Fig 1.
Measurement setup for the Nordic hamstring strength (A), and maximal voluntary contraction (MVC) torque measurements with an isokinetic dynamometer (B). An example of recording of Nordic hamstring force measure with angular velocity is shown in C, in which how the peak force and break point were determined are shown. Reprint from the original image under a CC BY license, with permission from Masatoshi Nakamura and Kazuya Yoshida (February 2021).
Table 1.
Nordic hamstring peak force and peak torque, angle at peak force, break point angle, and force and torque at break point angle (mean ± SD, range of 16 participants) over three trials (Test 1 –Test 3) for intraclass correlation coefficient (ICC), standard error of measurement (SEM) and coefficient of variation (CV) with 95% confidence interval (95%CI).
Table 2.
Maximal voluntary contraction torque of the knee flexors (mean ± SD, range of 16 participants) during isometric (30°, 45°, 60°, 90° knee flexion), concentric and eccentric (angular velocity of 30°/s, 60°/s) contractions, and the angle at peak torque in the isokinetic concentric and eccentric contractions.
Fig 2.
Correlations between peak Nordic hamstring torque (A, C, E, G, I, K) or Nordic hamstring torque at break point angle (B, D, F, H, J, L) and peak torque of knee flexors in maximal voluntary isometric (30°, 60°), concentric and eccentric contractions (30°/s, 60°/s) among 16 study participants. r and p values of Pearson correlation coefficient are shown in each figure.
Fig 3.
Correlations between break point angle in Nordic hamstring and peak Nordic hamstring torque (A), peak torque in maximal voluntary isometric contraction at 30° knee flexion (B), and concentric (C) and eccentric contraction at 30°/s (D) among 16 study participants. r and p values of Pearson correlation coefficient are shown in each figure.