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Related Concept Videos

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.
Sustained exercise increases the muscles' oxygen demand, which can be...
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Exercise and Muscle Performance01:27

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Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
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Exercise and Cardiovascular Response01:20

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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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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.
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...
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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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Exercise Stress Test01:26

Exercise Stress Test

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Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
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Changes in rowing technique over a routine one hour low intensity high volume training session.

Hugh A M Mackenzie1, Anthony M J Bull, Alison H McGregor

  • 1Biodynamics Group, Imperial College London , UK.

Journal of Sports Science & Medicine
|October 24, 2013
PubMed
Summary

Elite rowers can maintain their rowing technique and force output during a one-hour, low-intensity training session. Subtle changes observed may be due to warm-up or early fatigue, not a decline in skill.

Keywords:
Kinematicscompetition levelfatigueforce curve profiles

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • High-volume, low-intensity training is common for elite rowers.
  • Concerns exist regarding technique degradation during prolonged rowing sessions.

Purpose of the Study:

  • To test if elite rowers maintain technique over a one-hour rowing ergometer session.
  • To investigate changes in force generation and spinal kinematics during prolonged rowing.

Main Methods:

  • Six elite male sweep oarsmen performed a one-hour rowing ergometer session.
  • Rowing technique, force generation, and spinal kinematics were assessed using an electromagnetic device and load cell.
  • Data were recorded every 10 minutes during the session.

Main Results:

  • Elite rowers sustained their rowing technique and force parameters throughout the hour.
  • Minor changes observed: a ~10N fall in force output early on and a 3-degree change in leg compression with pelvic rotation at the end.
  • The significance of these subtle changes (warm-up vs. fatigue) remains unclear.

Conclusions:

  • Low-intensity, high-volume ergometer rowing does not detrimentally affect the technique of experienced elite rowers.
  • Adequate warm-up is crucial for establishing optimal rowing technique.
  • Further research is needed to differentiate between warm-up effects and early fatigue indicators.