ACS Applied Computer Science

  • Increase font size
  • Default font size
  • Decrease font size



Supervised learning as a sub-discipline of machine learning enables the recognition of correlations between input variables (features) and associated outputs (classes) and the application of these to previously unknown data sets. In addition to typical areas of application such as speech and image recognition, fields of applications are also being developed in the sports and fitness sector. The purpose of this work is to implement a workflow for the automated recognition of sports exercises in the Matlab® program¬ming environment and to carry out a comparison of different model structures. First, the acquisition of the sensor signals provided in the local network and their processing is implemented. Realised functionalities include the interpolation of lossy time series, the labelling of the activity intervals performed and, in part, the generation of sliding windows with statistical parameters. The preprocessed data are used for the training of classifiers and artificial neural networks (ANN). These are iteratively optimised in their corresponding hyper parameters for the data structure to be learned. The most reliable models are finally trained with an increased data set, validated and compared with regard to the achieved performance. In addition to the usual evaluation metrics such as F1 score and accuracy, the temporal behaviour of the assignments is also displayed graphically, allowing statements to be made about potential causes of incorrect assignments. In this context, especially the transition areas between the classes are detected as erroneous assignments as well as exercises with insufficient or clearly deviating execution. The best overall accuracy achieved with ANN and the increased dataset was 93.7 %.

  • APA 7th style
Krutz, P., Rehm, M., Schlegel, H., & Dix, M. (2023). Recognition of sports exercises using inertial sensor technology. Applied Computer Science, 19(1), 152-163.
  • Chicago style
Krutz, Pascal, Matthias Rehm, Holger Schlegel, and Martin Dix. "Recognition of sports exercises using inertial sensor technology." Applied Computer Science 19, no. 1 (2023): 152-163. 
  • IEEE style
P. Krutz, M. Rehm, H. Schlegel, and M. Dix, "Recognition of sports exercises using inertial sensor technology," Applied Computer Science, vol. 19, no. 1, pp.152-163, 2023, doi: 10.35784/acs-2023-10.
  • Vancouver style
Krutz P, Rehm M, Schlegel H, Dix M. Recognition of sports exercises using inertial sensor technology. Applied Computer Science. 2023;19(1):152-163.