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Hemodynamic characteristics of young men at risk for hypertension at rest and during laboratory stressors
S A Everson1, W R Lovallo, K P Sausen
1Veterans Affairs Medical Center, University of Oklahoma Health Sciences Center.
Insights
Hypertension risk is better predicted by combining resting blood pressure and parental history. This combined approach reveals greater hemodynamic activity in higher-risk individuals, suggesting physiological reactivity is key.
Area of Science:
- Cardiovascular Physiology
- Hypertension Research
- Clinical Risk Assessment
Background:
- Hypertension is a major cardiovascular risk factor.
- Identifying individuals at risk for hypertension is crucial for early intervention.
- Hemodynamic reactivity may serve as an early indicator of hypertension risk.
Purpose of the Study:
- To investigate hemodynamic activity in young men with varying risks for hypertension.
- To determine if a combination of risk factors better predicts hemodynamic reactivity than individual factors.
- To explore the relationship between physiological reactivity and hypertension risk.
Main Methods:
- Classified participants into low-, moderate-, and high-risk groups based on resting systolic blood pressure (SBP) and parental history of essential hypertension (PH).
- Measured hemodynamic variables including SBP, diastolic BP (DBP), heart rate, and rate-pressure product (RPP) at rest and during mental arithmetic and cold pressor tasks.
- Analyzed differences in baseline hemodynamics and reactivity across risk groups.
Main Results:
- Hemodynamic activity increased progressively across risk groups at rest and during tasks.
- Significant differences in SBP, DBP, and RPP were observed at baseline and in response to mental arithmetic across risk groups.
- The predictive power of risk factors for hemodynamic reactivity was stronger when using a combined measure (SBP and PH) versus individual factors.
Conclusions:
- Hemodynamic reactivity to mental stress is better predicted by a combination of resting SBP and PH.
- Physiological reactivity may be a significant indicator accompanying increased hypertension risk.
- Combined risk factor assessment improves prediction of hemodynamic responses relevant to hypertension development.
Abstract:
Examined hemodynamic activity--at rest, during mental arithmetic, and during hand cold pressor--in young men varying in risk for hypertension. Classification into low-risk (n = 72), moderate-risk (n = 20), and high-risk (n = 13) groups was based on resting systolic blood pressure (SBP) and parental history of essential hypertension (PH). Dependent variables were SBP, diastolic BP (DBP), heart rate, and rate-pressure product (RPP). Progressively greater hemodynamic activity was seen across risk groups at rest and during the tasks. Risk groups differed significantly in SBP, DBP, and RPP at baseline (ps less than .003) and in size of response to mental arithmetic (ps less than .05) but not to cold pressor. These relationships were either absent or weaker when using either risk factor alone to form risk groups. These findings suggest that hemodynamic reactivity to mental stress is predicted better by a combination of resting SBP and PH than by either risk factor alone and that physiological reactivity may be an important accompaniment of increased risk for hypertension.