Precise instruction and consideration of the vertical and horizontal force component increases validity and reliability of the 90:20 Isometric Posterior Chain Test

• Dominic Michael Rasp ,

  Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Software, Validation, Visualization, Writing – original draft

  * E-mail: dominic.rasp@tum.de

  Affiliation Biomechanics in Sports, Technical University of Munich, Munich, Bavaria, Germany

  https://orcid.org/0009-0003-8442-0044

  ⨯
• Florian Kurt Paternoster,

  Roles Conceptualization, Formal analysis, Methodology, Writing – review & editing

  Affiliation Biomechanics in Sports, Technical University of Munich, Munich, Bavaria, Germany

  https://orcid.org/0000-0001-8416-9820

  ⨯
• Jan Kern,

  Roles Conceptualization, Investigation, Methodology, Writing – review & editing

  Affiliation Human Movement Science, Technical University of Munich, Munich, Bavaria, Germany

  ⨯
• Ansgar Schwirtz

  Roles Conceptualization, Formal analysis, Resources, Supervision, Writing – review & editing

  Affiliation Biomechanics in Sports, Technical University of Munich, Munich, Bavaria, Germany

  ⨯