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Maximal exercise capacity is related to cardiovascular structure in patients with longstanding hypertension. A LIFE

M H Olsen1, K Wachtell, K L Hermann

  • 1Department of Clinical Physiology, Nuclear Medicine Glostrup Hospital, University of Copenhagen, Denmark. mho@dadlnet.dk

American Journal of Hypertension
|January 5, 2002
PubMed

Insights

Patients with longstanding hypertension experience reduced exercise capacity due to cardiovascular changes. This impaired ability is linked to stiff arteries and lower oxygen reserves, indicating that heart and blood vessel remodeling directly impacts physical function.

Area of Science:

  • Cardiovascular Physiology
  • Hypertension Research
  • Exercise Science

Background:

  • Cardiovascular hypertrophy and remodeling are linked to reduced exercise capacity in never-treated hypertension.
  • The relationship between these factors in longstanding hypertension with target organ damage is less understood.

Purpose of the Study:

  • To investigate the association between cardiovascular remodeling and impaired exercise capacity in patients with longstanding hypertension and target organ damage.

Main Methods:

  • 43 unmedicated patients with essential hypertension and left ventricular (LV) hypertrophy underwent maximal workload and oxygen reserve testing.
  • Measurements included 24-h ambulatory blood pressure, LV mass index (MRI and echocardiography), systemic vascular compliance, forearm vascular resistance, and carotid artery intima media thickness and distensibility.

Main Results:

  • Patients achieved lower maximal workload than predicted (P = .01).
  • Impaired exercise capacity correlated with lower common carotid artery distensibility (r = 0.38, P = .01) and lower oxygen reserve (r = 0.68, P < .001).
  • Lower oxygen reserve was independently associated with higher LV mass index, lower systemic vascular compliance, and higher minimal forearm vascular resistance (adjusted R2 = 0.53, P < .001).

Conclusions:

  • Patients with longstanding hypertension and target organ damage exhibit reduced maximal workload achievement.
  • This impairment is associated with decreased common carotid artery distensibility and lower oxygen reserve.
  • Cardiovascular hypertrophy and remodeling appear to independently reduce exercise capacity by affecting vascular compliance and peripheral resistance.
Abstract

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