Interrater and Intrarater Reliability of the EasyForce Dynamometer for Assessment of Maximal Shoulder, Knee and Hip Strength
Authors/Creators
- 1. Faculty of Sport and Physical Education, University of Nis, 18000 Nis, Serbia
- 2. Faculty of Health Sciences, University of Primorska, 6310 Izola, Slovenia and Andrej Marušić Institute, University of Primorska, 6000 Koper, Slovenia
- 3. Faculty of Health Sciences, University of Primorska, 6310 Izola, Slovenia and Human Health Department, InnoRenew CoE, 6310 Izola, Slovenia
- 4. Faculty of Health Sciences, University of Primorska, 6310 Izola, Slovenia ; Andrej Marušić Institute, University of Primorska, 6000 Koper, Slovenia ; Human Health Department, InnoRenew CoE, 6310 Izola, Slovenia and Laboratory for Motor Control and Motor Behavior, S2P, Science to Practice, Ltd., 1000 Ljubljana, Slovenia
Description
This study aimed to determine the interrater and intrarater reliability of EasyForce dynamometer for assessing shoulder, knee, and hip muscle strength in healthy young adults. Shoulder, knee, and hip maximal isometric strength were measured using the EasyForce in healthy adults (11 women and 12 men). Three repetitions of shoulder internal rotation, abduction, knee flexion, extension, and hip abduction and adduction were performed. The tests were performed by three raters on the same day. The results showed good to high inter- and intrarater reliability (intraclass correlation coefficient range: 0.63–0.91). Moreover, the absolute reliability of the EasyForce was slightly higher than acceptable for all tests (CV > 10%) except for hip abduction on the right leg (CV = 7.2%). The EasyForce dynamometer can be considered a reliable tool for assessing shoulder internal rotation and abduction, knee extension and flexion, as well as hip abduction and adduction strength. The EasyForce dynamometer showed no differences between the raters’ measurements, which could be of great importance for professionals who want to perform the tests regardless of their strength on the values.