Key result
High-intensity isometric exercise reduces baPWV more than low-intensity exercise while both improve FMD.
Why the study?
The influence of isometric exercise intensity on acute cardiovascular function during lower-limb isometric exercise in men with elevated blood pressure remains unclear.
Does volume-matched high-intensity isometric exercise improve vascular function and autonomic regulation more than low-intensity exercise in men with elevated blood pressure?
RCT (n=17)
Randomized crossover
Does volume-matched high-intensity isometric exercise improve vascular function and autonomic regulation more than low-intensity exercise in men with elevated blood pressure?
High-intensity isometric exercise provides a stronger physiological stimulus associated with vascular adaptation than low-intensity exercise in men with elevated blood pressure, despite no acute blood pressure reduction.
Acute exercise improves vascular markers independent of BP; extends evidence for high-intensity protocols in elevated BP.
Isometric exercise (IE) has been introduced as an effective non-pharmacological strategy for blood pressure (BP) management; however, the influence of exercise intensity remains unclear during lower-limb IE. This study investigated the acute effects of volume-matched high-intensity (HIIE) and low-intensity IE (LIIE) on cardiovascular function in men with elevated BP. Seventeen men with prehypertension or stage I hypertension completed three randomized crossover conditions, including HIIE (60% of maximal voluntary contraction (MVC)), LIIE (30% of MVC), and a non-exercise control condition (CON). BP, heart rate variability (HRV), brachial-ankle pulse wave velocity (baPWV) were measured at baseline and three different time points during recovery, while flow-mediated dilation (FMD) was measured at baseline and 30-min post-exercise. No significant BP reduction was observed. However, HIIE induced greater autonomic disturbance with elevated heart rate and reduced HRV indices during recovery (p < 0.05). Right baPWV decreased following HIIE (p < 0.05) while FMD increased after both exercise conditions (p < 0.001). Our findings suggest that volume-matched HIIE induces greater acute autonomic and vascular responses than LIIE in men with elevated BP, despite no immediate changes in BP. HIIE may provide a stronger physiological stimulus associated with vascular adaptation.
No takes yet. Share an insight, caveat, or question.
Jeong et al. (2026) conducted an RCT in Elevated blood pressure (prehypertension or stage I hypertension) (n=17). High-intensity isometric exercise (HIIE) and low-intensity isometric exercise (LIIE) vs. Non-exercise control condition was evaluated on Blood pressure, heart rate variability, brachial-ankle pulse wave velocity, and flow-mediated dilation. High-intensity isometric exercise induced greater autonomic disturbance and reduced baPWV (P<0.05), while both intensities increased flow-mediated dilation (P<0.001) with no immediate changes in BP.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: