Force Plate Normative Data for Isometric Knee Flexor and Plantar Flexor Peak Force Capabilities of English Football League Players

This spreadsheet contains anonymised peak force and relative peak force data obtained by a force plate system for the isometric knee flexor tests performed with 30 and 90 degrees of knee flexion and the kneeling isometric plantar flexor test. The sample is professional English football league players who completed in League 2 (4th tier) or National League (5th tier) at the time of testing. All together, four football clubs participated in the testing (1 League 2 and 3 National League) to provide a combined sample of 91 players. Following a dynamic warm-up, three trials of each of these tests were performed unilaterally and with maximum-effort at the beginning of the pre-season training period (2023-24 season). The tests were performed in a randomised order with around 30-60 seconds of rest between trials and at least 3-5 minutes of rest given between tests. Only the mean value across the three trials performed are presented in this spreadsheet. The data were collected on Hawkin Dynamics force plates and analysed by their software. Here is the link to the Hawkin Dynamics metric database that explains how each metric included in the spreadsheet was measured: https://www.hawkindynamics.com/hawkin-metric-databaseEthics approval was granted from the author's institution and informed consent was provided by each player for their anonymised data to be uploaded to this repository for research use.