed technologies and larger assessment projects at similar state universities. The data also suggest significant performance difference related to the institutional position of students’ instructors as well as students’ own enrollment status. The article concludes that while the data produced by this research project are compelling, the policy and political implications of the undertaking suggest greater sensitivity to the institution's culture and program direction as well as its impact on instructor morale, student learning environment and the place of composition studies in the university.  相似文献   

U Crazy     

Harry Stein 《Academic Questions》2011,24(4):489-493

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Audio-Visual Training in the Netherlands     

Harry J L Jongbloed 《Educational Media International》2013,50(2)

In 1972 the Netherlands Institute for Audio-Visual Media (NIAM) in the Hague established a new department in Rotterdam to provide information and advice on the selection of audiovisual equipment and training in the use and applications of the different media. The information service was to be provided free of charge, but a fee would be charge for the training courses.  相似文献   

Report on the ‘European exchange of experiences in school integration’: the intercultural comparison of the quality of life of children and youth with handicaps in Arhus (Denmark), Arezzo (Italy), Greenwich (London,UK) and Reutlingen (Germany)     

Harry Daniels  Bob Hogg 《欧洲特需教育杂志》2013,28(2):104-116

ABSTRACT

This article describes some aspects of a multi‐disciplinary exchange and research programme involving communities in Denmark, Germany, Italy and the United Kingdom. The major focus of the programme has been on the integration of children with special educational needs into mainstream settings in schools and communities with a specific reference to decision making processes. The point at which extra resources are given by the state and its agencies to an individual in need provides the unifying intercultural point of departure. Local cultures, including legislative and social imperatives, and their implications for research activity are discussed. Common themes in the transition and transformation of the various forms of welfare state provision within the member countries are identified and analysed. The relationship between different forms and levels of service provision and the practice of integration are discussed.  相似文献   

TAKE UP THE CHALLENGE     

Harry N. Rivlin 《Equity & Excellence in Education》2013,46(1):6-11

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