Tissue Oxygen Recovery Time Difference in Front and Back Squats



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Muscle oxygenation (SmO2) has been studied through near-infrared spectrometry (NIRS) to describe the change in oxygen saturation within a muscle. The MOXY sensor is an inexpensive and mobile NIRS device. The purpose of this study is twofold: first to determine if SmO2 recovers faster when comparing individual hamstring or quadricep muscles and second to determine if SmO2 recovers faster when comparing front or back squats at 70% of an individual’s measured 1-repetition maximal (1-RM) weight. Eleven recreationally trained participants completed the study. Each participant performed a 1-RM test and another test at 70% of their 1-RM for both front and back squats. Data was collected during the 70% of 1-RM test by placing MOXY sensors on the vastus lateralis and biceps femoris of the left and right legs. SmO2 recovery rate was reported as the rate constant by performing a linear regression from 10-50 seconds of each resting period. A repeated measures ANOVA was used to determine whether there were significant differences in SmO2 recovery rates. The level of significance was set at p < .05. There was a significant difference of muscle type in each of the three rest periods of both the left and right legs (Right Leg 1st rest period: F(1,9) = 5.708, p = .041, Right Leg 2nd rest period: F(1,9) = 8.781, p = .016, Right Leg 3rd rest period: F(1,9) = 9.609, p = .013) (Left Leg 1st rest period: F(1,10) = 6.466, p = .029, Left Leg 2nd rest period: F(1,10) = 5.952, p = .035, Left Leg 3rd rest period: F(1,10) = 14.754, p = .003). The quadricep muscles had a greater recovery rate mean when compared to the hamstring muscle. With the greater recovery rate in quadricep muscles, this may suggest a faster recovery due to metabolic pathways, greater blood delivery, greater capillarization, or increased muscle activation compared to the hamstring muscles during the lifts.



Front squat, back squat, hamstring, quadriceps, muscle oxygenation, recovery rate