Can muscle fatigue in women be influenced by knee extension tasks in different ranges of motion?

Purpose The present study aimed to compare the strength performance in the one-repetition maximum (1RM) test with a knee extension machine among different ranges of motion (ROMs), and to compare the force reduction after the performance of a dynamic exercise configured with different ROMs. Methods Nine women (mean ± standard deviation: age: 24.2 ± 3.5 years; height: 166.5 ± 4.1 cm; body mass: 68.35 ± 4.14 kg) with no strength training experience and no history of injury performed (cross-over design) tests of 1RM with a knee extension machine in the following ROMs: 100–65° of knee flexion (INITIALROM), 65–30° (FINALROM), and 100–30° (FULLROM) (0° = knee full extended). Further, the volunteers performed, in each ROM, 3 sets of 7 repetitions at 60% of 1RM (specific to ROM assessed) with 3-minute rests between sets with 2 seconds for concentric and eccentric phases. Before and 2 minutes after the training, the maximum torque values at 100° and 30° of knee flexion were registered to calculate the force reduction. Results The ANOVA test identified that the maximum torque pre-training values were greater than the post-training values (p = 0.02), and a greater torque reduction occurred at 30° of knee flexion than at 100° (p = 0.001). Conclusions The results suggest that ROM may influence maximum strength performance, and the force may reduce similarly along the angles.

Abstract licence: CC BY-NC-ND

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