Answer:
Explanation:
Forehand groundstroke effectiveness is important for tennis success. Ball topspin angular velocity (TAV) and accuracy are important for fore hand groundstroke effectiveness, and have been extensively studied, previously; despite previous, quality studies, it was unclear whether certain racquet kinematics relate to ball TAV and shot accuracy during the forehand groundstroke. This study evaluated potential relationships between (1) ball TAV and (2) forehand accuracy, and five measures of racquet kinematics: racquet head impact angle (i.e., closed or open face), horizontal and vertical racquet head velocity before impact, racquet head trajectory (resultant velocity direction, relative to horizontal) before impact, and hitting zone length (quasi-linear displacement, immediately before and after impact). Thirteen collegiate-level tennis players hit forehand groundstrokes in a biomechanics laboratory, where racquet kinematics and ball TAV were measured, and on a tennis court, to assess accuracy. Correlational statistics were used to evaluate potential relationships between racquet kinematics, and ball TAV (mixed model) and forehand accuracy (between-subjects model; α = 0.05). We observed an average (1) racquet head impact angle, (2) racquet head trajectory before impact, relative to horizontal, (3) racquet head horizontal velocity before impact, (4) racquet head vertical velocity before impact, and (5) hitting zone length of 80.4 ± 3.6˚, 18.6 ± 4.3˚, 15.4 ± 1.4 m·s-1, 6.6 ± 2.2 m·s-1, and 79.8 ± 8.6 mm, respectively; and an average ball TAV of 969 ± 375 revolutions per minute. Only racquet head impact angle and racquet head vertical velocity, before impact, significantly correlated with ball TAV (p < 0.01). None of the observed racquet kinematics significantly correlated to the measures of forehand accuracy. These results confirmed mechanical logic and indicate that increased ball TAV is associated with a more closed racquet head impact angle (ranging from 70 to 85˚, relative to the ground) and increased racquet head vertical velocity before impact.
Registration is the list of the names of people who are qualified to work in a specific career.
Registration procedure means any registration procedure required by law by virtue of which a Corporation shall register or obtain a license or a permit in order to carry on business in a province, in a territory, in another state or in another country or political subdivision thereof.
The career is an individual's metaphorical "journey" through learning, work and other aspects of life. There are a number of ways to define a career and the term is used in a variety of ways.
A career refers to an individual’s chosen profession or occupation. Your career can include one or many jobs throughout your lifetime and the actions, decisions, and paths you take to develop in your profession. A career usually uses your skills and talents while providing personal fulfilment and a sense of purpose.
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Answer:
In sexually reproducing organisms, each parent contributes half of the genes acquired (at random) by the offspring. Individuals have two of each chromosome and hence two alleles of each gene, one acquired from each parent.
Explanation:
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Answer:
Body movement can be expressive and communicative. It can be used as a means of self-expression where words are not necessary – the body does all the talking! Dance can help to tell a story and convey emotions, thoughts, and feelings ultimately helping dancers to communicate in a way that is meaningful to them.
Explanation:
dance, at its essence, is about expressing the deep, guttural emotionality that gets right to the very core of us. In dance, our purpose is to express emotions, communicating physically, allowing those feelings to move through the body, out of the body, and in doing so, to move others.
Answer:
You want to look at the patient, assess the situation and try to see what you need to do first. You want to assess the situation first and see what the worst injury is and try to fix that first. Check the head, chest and back before you do anything else to check for severe injuries.
