Abstract
ABSTRACT Introduction: Strength training with blood flow restriction (BFR) involves the use of low loads (20-30% of 1RM) with restriction of blood flow to promote gains in physical fitness. The restriction can be applied continuously or intermittently; however, it is unclear how it affects the hemodynamics of hypertensive women. Objective: To analyze the acute effect of resistance exercise (RE) on the upper and lower limbs with continuous and intermittent blood flow restriction (BFR) on the hemodynamic variables of women with hypertension. Methods: Thirteen women with controlled hypertension (40 to 65 years) underwent eight experimental protocols, with a randomized, counter balanced, crossover design; four exercise sessions for the right upper limb (elbow flexion) and four for the right lower limb (knee extension). The systolic arterial pressure (SAP), diastolic arterial pressure (DAP), and heart rate (HR) were measured before, during, immediately after and 15, 30, 45 and 60 minutes after the exercises. Results: There were no significant interactions between the protocols vs. segments vs. time, protocols vs. segments, protocols vs. time, segments vs. time, protocol, segment and time, on the variables SAP, DAP, and HR during and after the RE (p>0.05). Although all these protocols had significantly elevated SAP, DAP and HR, the values remained within the normal range. The protocols of this study did not cause hypotensive effect. Conclusion: Low-load RE combined with continuous and intermittent BFR, on the upper and lower limbs, appears to promote similar variations in the hemodynamic variables of women with hypertension. Level of evidence II; Randomized clinical trial.
Highlights
Strength training with blood flow restriction (BFR) involves the use of low loads (20-30% of 1RM) with restriction of blood flow to promote gains in physical fitness
A possible alternative to high load (HL) resistance exercise (RE) for this population, is the method called RE combined with blood flow restriction (BFR), which is performed with low loads (20-30% of 1-RM) and consists on the using of inflatable cuffs or elastic bands placed on the proximal portion of the exercising muscles, which has been shown to promote significant changes aerobic capacity, muscle strength and hypertrophy.[2]
No significant interactions were found between protocols × segments × time, protocols × segments, protocols × time, segments × time, protocol and segment (p>0.05)
Summary
Strength training with blood flow restriction (BFR) involves the use of low loads (20-30% of 1RM) with restriction of blood flow to promote gains in physical fitness. Objective: To analyze the acute effect of resistance exercise (RE) on the upper and lower limbs with continuous and intermittent blood flow restriction (BFR) on the hemodynamic variables of women with hypertension. Conclusion: Low-load RE combined with continuous and intermittent BFR, on the upper and lower limbs, appears to promote similar variations in the hemodynamic variables of women with hypertension. A possible alternative to high load (HL) RE for this population, is the method called RE combined with blood flow restriction (BFR), which is performed with low loads (20-30% of 1-RM) and consists on the using of inflatable cuffs or elastic bands placed on the proximal portion of the exercising muscles, which has been shown to promote significant changes aerobic capacity, muscle strength and hypertrophy.[2]. This study aimed to compare the changes promoted during RE sessions with continuous and intermittent BFR on the upper and lower limbs on hemodynamic variables in hypertensive women As mode of BFR application and limbs exercised may influence in the effects of exercise on hemodynamic variables, this can implicate a safety issue for the application of BFR specially in clinical populations such as people with hypertension.[12]
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