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ORAL ABSTRACTS - THURSDAY, 21 MAY 2015test). Players’ years from peak height velocity (Y-PHV) was also calculated. Total distance (TD),distance covered above 18 km•h-1 (DS18), distance covered with accelerations or decelerationsgreater than 2.0 or 2.5 m•s-2, equivalent distance (ED) and distance with metabolic power above 23W•kg-1 (DP23) were considered as representative of high-intensity activity (HI) during a match.Results showed mainly moderate-to-small associations (0.30 < r < 0.50) of aerobic fitness variableswith match activities. When match perceived effort was considered (match intensity, RPE >5 a.u.Borg Scale, n=30) the relationships become large for TD, ED, DP23 and decelerations. foraccelerations, the relationships become large only with YoYo IR1. A moderate effect of Y-PHVwas observed on HI match variables when match RPE >5 a.u. was considered. This study showedthat in young non-elite football players aerobic fitness assessed either with maximal (Yo-Yo IR1) orsub-maximal (HIT, Mognoni’s test) field tests was mainly moderately associated with match HI.The influence of metabolic aspects seem to be more pronounced when the players’ physical abilitiesbecome more strained during a match. Estimated physical maturity had a moderate effect on matchHI in this age span.10:15 - 11:45S10 BIOMECHANICSS10.1Ball kicking dynamics in football codes: new insight for coaching cuesHiroyuki NunomeFukuoka University, Faculty of Sports and Health Science, Fukuoka, JapanMuch practical advice exists on how to kick the ball better, how to achieve coordinated kickingmotion and how to prevent injuries ragading kicking motion. Our research group has made a seriesof attempts to clarify ball kicking dynamics over several football codes. These studies havesucceeded in demonstrating several unique and unexpected results. The aims of this talk is tointroduce these studies to better develop our understanding of ball kicking motion and to shed somelight on the veracity of some practical coaching instructions currently used. On the field, coachesoften advise players to 'kick through the ball' and some coaches with a physics background mightsay 'push the ball as long as possible'. On the other hand, in the punt kick used for rugby code andAustralian rules, the coaching cue 'kick with a firm foot' is used to encourage players to make thekick foot and ankle as rigid as possible to maximise distance and decrease kick errors. Thiscoaching cue also has a theoretical support, as a firm foot might increase effective striking mass forball impact. However there has been limited evidence to support these types of instruction from abiomechanical perspective. It has been revealed that some coaching cues seem to be inaccurate,some of them warrant further invertigation and some of them like 'kick through the ball' haverecently been supported scientifically and likely work to fine tune the kicking technique.85