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Related Concept Videos

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.
Sustained exercise increases the muscles' oxygen demand, which can be met...
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...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart rate...

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Related Experiment Video

Updated: May 16, 2026

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
12:59

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Cardiac work remains high after strength exercise in elderly.

A C C Queiroz1, H Kanegusuku, M R Chehuen

  • 1Exercise Hemodynamic Laboratory, School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.

International Journal of Sports Medicine
|November 24, 2012
PubMed
Summary

Strength training elevates heart rate and cardiac sympathetic modulation in elderly individuals for hours post-exercise. This contrasts with younger adults, highlighting unique cardiovascular responses in older populations.

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Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People
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Published on: July 5, 2017

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Area of Science:

  • Exercise Physiology
  • Cardiovascular Health
  • Gerontology

Background:

  • Moderate- to high-intensity strength training is recommended for healthy adults.
  • Younger adults exhibit decreased blood pressure and elevated heart rate post-strength training.
  • Cardiovascular responses to strength training in the elderly are not well-established.

Purpose of the Study:

  • To investigate the acute effects of a single strength training session on hemodynamic variables and heart rate variability in elderly subjects.
  • To compare these effects with those observed in younger populations.
  • To determine the duration of these cardiovascular changes.

Main Methods:

  • 16 elderly subjects participated in a randomized crossover study with Control and Exercise sessions.
  • Exercise involved 3 sets of 8 repetitions at 85% of one-repetition maximum (8 RM) for 9 exercises.
  • Hemodynamic variables and heart rate variability were measured pre- and post-intervention.

Main Results:

  • Systolic blood pressure did not change post-exercise but increased post-control. Diastolic blood pressure and systemic vascular resistance increased similarly after both sessions.
  • Cardiac output and stroke volume decreased post-exercise. Heart rate, rate-pressure product, and low- to high-frequency ratio of heart rate variability increased post-exercise.
  • Ambulatory blood pressure remained similar, but heart rate and rate-pressure product were elevated for up to 4.5 hours post-exercise.

Conclusions:

  • A single strength training session elevates cardiac sympathetic modulation and heart rate in elderly subjects.
  • These effects lead to prolonged elevation of cardiac work in older adults.
  • Elderly individuals exhibit distinct cardiovascular adaptations to strength training compared to younger adults.