Tissue Oxygen Recovery Time Difference in Front and Back Squats
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Abstract
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.