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Related Concept Videos

Exercise and Muscle Performance01:27

Exercise and Muscle Performance

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...
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...
Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective response...
Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Maximum Power Transfer01:16

Maximum Power Transfer

Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...

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Related Experiment Video

Updated: Jul 10, 2026

A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers
09:24

A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers

Published on: January 28, 2020

Maximal power and performance during a swim taper.

J D Trinity1, M D Pahnke, J A Sterkel

  • 1Kinesiology and Health Education, The University of Texas at Austin, Austin, TX 78712, USA. joeltrinity@mail.utexas.edu

International Journal of Sports Medicine
|October 26, 2007
PubMed
Summary

Increasing high-intensity training during a swim taper (High-Intensity Taper - HIT) maintained peak power and performance. Reducing high-intensity training (Low-Intensity Taper - LIT) worsened swim performance.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Swimming Performance

Background:

  • Tapering is crucial for optimizing athletic performance.
  • The impact of training intensity during taper on physiological and performance metrics requires further investigation.

Purpose of the Study:

  • To investigate the effects of altering training intensity during a taper on maximal mechanical power (Pmax), torque (T), velocity (V), and swim performance.
  • To compare a High-Intensity Taper (HIT) with a Low-Intensity Taper (LIT).

Main Methods:

  • Seven female collegiate swimmers underwent 7 weeks of testing using an arm ergometer with inertial loading.
  • Measurements of Pmax, T, and V were taken pre-taper and during two consecutive taper periods (HIT and LIT).
  • Swim performance was assessed at three competitive meets.

Main Results:

  • HIT resulted in 8-14% higher Pmax values compared to LIT.
  • Swim performance significantly worsened at the national championship meet following LIT.
  • HIT maintained swim performance, Pmax, and T prior to and at the national championship meet.

Conclusions:

  • A significant reduction in high-intensity training during taper diminishes the duration of peak Pmax, T, and swim performance.
  • Implementing a High-Intensity Taper strategy is effective in maintaining physiological and performance levels for competitive swimmers.