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Related Concept Videos

Blood Flow01:29

Blood Flow

Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
Assessing Blood pressure in the Leg01:11

Assessing Blood pressure in the Leg

Proper measurement of leg blood pressure is a critical skill for healthcare providers, ensuring precise and reliable readings. When performed correctly, this procedure informs patient care and enhances the efficacy of interventions. The following text outlines step-by-step guidelines to measure blood pressure in the leg, providing clarity and ease of understanding for practitioners.
Preparation:
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
Exercise and Cardiac Output01:17

Exercise and Cardiac Output

Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
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Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...

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Updated: Jul 12, 2026

Exergaming in Older People Living with HIV Improves Balance, Mobility and Ameliorates Some Aspects of Frailty
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Augmented forearm vasoconstriction during dynamic exercise in healthy older men.

J A Taylor1, G A Hand, D G Johnson

  • 1Department of Exercise and Sport Sciences, University of Arizona, Tucson.

Circulation
|December 1, 1992
PubMed
Summary

Older men experience heightened vasoconstriction in their non-exercising limbs during dynamic exercise, likely due to increased sympathetic nervous system activity. This finding suggests an age-related alteration in vascular control during physical activity.

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Area of Science:

  • Cardiovascular Physiology
  • Exercise Physiology
  • Aging Research

Background:

  • The impact of aging on the body's physiological responses to exercise is a critical area of research.
  • Understanding how vasoconstriction in non-active limbs changes with age during dynamic exercise is important for assessing cardiovascular health.

Purpose of the Study:

  • To investigate whether the vasoconstriction response in the non-active limb during large-muscle dynamic exercise is amplified in older humans.
  • To compare the physiological responses to exercise between young and older healthy men.

Main Methods:

  • The study involved 16 young (26 years) and 12 older (65 years) healthy men with similar physical activity levels.
  • Participants performed supine leg cycling at various submaximal intensities while researchers measured blood pressure, heart rate, forearm blood flow, vascular resistance, and plasma norepinephrine and epinephrine concentrations.

Main Results:

  • Older men exhibited lower peak workload and oxygen uptake but similar blood pressure responses to exercise compared to younger men.
  • Forearm vascular resistance was higher in older men, accompanied by greater increases in antecubital venous norepinephrine concentrations during exercise.
  • Forearm skin blood flow responses were similar between groups, but vasoconstrictor responses to a non-exercise sympathoexcitatory stimulus were blunted in older men.

Conclusions:

  • Healthy older men show augmented forearm vasoconstriction during dynamic exercise, likely mediated by increased sympathetic outflow to skeletal muscle resistance vessels.
  • These findings indicate an age-related alteration in sympathetic vasoconstrictor adjustments, not a general hyperresponsiveness to stress.
  • Arterial blood pressure regulation appears to be normal in the healthy older men studied.