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Understanding the changes in running mechanics caused by fatigue is essential to assess its impact on athletic performance. Changes in running biomechanics after constant speed conditions are well documented, but the adaptive responses after a maximal incremental test are unknown. We compared the spatiotemporal, joint kinematics, elastic mechanism, and external work parameters before and after a maximal incremental treadmill test. Eighteen recreational runners performed 2-minute runs at 8 km·h−1 before and after a maximal incremental test on a treadmill. Kinematics, elastic parameters, and external work were determined using the OpenCap and OpenSim software. We did not find differences in spatiotemporal parameters and elastic parameters (mechanical work, ankle, and knee motion range) between premaximal and postmaximal test conditions. After the maximal test, the runners flexed their hips more at contact time (19.4°–20.6°, P = .013) and presented a larger range of pelvis rotation at the frontal plane (10.3°–11.4°, P = .002). The fatigue applied in the test directly affects pelvic movements; however, it does not change the lower limb motion or the spatiotemporal and mechanical work parameters in recreational runners. A larger frontal plane motion of the pelvis deserves attention due to biomechanical risk factors associated with injuries.
Borba https://orcid.org/0000-0002-9399-1098
Silva https://orcid.org/0000-0001-9169-5992
Alves https://orcid.org/0000-0003-1041-1033
Neto https://orcid.org/0009-0008-1826-9629
Inda https://orcid.org/0009-0008-7458-9117
Ibrahim https://orcid.org/0009-0007-2126-7897
Ribas https://orcid.org/0009-0007-6871-2871
Correale https://orcid.org/0000-0003-0452-4015
Tartaruga https://orcid.org/0000-0003-1173-2816
Peyré-Tartaruga (leonardo.tartaruga@ufrgs.br) is corresponding author, https://orcid.org/0000-0003-1742-5016