PMID- 32668096 OWN - NLM STAT- MEDLINE DCOM- 20210413 LR - 20210413 IS - 1600-0838 (Electronic) IS - 0905-7188 (Linking) VI - 30 IP - 11 DP - 2020 Nov TI - Movement competency and measures of isometric and dynamic strength and power in boys of different maturity status. PG - 2143-2153 LID - 10.1111/sms.13773 [doi] AB - An understanding of how movement competency, strength, and power interact with natural growth and maturation is required in order to determine meaningful changes with developing athletes. Isometric and dynamic testing in youth athletes provides insight into the natural development of the force-velocity (F-V) spectrum. Two-hundred and six young male athletes, aged 9-17 years of age, were grouped according to stage of maturation based on their maturity offset which was determined as number of years from peak height velocity (PHV). All participants performed the back-squat assessment (BSA), isometric mid-thigh pull (IMTP), countermovement jump (CMJ), and squat jump (SJ) tests. Absolute and scaled force-time variables were collected from the IMTP, CMJ, and SJ. No significant differences were observed between maturational groups for squat movement competency (P > .05). One-way ANOVA with Bonferroni post-hoc analysis revealed that increasing maturity led to significant, moderate to large increases in allometrically scaled peak force (PF(allo) ) for all tests (P < .05). Multiple stepwise linear regression models revealed IMTP PF(allo) significantly predicted 34.8% and 41.3% of variance in SJ and CMJ jump height, respectively (P < .05). Natural growth and maturation induces positive adaptations to movement competency as well as isometric and dynamic strength and power. Trends from the IMTP, SJ, and CMJ tests indicate the largest differences in strength, and power may occur around the adolescent growth spurt despite the large variation in rates of change within the circa-PHV group. CI - (c) 2020 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd. FAU - Dobbs, Ian J AU - Dobbs IJ AUID- ORCID: 0000-0003-1943-0599 AD - School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK. FAU - Oliver, Jon L AU - Oliver JL AUID- ORCID: 0000-0001-7425-3148 AD - School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK. AD - Sport Performance Research Institute, New Zealand (SPRINZ), AUT University, Auckland, New Zealand. FAU - Wong, Megan A AU - Wong MA AD - School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK. FAU - Moore, Isabel S AU - Moore IS AUID- ORCID: 0000-0002-4746-3390 AD - School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK. FAU - Lloyd, Rhodri S AU - Lloyd RS AD - School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK. AD - Sport Performance Research Institute, New Zealand (SPRINZ), AUT University, Auckland, New Zealand. AD - Centre for Sport Science and Human Performance, Waikato Institute of Technology, Hamilton, New Zealand. LA - eng PT - Journal Article DEP - 20200804 PL - Denmark TA - Scand J Med Sci Sports JT - Scandinavian journal of medicine & science in sports JID - 9111504 SB - IM MH - Adolescent MH - Child MH - Cricket Sport/physiology MH - Cross-Sectional Studies MH - Exercise Test/methods MH - Humans MH - Isometric Contraction MH - Male MH - Movement/*physiology MH - Muscle Strength/*physiology MH - Plyometric Exercise MH - Regression Analysis MH - Resistance Training MH - Sexual Maturation/*physiology OTO - NOTNLM OT - countermovement OT - growth OT - jump OT - maturation OT - squat EDAT- 2020/07/16 06:00 MHDA- 2021/04/14 06:00 CRDT- 2020/07/16 06:00 PHST- 2020/04/27 00:00 [received] PHST- 2020/06/29 00:00 [revised] PHST- 2020/07/10 00:00 [accepted] PHST- 2020/07/16 06:00 [pubmed] PHST- 2021/04/14 06:00 [medline] PHST- 2020/07/16 06:00 [entrez] AID - 10.1111/sms.13773 [doi] PST - ppublish SO - Scand J Med Sci Sports. 2020 Nov;30(11):2143-2153. doi: 10.1111/sms.13773. Epub 2020 Aug 4.