Vásquez Bonilla, AldoCruz Fuentes, ImmanuelUgalde Ramírez, Jose AlexisTrejos Montoya, José AndrésRojas Valverde, DanielClemente Suárez, Vicente JavierYáñez Sepúlveda, Rodrigo2026-08-062026-08-062025Vasquez-Bonilla, A. A., Cruz-Fuentes, I., Ugalde-Ramírez, J. A., Trejos-Montoya, J. A., Rojas-Valverde, D., Clemente-Suárez, V. J., & Yañez-Sepulveda, R. (2025). Muscle oxygen saturation and cutting movements in Women’s Futsal. Apunts Sports Medicine, 100505. https://doi.org/10.1016/j.apunsm.2025.1005052666-5069https://hdl.handle.net/11268/17360The evaluation of muscle oxygen saturation (SmO2) using non-invasive near-infrared spectroscopy (NIRS) technology has been developed in sports performance settings, though few studies have utilized it for injury prevention. This study aimed to assess and correlate bilateral SmO₂ with injury risk during a repeated sprint ability test with change of direction (RSA-COD), using the Cutting Movement Assessment Score (CMAS). Fourteen female futsal players (age 22.5 ± 4.6 years) participated. The RSA-COD consisted of eight 25-meter sprints with COD at 15 m and 3 m, with speed (m⋅s 2) recorded. Additionally, shot accuracy was evaluated using a goalscoring point system. Knee injury risk was assessed using the CMAS, while NIRS sensors were placed bilaterally on the gastrocnemius muscles of the dominant (DL) and non-dominant (non-DL) legs during the RSA-COD. Bilateral differences were found in SmO₂ data, muscle oxygen extraction (▽%SmO₂), and total hemoglobin (tHb). Additionally, three players (21.4%) showed a high risk of injury, while 10 players (71.4%) had a medium risk at 15 m. At 3 m, three players (21.4%) had a high risk, and six players (42.8%) had a medium risk. The results indicated that ▽%SmO₂ is associated with a higher risk of injury (r= -0.48, p = 0.041) in the CMAS test. Therefore, exploratory study suggests that bilateral differences in SmO2 data may be related to injury risk. Future studies should consider using two NIRS-sensors to detect potential metabolic imbalances between limbs.engAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Fatiga MuscularTraumatismos de la RodillaFútboljournal article10.1016/j.apunsm.2025.100505open accessFisiología humanaMedicina deportivaMujerGoal 3: Ensure healthy lives and promote well-being for all at all ages