Abstract
Near infrared spectroscopy (NIRS) can be used to measure skeletal muscle tissue oxygen (SmO2) levels, which may be a useful indicator of recovery and fatigue during resistance training. PURPOSE: The purpose of this study was to determine the SmO2 recovery rate in both the Vastus Lateralis (VL) and Biceps Femoris (BF) muscles in traditional back squats and front squats. METHODS: Eleven recreationally resistance trained participants completed the study. The 1-repetition maximum (1-RM) was determined for the front and back squats on two different occasions. In subsequent visits a wireless NIRS device was applied over the VL and BF on each leg. Participants completed 3 sets of 15 repetitions with 2-3 minutes of recovery using 70% of their 1-RM weight. During recovery, participants sat on a bench next to the squat rack. To complete the study, participants would repeat the above procedures for the other squat form (front or back) with at least 48 hours in-between visits. Repeated measures ANOVA was used to determine differences in the recovery rate. RESULTS: The recovery rate of SmO2 (%SmO2/0.5 sec) was calculated as the slope of SmO2 over time between 10-50 seconds of during each recovery period. The mean recovery rate during the third set recovery for VL in back squats was 0.885 ± 0.194 %SmO2/0.5 sec and 0.785 ± 0.129 %SmO2/0.5 sec in front squats. Mean recovery rate for third set recovery for BF in back squats was 0.449 ± 0.083 %SmO2/0.5 sec and 0.290 ± 0.059 %SmO2/0.5 sec in front squats. There were significant differences in the SmO2 recovery rates between the BF and VL in both legs (p<0.05). There were no significant differences between the recovery rates in back vs front squats. Similar differences were found in the first and second set recovery periods. CONCLUSION: During front and back squats the initial rate of recovery of SmO2 is more rapid in the VL than in the BF. Additionally, there are no differences in SmO2 recovery rate between front and back squats.
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