Analysis of Rate of Force Development, Maximal Force and Time to Maximal Force during Closed Kineti Chain Upper Extremity Stability (ckcues) Test

1 Helga Tatiana Tucci, 2 Lilian Ramiro Felicio, 3 Kevin J McQuade, 4 Debora Bevilaqua Grossi and 4 Anamaria Siriani de Oliveira 1 Ph.D, Department of Human Movement Science, Federal University of São Paulo, Santos, Brazil; 2 Ph.D, University Center Augusto Motta, Rio de Janeiro, Brazil 3 Ph.D, Department of Rehabilitation Medicine, School of Medicine, University of Washington, Seattle, USA 4 Ph.D, Department of Biomechanics, Medicine and Rehabilitation of Locomotor Apparatus, School of Medicine, University of São Paulo, Ribeirão Preto, Brazil e-mail: [email protected] SUMMARY The CKCUES Test is a functional test performed in a pushup position [1]. To date, there have been no studies evaluating any biomechanical metrics of this test. Understanding key kinetic parameters is important to evaluate the performance requirements of the test and its potential utility as a functional shoulder performance test. The objective of this study was to evaluate the rate of force development (RFD), maximal force (MF), and the time to maximal force (TMF) during the CKCUES Test. Fifteen subjects performed the test which required them to reach from hand to hand while maintaining a pushup position within a specific time period. Vertical Ground Reaction Force (VGRF) was obtained using a forceplate. Based on VGRF, RFD, TMF and MF force were calculated. Results indicate that there were no differences in the RFD, TMF and MF between analyzed touches. Thus, for this population, these kinetic variables were consistent all over the 15 seconds of test performance.