Biomechanical Movement Analysis of a ballet Pirouette 1.Break the skill or movement into distinct phases to assist in explanation and discussion: preparation, action, landing/finish. 2. Anatomical and mechanical analysis (see outline below)Information regarding bones, joints, movements, planes, axes, movement type, kinesthetic awareness, etc. 3. Identify, evaluate, and provide information regarding critical features or correction of any faults observed within each movement phase. 4. Identify and include appropriate mechanical concepts within each phase. In other words, use the mechanical principles to explain why or how a critical feature is necessary. The following outline gives some basic components that are necessary for analysis of a motor skill to get you started: A. Description of the motor skill performance 1. Primary purpose of skill 2. Movement phases (preparation, action, landing/finish) 3. Classification of the skill ? Classification of movement patterns and skills provides further clues as to the nature of both the anatomical and mechanical requirements of a particular group of skills. The following System for Classification of Motor Skills takes into account the objective of the skill, the medium in which the skill occurs, and the nature of motion, which may also assist in your analysis: B. Anatomical analysis this should be an overview of major articulations involved Joint actions and segment motions 5. Muscle participation and form of contraction (concentric, eccentric, isometric) 6. Neuromuscular considerations (mechanoreceptors, stretch shortening cycle) 7. Anatomical principles related to effective and safe performance 8. Avoidance of injury C. Mechanical analysis This section is CRITICAL!!! ? Must understand if the motion is angular, linear, or general motion first. A. Pushing and pulling forces, weight and resistance, twisting and turning forces must be identified and their effects noted. 1. Mechanical principles that apply ? The identification of the mechanical principles related to the execution of the skill is a first step in establishing the causes of error in the performance of the skill. Focusing on these principles and how they relate to the skill suggests the potential sources of error. Each movement phase must be considered in turn for quality. A. Considerations of: I. Speed of movement II. Forces involved with movement III. Balance IV. Direction V. Timing B. If projecting an object is involved: I. Extension at release (or contact) II. Path of object III. Spin IV. Angle of release (or impact) 2. Violation of principles if detecting errors or comparing technique (Quantitative and Qualitative) a.Which application(s) of mechanical principles is (are) violated? b.What are the errors? c.What are the sources of errors? D. Prescriptions for improvement of performance
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