Counter Movement Jump Height Analysis Based on Inertial Recordings Tutorial

This page is meant to serve as a supplement to Rantalainen et al Jump height from inertial recordings: A tutorial for a sports scientist. https://doi.org/10.1111/sms.13546. Download the supplementary materials from here, and unzip to a folder of your choice. The video tutorials refer to this folder. Scripts S01 to S05 should work with Octave (which is an open source program that provides some of the functionality Matlab does).

The appendix covering the formulation of the jump height calculations is also available from here

N.B. in case your Java virtual machine runs out of memory (you will know if this happens as Octave/Matlab will give you an error saying as much), google will provide instructions (e.g. 'matlab increase java heap' or 'octave increase java heap').

This page covers the following aspects of the analysis.

  1. Sensor orientation correction
  2. Data visualisation
  3. Jump detection
  4. Jump height analysis
  5. Manual rejection of unsuccessful analyses
  6. Producing the results reported in the manuscript
  7. Sample of recording jump height with a smart-phone
  8. Pitfalls

1. Sensor orientation correction

Accelerations need to be represented in the global coordinate system.

2. Data visualisation

Data needs to be explored to decide on a strategy to identify the interesting epochs.

3. Jump detection

The algorithm developed for interesting epoch detection needs to be tested.

4. Jump height analysis

Refining the selection of interesting epochs, and actual flight time and jump height analysis.

5. Manual rejection of unsuccessful analyses

Due to false positive interesting epoch (jump) detection, and possible issues in analysis, the unsuccessful trials need to be manually removed.

6. Producing the results reported in the manuscript

Execute the S05 script prior to moving on to this video, N.B. from this script onwards things will not work with Octave. The produces depicted in the video produce the summaries reported in the manuscript.

7. Sample of recording jump height with a smart-phone

Application of the scripts to data sampled with an Android smart-phone. This is included with the hope of providing a convenient way to start testing the scripts with data you have sampled.

8. Pitfalls

Some pitfalls to keep in mind when designing your experiments.