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Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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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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Pathophysiology of Cardiac Performance01:29

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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...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
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Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

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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.
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The stroke rate influences performance, technique and core stability during rowing ergometer.

Youri Duchene1,2, Frédéric R Simon1,2,3, Geoffrey N Ertel1,2

  • 1Université de Lorraine, DevAH, Nancy, France.

Sports Biomechanics
|January 11, 2024
PubMed
Summary
This summary is machine-generated.

Higher stroke rates in rowing ergometer training enhance power output and mimic competitive technique by increasing neuromuscular activation. Lower stroke rates can improve trunk extension timing and erector spinae activation for better force transfer.

Keywords:
Power productionmuscles co-activationsneuromuscular controlpelvis kinematicstrunk kinematics

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Rowing performance relies on efficient force transfer and technique.
  • Understanding the impact of stroke rate on biomechanics is crucial for training optimization.

Purpose of the Study:

  • To investigate the effects of varying stroke rates on rowing performance, technique, and core stability.
  • To analyze power output, kinematics, and neuromuscular activation at different stroke rates.

Main Methods:

  • Twenty-four elite rowers completed maximal one-minute bouts at 20, 28, and 34 strokes per minute (spm) on a rowing ergometer.
  • Measurements included power at handle, legs, trunk, and arms, alongside core kinematics and neuromuscular activation (electromyography).

Main Results:

  • Increased stroke rate enhanced handle power, particularly in the first half of the drive phase, due to higher segment power contributions.
  • Technical adjustments observed included a greater mean-to-peak power ratio across segments.
  • Higher trunk power at elevated stroke rates was associated with delayed trunk extension, despite no significant increase in erector spinae activation, highlighting the role of core stability.

Conclusions:

  • Rowing at lower stroke rates may be beneficial for developing earlier trunk extension and maintaining erector spinae activation.
  • Training at higher stroke rates promotes a technique closer to competitive rowing, enhancing neuromuscular activation and maximizing power production.