1 / 23

Chapter 2

Chapter 2. …Measurement. Why measure?. Without measurement, how can you reliably assess progress in… Learning? Recovery? …or even assess current performance strengths and weaknesses? Idea behind this bit is to introduce some assessment methods used in motor learning and performance.

mort
Download Presentation

Chapter 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Chapter 2 …Measurement

  2. Why measure? • Without measurement, how can you reliably assess progress in… • Learning? • Recovery? • …or even assess current performance strengths and weaknesses? • Idea behind this bit is to introduce some assessment methods used in motor learning and performance

  3. Two measures of performance • Performance outcome measures • FG%; QB rating; Time for 40m dash • Result only – do not indicate movement used to achieve the result • Performance production measures • Joint angle changes, position-time graphs, EMG traces • Focus on descriptors of the movement used to achieve the result • See table 3.1, p. 24

  4. Performance outcome measures • Reaction time • Time from presentation (“onset”) of stimulus to the start (“initiation”) of the movement • Initiation refers to observed or measured physical movement, and is usually particular to the measurement device • Example: • 100m sprint

  5. Warning signal “Go” signal Initiation of response Termination of response Reaction time Movement time Response time Performance outcome measures • Reaction time Fore period Time

  6. Performance outcome measures • Reaction time (RT) • 1 signal, 1 action: simple RT • More than 1 signal, more than one action: choice RT • More than 1 signal, only one requiring a response: discrimination RT

  7. Performance outcome measures • Reaction time (RT) • Fractionated (with EMG): • Pre-motor Time: Perceptual & cognitive processes • Motor Time: Muscle vs. inertia

  8. Performance outcome measures • Error Scores • Who is best? A. B. C.

  9. Accuracy Bias Consistency Performance outcome measures • Error Scores • Who is best? • Depends on whether you’re talking about

  10. Thrower Throw attempts Target line Performance outcome measures • Error Scores – 1-dimensional versions • Accuracy – absolute error (AE) • Average of positive deviations from the target So AE = the average length of these lines

  11. Thrower Throw attempts Target line Performance outcome measures • Error Scores – 1-dimensional versions • Bias – constant error (CE) • Average deviation (+/- both count) So CE = average position – either a “bit” short or a “bit” long

  12. Thrower Throw attempts Target line Performance outcome measures • Error Scores – 1-dimensional versions • Consistency – variable error (VE) • Grouping - how close are throws to each other? So VE = clustering

  13. Accuracy Bias Consistency Performance outcome measures • Error Scores – 2-dimensional versions • Radial error & others • Same general thing, but computationally more tricky – similar concepts of bias, consistency, and accuracy

  14. Target line Path taken Performance outcome measures • Error Scores – continuous skills • Root-mean-square-error (RMSE) • Like a longer version of AE The RMSE is roughly the average length of all the vertical lines

  15. Performance production measures • Kinematics 3-d reconstruction of joint angles

  16. Performance production measures • Kinematics Position-time plot

  17. Performance production measures • http://www.usc.edu/dept/LAS/kinesiology/exsc408l/powerpoint/sldaniela/complete/sld001.htm

  18. Performance production measures • http://www.usc.edu/dept/LAS/kinesiology/exsc408l/powerpoint/sldaniela/complete/sld001.htm Velocity-time chart

  19. Performance production measures • http://www.usc.edu/dept/LAS/kinesiology/exsc408l/powerpoint/sldaniela/complete/sld001.htm Angle-angle diagram

  20. Performance production measures • Our diagrams – both for a free throw at basketball

  21. Elbow Knee Performance production measures Extension 1 8 6 3 7 4 5 Knee 2 Flexion Flexion Elbow Extension

  22. Ball release Finish Position-time plot Start Angle-angle diagram

  23. Summing up… • Go over those last few slides enough times to allow yourself to “get it”…if you still don’t, then try mapping out a few movements yourself, or move on to the online discussion. • OK?

More Related