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Related Concept Videos

Instantaneous Power01:22

Instantaneous Power

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Instantaneous power is important in electrical circuits, mainly when dealing with sinusoidal input. Instantaneous power, denoted as p(t), results from the multiplication of the instantaneous voltage (v(t)) across an element and the instantaneous current (i(t)) flowing through it. This relationship adheres to the passive sign convention and represents a fundamental principle in electrical engineering.
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Power Expended by a Constant Force00:57

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The relationship between work done and the time taken to do it can be explained using the concept of power. For example, several sprinters in a race may have the same velocity when they reach the finish line, therefore doing the same amount of work, but the winner does it in the least amount of time. Thus, power is defined as the rate of doing work. Since work can vary as a function of time, the average power is defined as the work done during a time interval, divided by the time interval.
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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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SwimOne. New Device for Determining Instantaneous Power and Propulsive Forces in Swimming.

Francisco Hermosilla1,2, Lis Corral-Gómez3, José M González-Ravé1

  • 1Sport Training Laboratory, Faculty of Sports Sciences, University of Castilla-La Mancha, 45071 Toledo, Spain.

Sensors (Basel, Switzerland)
|December 17, 2020
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Summary

A new device, SwimOne, accurately measures swimming propulsive force and instantaneous power. This innovative tool also provides customizable resistance for enhanced swimmer training and performance analysis.

Keywords:
forcepowerresistanceswimmingtraining

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Area of Science:

  • Sports Science
  • Biomechanical Engineering
  • Human Movement Analysis

Background:

  • Swimming performance is significantly influenced by propulsive forces and instantaneous power.
  • Accurate measurement of these parameters is crucial for performance optimization and training.

Purpose of the Study:

  • To introduce SwimOne, a novel device for measuring propulsive force and estimating instantaneous power in swimmers.
  • To present the design and validation of a prototype capable of providing customizable opposition forces for training.

Main Methods:

  • Development of a conceptual model based on swimmer differential equations.
  • Identification of key variables for measurement and estimation.
  • Selection and integration of sensor and actuator systems.
  • Design and validation protocols for the SwimOne prototype.

Main Results:

  • The SwimOne device successfully monitors swimmer variables, propulsive force, and instantaneous power.
  • Experimental validation across various swimming strokes (crawl, backstroke, butterfly, breaststroke) demonstrated accuracy.
  • Preliminary results confirm the device's validity under different load conditions.

Conclusions:

  • SwimOne is a valid and reliable tool for measuring instantaneous force and power in swimming.
  • The device offers potential for advanced swimmer training and performance diagnostics.
  • The customizable opposition force feature enhances its utility for targeted training interventions.