Browsing by Author "Lambert, M"

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    Fitness and body composition profiling of elite junior South African rugby players
    (2006) Durandt, J; Du Toit, S; Borresen, J; Hew-Butler, T; Masimla, H; Jakoet, I; Lambert, M
    Objective. The aim of this study was to describe the body composition, strength and speed characteristics of elite junior South African rugby players. Design. Cross-sectional. Setting. Field study. Subjects. Rugby players (16 and 18 years old, N = 174) selected for the South African Rugby Union National Green Squad. Outcome measures. Body composition, 10 m and 40 m speed, agility, 1RM bench press, underhand pull-ups, push-ups, multistage shuttle run. Results. The under-16 players were on average shorter (175.6 ± 5.7 v. 179.2 ± 6.7 cm), weighed less (76.5 ± 8.2 v. 84.8 ± 8.3 kg) had less upper body absolute strength (77.1 ± 11.8 kg v. 95.3 ± 16.7 kg) and muscular endurance (41 ± 12 v. 52 ± 15 push-ups) and aerobic fitness (87.1 ± 19.4 v. 93.5 ± 15.3 shuttles) than the under-18 players. There were no differences in body fat, sprinting speed (10 m and 40 m) or agility between the two age groups. There were differences between playing positions, with the props having the most body fat, strongest upper bodies, slowest sprinting speed, least agility and lowest aerobic capacity compared with players in the other positions. Conclusion. This study provides data for elite junior rugby players and can be used to monitor the progression of players after intervention while also assisting with talent identification for the different playing positions.
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    The validation of muscle power output measures in lower and upper body resistance exercises
    (2009) Schoeler, Gunnar; Lambert, M; Viljoen, Wayne
    The reliability and comparability of results obtained from different methods of assessment has been the source of debate for the last decade. Aim: To investigate the reliability and comparability of measurements of force, velocity and power measured simultaneously during upper and lower body resistance exercises for the following three methods: a) power derived from ground reaction force, i.e. using a force plate (FP), b) power derived from the displacement of the bar, i.e. displacement tracking laser (L) and c) power as a combination of force derived from ground reaction force (FP) and velocity derived from the displacement of the bar (L) (FPL). Methods: 15 Males with a history of resistance training of at least one year participated in the study.