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Liza Plus for neuromuscular assessment and training: mobile app user guide
  1. Ezequiel Rey,
  2. Roberto Barcala-Furelos,
  3. Alexis Padron-Cabo
  1. Faculty of Education and Sport Sciences, University of Vigo, Pontevedra, Spain
  1. Correspondence to Dr Ezequiel Rey, Faculty of Education and Sport Sciences, University of Vigo, Campus Universitario s/n, Pontevedra, Pontevedra 36005, Spain; zequirey{at}uvigo.es

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Name of the mobile application

Liza Plus

Category of the mobile application

Fitness or health

Platform

Apple (iOS V.4.0 or later)

Cost

€5.99

About the app

Liza Plus is an easy-to-use application designed to conduct four common1 ,2 neuromuscular fitness tests and exercises on athletic and non-athletic populations. By using an iPhone accelerometer, Liza calculates the power and speed during exercise by measuring the vertical acceleration of the mass lifted by the subject in opposition to gravity. Liza filters the acquired accelerometer information and processes it to obtain the speed (cm/s); then Liza calculates the power (W) and other output data based on the load lifted in the specific exercise performed, similar to a linear encoder (Power=Force×Velocity, where Force=m (load lifted)×a). Users can measure performance during a workout session using a barbell (half squat, bench press) or body-weight exercises (countermovement jump (CMJ) or squat jump (SJ)) (figure 1). The free version (Liza Lite) allows one to perform only jump tests (CMJ and SJ). At the end of each test, the user can read …

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