We studied age-related changes in the performance of maximal and accurate submaximal force moment production tasks. Elderly young subjects pressed on six dimensional sensors affixed to a handle with T-shaped attachment. The weight whole system was counterbalanced another load. During tasks that required or by all digits, were stronger than elderly. A greater deficit seen tests. tests, elderly showed larger relative involvement index middle fingers; they moved point thumb application upward...

Experimental laboratory study supplemented with a repeated case study.To examine bilateral muscle activity of the deep abdominals in response to rapid arm raising, specifically laterality and directional specificity feedforward responses transversus abdominis (TrA).Based on trunk muscles during movements, authors have concluded that different control mechanisms compared more superficial muscles. It has been proposed such as TrA contribute substantially stability lumbar spine this is achieved...

Evasive sidestepping during sports commonly results in noncontact anterior cruciate ligament injuries. Sidestepping response to different simple visual stimuli has been studied previously but never investigated using quasi-game-realistic conditions. We compared the biomechanics of high-level and low-level soccer players when projected, three-dimensional defender(s) traditionally used planned unplanned arrow stimuli.A motion analysis system captured trunk lower limb kinematics ground reaction...

Enhancing the understanding of coordination and variability in tennis serve may be interest to coaches as they work with players improve performance. The current study examined coordinated joint rotations lower limbs, trunk, serving arm ball location elite female serve. Pre-pubescent, pubescent adult performed maximal effort flat serves while a 22-camera 500 Hz motion analysis system captured three-dimensional body kinematics. Coordinated limbs trunk appeared most consistent at time left...

This study examined whether ground reaction force (GRF) asymmetry of 2-legged countermovement jumps (CMJ) is related to 1-legged CMJ asymmetry. The GRF a has been suggested as preferred test the for functional strength and power deficit assessment. Twenty-eight men 30 women performed 5 trials each with right limband left limb, CMJ. Vertical GRFs were collected from lower limb using 2 platforms. Although several variables calculated, vertical impulse correlated most strongly jump height in...

The importance of the flat serve in tennis is well documented, with an abundance research evaluating service technique adult male players. Comparatively, female and junior serves have received far less attention. Therefore, aims this study were to quantify kinematics elite prepubescent, pubescent, postpubescent Full body, racket, ball derived using a 22-camera Vicon motion capture system. Racket velocity was significantly lower prepubescent group than two older groups. In generating racket...

Surfing is a balance-reliant, open skill performed in dynamic environment rich visual, somatosensory and vestibular information.To evaluate adaptations to the postural control system by surfing experience.Postural was assessed an upright bipedal stance 60 male volunteers (21 elite surfers, 20 intermediate level 19 controls) using various closed-stance positions. Six tasks were with two trials including cognitive task, following order: eyes open, head neutral position (EO1); closed, (EC);...

Purpose: To study the validity of a video-based reactive agility test in Australian footballers. Methods: 15 higher performance, lower and 12 nonfootballers completed light-based (LRAT), (VRAT), planned (PLAN). Results: With skill groups pooled, time PLAN (1346 ± 66 ms) was significantly faster ( P = .001) than both tests (VRAT 1550 102 ms; LRAT 1572 97 ms). In addition, decision .001; d 0.8) (278 36 VRAT (311 47 The correlation between two r .75) .41–.68). Higher performance players had...

This study evaluated a video-based testing protocol to assess perceptual and decision-making skill in Australian football. Whether umpires from two disparate levels of expertise could be discriminated on sportspecific decision making task was trialled. In addition, any task-specific differences between football umpires' current players' perception the same game-play information were investigated. National league umpires, state national players viewed video projected sequences across three...

Two commonly proposed mechanical explanations for the walk-to-run transition (WRT) include prevention of muscular over-exertion (effort) and minimization peak musculoskeletal loads thus injury risk. The purpose this study was to address these hypotheses at a joint level by analysing effect speed on discrete lower-limb kinetic parameters in humans across wide range walking running speeds including above below WRT speed. Joint work, instantaneous power, moments sagittal frontal plane ankle,...

Henry, GJ, Dawson, B, Lay, BS, and Young, WB. Relationships between reactive agility movement time unilateral vertical, horizontal, lateral jumps. J Strength Cond Res 30(9): 2514-2521, 2016-This study compared (vertical, lateral) jump performance kinetics dominant nondominant legs in Australian rules footballers (n = 31) to investigate the role of leg strength characteristics performance. Jumps involved jumping forward on 1 leg, then for maximum height or horizontal distance. Agility...

This study compared reactive agility between higher-standard (n = 14) and lower-standard Australian footballers using a test incorporating life-size video image of another player changing direction, including excluding feint. Mean time in the feint trials was 34% (509 ± 243 ms; p < 0.001; effect size 3.06) longer than non-feint trials. In players, shorter for players both (114 140 0.18; 0.52; likely beneficial) (32 44 0.22; 0.47; possibly Additionally, inclusion resulted movement increasing...

Sidestepping in response to unplanned stimuli is a high‐risk maneuver for anterior cruciate ligament ( ACL ) injuries. Yet, differences body reorientation strategies between high‐ and low‐level soccer players prior sidestepping quasi‐game‐realistic vs non‐game‐realistic stimuli, remain unknown. Fifteen high‐level (semi‐professional) 15 (amateur) responded one‐defender scenario (1 DS two‐defender (2 ), arrow‐planned condition AP arrow‐unplanned AUNP ). The , 1 2 represented increasing time...

This study investigated the effects of menthol swilling and crushed ice ingestion on cognitive function, total mood disturbance (TMD), time to fatigue (TTF). Twelve male long‐distance runners completed three counterbalanced running trials (3 × 30 minutes at 65% VO 2peak a TTF run 100% ) in hot, humid conditions (35.3 ± 0.3°C, 59.2 2.5% relative humidity). Trials consisted precooling with mid‐cooling by (MIX), water (MENTH), control (CON). Swilling either 25 mL solution or placebo occurred...