# Blood Flow Restriction Training Improves Cardiac Structure and Diastolic Function in Runners with Exercise-Induced Hypertension

## TL;DR

Blood flow restriction training helps runners with high exercise blood pressure by improving heart structure and function.

## Contribution

This study shows BFR training reduces cardiac hypertrophy and improves diastolic function in runners with EIH.

## Key findings

- BFR training lowered maximal exercise systolic blood pressure and increased exercise duration and VO2max.
- Echocardiography showed reduced septal thickness and improved diastolic function in the BFR group.
- Systolic function remained unchanged, but diastolic indices improved significantly.

## Abstract

Background/Objectives: Exercise-induced hypertension (EIH) in runners predisposes them to cardiovascular diseases, including myocardial hypertrophy, arrhythmias, and coronary artery disease. Blood flow restriction (BFR) training has been reported to exert non-pharmacological benefits in runners with EIH by improving blood pressure, myocardial workload, and cardiorespiratory fitness. The purpose of this study was to investigate whether changes in myocardial structure and function accompany these effects of BFR training in middle-aged runners with EIH. Methods: Participants who exhibited a maximal systolic blood pressure of ≥210 mmHg during an exercise stress test were assigned either to a BFR training group (BFRTg, n = 15) or to a control group without BFR training (non-BFRTg, n = 14). The BFRTg underwent a two-month BFR training program, performed twice per week for 20 min per session. Cardiac structure and function were evaluated before and after the intervention, and exercise stress test data were obtained from secondary sources of a previous study. Results: Compared with controls, the BFR group showed lower maximal exercise SBP, longer exercise duration, and higher VO2max. Echocardiography revealed reduced interventricular septal thickness and improved diastolic indices (higher E′/A′, lower E/E′), while systolic function remained unchanged. Conclusions: In conclusion, reductions in septal thickness and improvements in diastolic function induced by blood flow restriction training in runners with exercise-induced hypertension suggest a favorable cardiac adaptation, accompanied by concurrent improvements in exercise blood pressure and cardiorespiratory fitness.