The influence of lower body compression clothing on markers of running economy during submaximal treadmill running
The benefit of wearing lower-body compression clothing for individuals experiencing circulatory disorders has been well documented, yet little is known about benefits of wearing such clothing during endurance exercise. This was an investigation of the influence of lower-body compression clothing (stockings and shorts) on markers of running economy. METHODS: Eleven endurance runners (Mean±SD: 33±7 yrs, 67.9±15.5 kg) completed treadmill tests on three separate lab visits. First, subjects performed a running test to volitional exhaustion to measure maximal oxygen uptake (VO 2MAX) and heart rate at lactate threshold (HR LT). During the next visit, subjects ran for 90-mins at a speed that elicited 85% of HR LT (Mean±SD: 6.9±0.6 miles/hr for men and 6.7±0.5 miles/hr for women) while wearing one of two lower-body clothing conditions: compression shorts and stockings or running shorts. Subjects ran 90-mins again for the last visit at the same speed wearing the second clothing condition, the order of which was counterbalanced. During the 90-min runs, measures of oxygen uptake (VO 2), heart rate (HR), left-thigh accelerometry (AC), and blood pressure (BP) were summarized at the sixth minute of each successive 10-min time interval (T1-T9). Blood lactate (LA) was measured at the end of each time interval. Blood samples were also collected pre- and 24-hrs post-test to measure blood creatine-kinase (CK), an indicator of muscle damage. Values of VO 2 and HR were also summarized as the change for each subject from their T1 values (DeltaVO 2 and DeltaHR, respectively). Dependent variables were evaluated using a multivariate 2-factor repeated measures ANOVA with planned contrasts for post-hoc analyses. Comparisons were performed at the 0.05 alpha-level. RESULTS: Measures of VO 2, HR, BP, DeltaVO 2, DeltaHR, and CK were statistically similar at each time interval between conditions (P>0.05). Conversely, AC was significantly lower when wearing compression clothing during all time intervals (P<0.05). Measures of LA were significantly higher at T6 when wearing compression clothing (P<0.05). CONCLUSIONS: While wearing compression clothing, subjects experienced less movement of the thigh musculature (i.e., less AC), but no improvements in economy (i.e., lower VO 2 or DeltaVO 2) were observed. These results do not indicate any advantage to wearing lower-body compression clothing during endurance exercise.