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Effectiveness of a low-frequency sports-specific resistance and plyometric training programme
Geoff Middleton,Daniel C. Bishop,Chris Smith,Thomas I. Gee 한국코칭능력개발원 2016 International Journal of Coaching Science Vol.10 No.2
This intervention aimed to improve Badminton-specific functional performance of an elite under-19 player (18 years) via a single-weekly resistance and plyometric training (RPT) session for 8-weeks. The athlete’s ‘response-to’ and ‘withdrawal-from’ the RPT were assessed. The athlete (stature: 1.77 m, mass: 81.5 kg) completed the RPT intervention throughout a competitive season. Performance testing was conducted at; baseline, post-intervention (8-weeks) and after withdrawal-from the RPT (16-weeks). Jump height and throwing distance were assessed via countermovement jump (CMJ), standing long-jump (SLJ) and one-arm (1-MBT) and two-arm (2-MBT) medicine-ball throws respectively. Speed and agility were assessed by 5 m and 10 m sprints and ‘sideways’ and ‘four-corner’ tests respectively. A positive change from baseline to post-intervention (8-weeks) was observed in: CMJ (+0.07 m), SLJ (+0.13 m), 1-MBT (+2.25 m) and 2-MBT (+0.26 m). Observed changes in speed and agility were minimal. At the 16-weeks, small declines in CMJ, SLJ, 1-MBT and 2-MBT (0.04 m, 0.04 m, 0.52 m and 0.05 respectively) existed. Small improvements in 5 and 10 m sprint times (-0.12 s to -0.09 s) and side-ways agility were observed (-0.11 s to -0.39 s), possibly explained by conditioning effects of training and competition. An 8-week Badminton-specific RPT programme provided favourable increases in jumps and MB throws. However, such positive changes were not sustained following the withdrawal period.
Temperature dependence of optical and transport properties in VO₂ with high temperature anomalies
Angus Gentle,Abbas Maaroof,Geoff Smith 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Thermochromic VO₂ is of interest for energy ecient glazing, and for fast telecommunications because it optically switches in the nearIR. Despite extensive study several aspects of its apparently diverse behaviour have not been explained satisfactorily. The visibleNIRpermittivity and dc electrical conductivity of high quality thin lms of VO₂, across the metalinsulator phase transition and well into themetallic phase to temperatures up to 100℃ above Tc are studied as a function of temperature and grain size. Experimental behaviour ispartly explained with eective medium models, existing band structures and classical transport theory. Anomalies however include:unphysically fast relaxation rate, counter-intuitive and signicant dierences between optical and dc, and bulk and thin lm parameters;and residual ‘‘non-metallic’’ features above the transition in highly oriented lms. Residual, but transient high temperature d-electronsinglet pairing on V dimers, which is sensitive to nanostructure, is examined as a source of some anomalies.