The Effects of Static and Dynamic Stretching on Muscle Oxygen Saturation in the Rectus Femoris

The purpose of this study was to analyze the muscle oxygen saturation (SmO₂) of static and dynamic warm-up and assess their impact on athletic preparation. The acute effects of static and dynamic stretching on muscular and functional performance have been well established, with many studies highlighting physiological factors and performance markers (such as range of motion and flexibility). To date, no studies have analyzed the effects of dynamic stretching on muscle oxygenation. Twenty-three recreationally fit participants performed both static (SS) and dynamic stretching (DS) protocols targeting the rectus femoris muscle while the effects on SmO₂ were monitored using near-infrared spectroscopy (NIRS). SmO₂ levels after stretching were significantly (p = 0.04; d = 2.21) enhanced with DS (62.8 ± 12.6%) compared to SS (55.1 ± 17.8%). The effect persisted for two minutes after stretching had ceased, which may have implications for exercise prescription.