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EXAMINATION OF ACUTE MUSCLE AND CARDIOVASCULAR RESPONSES FOLLOWING LOW-PRESSURE BLOOD FLOW RESTRICTION EXERCISE USING TWO DISTINCT METHODS OF APPLYING PRESSURE

Abstract

PURPOSE: To examine acute changes in muscle thickness (MT), isometric strength (ISO), and blood pressure (BP), following exercise with 40% limb occlusion pressure (LOP) using two distinct blood flow restriction (BFR) devices. METHODS: Forty-four trained individuals had each arm randomized to perform exercise with either a SmartCuffs or Hokanson BFR device. Each condition performed 4 sets to volitional muscular failure at 30% of individual’s one repetition-maximum (1RM) with 30s rest periods. For both conditions, LOP was set at 40%. Blood pressure, MT, and ISO were measured before and after exercise. RESULTS: For MT, there was no condition x time interaction (p = 0.68), or main effect for condition (p = 0.50), however, there was a main effect for time (p < 0.001). When examining changes, MT increased from pre (3.8 +/- .67 cm) to post (4.3 +/- .72 cm). For ISO, there was no condition x time interaction (p = 0.53), or main effect for condition (p = 0.50). However, there was a main effect for time (p < 0.001). When examining changes, ISO decreased from pre (23.7 +/- 8.5 AU) to post (13.2 +/- 5.6 AU). For systolic BP, there was no condition x time interaction (p = 0.1), or main effect for condition (p = 0.52). However, there was a main effect for time (p < 0.001). Systolic BP increased from pre (122 +/- 12 mmHg) to post (136 +/- 19 mmHg). For diastolic BP, there was no condition x time interaction (p = 0.56), or main effect for condition (p = 0.44). However, there was a main effect for time (p < 0.001). Diastolic BP increased from pre (72 +/- 9 mmHg) to post (78 +/- 13 mmHg). CONCLUSIONS: In conclusion, we observed significant increases in MT and BP, as well as significant decreases in ISO following exercise, with no differences between the exercise conditions. Our data would suggest that both methods of applying BFR seem to provide similar acute muscular and cardiovascular responses following BFR exercise with 40% LOP.

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