Facing transition phase two: Analysing actor strategies in a stagnating acceleration phase

2022 ◽  
Vol 174 ◽  
pp. 121221
Author(s):  
Meike Löhr ◽  
Jannika Mattes
Keyword(s):  
Transition Phase ◽  
Acceleration Phase

scholarly journals Phase analysis in maximal sprinting: an investigation of step-to-step technical changes between the initial acceleration, transition and maximal velocity phases.

2017 ◽  
Author(s):  
Hans Cristian von Lieres und Wilkau ◽  
Gareth Irwin ◽  
Neil E. Bezodis ◽  
Scott Simpson ◽  
Ian N. Bezodis
Keyword(s):  
Phase Analysis ◽  
Sagittal Plane ◽  
Maximum Velocity ◽  
Transition Phase ◽  
Maximal Velocity ◽  
Centre Of Mass ◽  
Acceleration Phase ◽  
Video Cameras ◽  
Large Step ◽  
Initial Acceleration

The aim of this study was to investigate spatiotemporal and kinematic changes between the initial acceleration, transition and maximum velocity phases of a sprint. Sagittal plane kinematics from five experienced sprinters performing 50 m maximal sprints were collected using six HD-video cameras. Following manual digitising, spatiotemporal and kinematic variables at touchdown and toe-off were calculated. The start and end of the transition phase were identified using the step to step changes in centre of mass height and segment angles. Mean step to step changes of spatiotemporal and kinematic variables during each phase were calculated. Firstly, the study showed that if sufficient trials are available, step-to-step changes in shank and trunk angles might provide an appropriate measure to detect sprint phases in applied settings. However, given that changes in centre of mass height represent a more holistic measure, this was used to sub-divide the sprints into separate phases. Secondly, during the initial acceleration phase large step to step changes in touchdown kinematics were observed compared to the transition phase. At toe-off, step-to-step kinematic changes were consistent across the initial acceleration and transition phases before plateauing during the maximal velocity phase. These results provide coaches and practitioners with valuable insights into key differences between phases in maximal sprinting.

scholarly journals A Wind-Storage Combined Frequency Regulation Control Strategy Based on Improved Torque Limit Control

2021 ◽  
Vol 13 (7) ◽  
pp. 3765
Author(s):  
Benxi Hu ◽  
Fei Tang ◽  
Dichen Liu ◽  
Yu Li ◽  
Xiaoqing Wei
Keyword(s):  
Control Strategy ◽  
Storage System ◽  
Energy Storage System ◽  
Frequency Regulation ◽  
Small Scale ◽  
Acceleration Phase ◽  
Deceleration Phase ◽  
Combined Control ◽  
Inertial Response ◽  
Battery Energy

The doubly-fed induction generator (DFIG) uses the rotor’s kinetic energy to provide inertial response for the power system. On this basis, this paper proposes an improved torque limit control (ITLC) strategy for the purpose of exploiting the potential of DFIGs’ inertial response. It includes the deceleration phase and acceleration phase. To shorten the recovery time of the rotor speed and avoid the second frequency drop (SFD), a small-scale battery energy storage system (BESS) is utilized by the wind-storage combined control strategy. During the acceleration phase of DFIG, the BESS adaptively adjusts its output according to its state of charge (SOC) and the real-time output of the DFIG. The simulation results prove that the system frequency response can be significantly improved through ITLC and the wind-storage combined control under different wind speeds and different wind power penetration rates.

Study of the thermal behavior of the transition phase of Co(II)–diclofenac compound by non-isothermal method

2010 ◽  
Vol 105 (2) ◽  
pp. 467-471 ◽  
Author(s):  
Marcelo Kobelnik ◽  
Clóvis A. Ribeiro ◽  
Diógenes dos Santos Dias ◽  
Sonia de Almeida ◽  
Marisa Spirandeli Crespi ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Transition Phase ◽  
Isothermal Method

Revisiting the empirical model ‘Phases in the junior-to-senior transition of Swedish ice hockey players’: External validation through focus groups and interviews

2017 ◽  
Vol 12 (6) ◽  
pp. 747-761 ◽  
Author(s):  
Sebastian Pehrson ◽  
Natalia B Stambulova ◽  
Kasper Olsson
Keyword(s):  
Focus Groups ◽  
Empirical Model ◽  
External Validation ◽  
Transition Process ◽  
Transition Phase ◽  
Ice Hockey ◽  
Future Research ◽  
Theoretical Frameworks ◽  
Four Seasons ◽  
Hockey Players

In this study, we continue to explore the junior-to-senior transition process in Swedish ice hockey by validating the empirical model ‘Phases in the junior-to-senior transition of Swedish ice hockey players’ created in our previous study.1 More specifically, we collected opinions and critical reflections of 15 senior professional players and expert coaches about the empirical model as a whole and about the content of each junior-to-senior transition phase and then converted the original empirical model into its validated version. Professional ice hockey players and first league coaches formed three focus groups, while three senior coaches were interviewed individually. All were encouraged to critically reflect on the empirical model. The data from all sources were analysed following guidelines of the thematic (deductive) analysis complemented by quantitative measurements of the participants’ agreement with the content of the empirical model. Results supported the sequence and designations of the junior-to-senior transition phases (i.e. preparation, orientation, adaptation and stabilization), as well as duration of the junior-to-senior transition (i.e. up to four seasons) outlined by the empirical model. We were also able to validate the psychological content (perceived demands, resources, barriers, coping strategies and outcomes) of each transitional phase. Accordingly, five themes were reformulated, 17 new themes were added and some themes were re-ordered during the conversion of the original empirical model into the validated model. To improve the readability of the validated model (from the bottom to the top), we also re-ordered sub-categories describing the psychological content of each junior-to-senior transition phase. We conclude by discussing the validated model in relation to theoretical frameworks and previous research and providing some methodology, future research and practice-oriented reflections addressed to researchers, coaches and sport psychology practitioners.

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