The influence of chronological age on periods of accelerated adaptation of stretch-shortening cycle performance in pre- and post-pubescent boys
Lloyd, Rhodri S.
Hughes, Michael G.
Williams, Craig A.
Lippincott, Williams & Wilkins
MetadataShow full item record
Although it is suggested that periods of naturally occurring accelerated adaptation may exist for various physical parameters, it would appear that no such evidence exists for stretch-shortening cycle (SSC) development. Two hundred and fifty male youths aged 7-17 years were tested for squat (SJ) and countermovement jump (CMJ) height, reactive strength index (RSI), and leg stiffness, with analyses of variance used to establish any significant between-group differences. Additionally, to ascertain the existence of periods of accelerated adaptation, inferences were made about the magnitudes of change between consecutive chronological age groups in relation to the smallest worthwhile change. The largest mean differences (±90% confidence limits) occurred between age groups 10 and 11 (G10-G11) for squat jump (SJ) height (21.61 ± 12.08-31.94%), CMJ height (20.80 ± 11.1-44.1%), and RSI (26.51 ± 11.07-44.10%); and between G12 and G13 for SJ (15.31 ± 7.47-23.73%) and CMJ (16.09 ± 7.50-25.38%) height. Negative mean differences occurred between G11 and G12 for SJ height (−1.32 ± −9.30 to 7.37%), CMJ jump height (−7.68 ± −15.15 to 0.45%) and RSI (−11.48 ± −22.21 to 0.74%); and between G10 and G11 for leg stiffness (−8.87 ± −18.85 to 2.34%). It would appear almost certain that windows of accelerated adaptation may exist for SJ and CMJ height and RSI in male youths; however, leg stiffness results would suggest that fast-SSC function may follow a different developmental trend. © 2011 National Strength and Conditioning Association
Journal of Strength & Conditioning Research;
Lloyd, R.S., Oliver, J.L., Hughes, M.G. and Williams, C.A. (2011) 'The influence of chronological age on periods of accelerated adaptation of stretch-shortening cycle performance in pre and postpubescent boys', The Journal of Strength & Conditioning Research, 25(7), pp.1889-1897
- Sport Research Groups 
Showing items related by title, author, subject and abstract.
What is the relationship between knee height in the leg cycle and force production during the stance phase whilst running at maximal velocity? Kinsey, Luke (Cardiff Metropolitan University, 2014)The main aim of this study was to investigate the relationship between the maximum height of the knee during the leg cycle and the peak vertical ground reaction force from the forthcoming stance phase of the same leg. ...
The effects of changing seat height upon peak power output and fatigue index when performing maximal sprints on a cycle ergometer Pugh, Chris (University of Wales Institute Cardiff, 2010)The purpose of this study was to discover if a change in seat height affects power output (PPO) and fatigue index (FI) when completing a 10s Wingate test on a cycle ergometer. A group of healthy, active male participants ...
Wyburn, Saran (Cardiff Metropolitan University, 2015)Aim: The purpose of this study was to examine the effects Kinesiology Tape (KT) has on jump height performance in male rugby players. Subjects: A group of 12 semi-professional rugby players (with mean age, weight and height ...