## 1 Introduction  
Kinematic variables, such as stride and step length (m), stride angle, step rate (s/min), vertical speed (m/s), contact time (ms), contact ratio (%), flight time (ms), and flight ratio (%), have significant correlations with performance ([PERSON] et al., 2019 [1]; [PERSON] et al., 2003 [2]; [PERSON] et al., 2014 [3]). Increasing running speed leads to reduced contact time, increased stride length, shorter stance phase, and longer flight time ([PERSON] et al., 2018 [4]; [PERSON] et al., 2021 [5]). Additionally, [PERSON] et al. (2018) [4] found increased dorsal flexion at initial contact and ankle plantar flexion during the early leg swing. Increased running speed can modify some kinematic variables in men that are also shared with women; specifically, [PERSON] et al. (2019) [6] investigated female runners at increased speeds and observed an increase in flight time, decrease in contact time and alterations in the initial contact, stance, and propulsion phases. Increased running speed and/or prolonged running over time will cause signs of fatigue. Fatigue studies in the running indicate that contact time may increase during the stance phase along with ankle, knee, and hip range of motion (angular moments) ([PERSON] et al., 2021 [7]; [PERSON] et al., 2019 [8]). However, step rate and stride length remain relatively unchanged in trained runners experiencing fatigue ([PERSON] et al., 2021 [7]), while [PERSON] et al. (2022) [9] noted a slight increase in step rate among trained runners. [PERSON] et al. (2022) [10] studied fatigue between a 5 km run and a 10 km run and observed a decline in propulsion and increased foot eversion during stance, particularly after 10 km. They also noted greater dorsal flexion at 5 km compared to 10 km and reduced plantar flexion after both distances. Increased fatigue during running causes changes in some kinematic variables in male runners, but what these changes would look like in female runners has not been described. Changes in kinematic variables due to fatigue may vary between novice and experienced runners. Novice runners exhibit increased stride width variability for performance and stability, while elite runners demonstrate shorter stride length and width ([PERSON] et al., 2022 [11]). Novices struggle with impact absorption during the stance phase, while both novice and elite runners adjust stride length to improve economy, reduce ankle stiffness, and increase knee stiffness, thereby decreasing oxygen consumption. These studies do not differentiate between men and women. Some changes in kinematic variables may be related to injury, and knowing their relationship may help prevent injury. Injury prevention research has linked increased foot pronation during running fatigue to an increased risk of injury ([PERSON] et al., 2019 [8]; [PERSON] et al., 2018 [12]). Injured runners show increased knee extension, ankle dorsiflexion, trunk tilt, contralateral pelvic drop and hip adduction during the stance phase, with contralateral pelvic drop being a significant kinematic parameter associated with injury ([PERSON] et al., 2018 [12]). Hip adduction can be an injury risk for both men and women, with women having greater hip adduction associated with specific injuries. Higher weight, longer flight time, lower stride frequency, and greater training at higher speeds also contribute to injury in female runners ([PERSON] et al., 2020 [13]). [PERSON] et al. (2021) [14] found that simultaneous knee flexion at stance and foot eversion help reduce impact and prevent injury. Runners experiencing lower limb discomfort tend to decrease stride length and increase contact time, negatively impacting the economy, increasing oxygen transport costs, and impairing impact absorption ([PERSON] et al., 2020 [15]). Increased pronation is also associated with these runners. Another kinematic parameter in male runners with lower limb discomfort shared with female runners that increases the likelihood of injury is the decreased ability to attenuate impact. [PERSON] et al.