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Related Concept Videos

Power01:08

Power

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The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
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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.
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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.
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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.
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Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
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Average Power01:13

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In practical electrical applications, the concept of time-varying instantaneous power is not frequently utilized. Instead, focus shifts to the more practical quantity known as average power. Average power is determined by integrating the instantaneous power over a specified time period and subsequently dividing it by that duration.
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Related Experiment Video

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A Rapidly Incremented Tethered-Swimming Maximal Protocol for Cardiorespiratory Assessment of Swimmers
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Power output during a high-volume power-oriented back squat protocol.

Garrett M Hester1, Eric C Conchola, Ryan M Thiele

  • 1Department of Health and Human Performance, Oklahoma State University, Stillwater, Oklahoma.

Journal of Strength and Conditioning Research
|April 10, 2014
PubMed
Summary
This summary is machine-generated.

High-volume back squats with 16 repetitions did not hinder peak power output across sets. This suggests additional repetitions do not negatively impact power production in subsequent sets during resistance training.

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Biomechanics

Background:

  • Traditional power-oriented workouts recommend low-repetition resistance training.
  • Limited evidence exists on the impact of higher repetitions on power production.

Purpose of the Study:

  • To investigate power output during a high-volume, power-oriented back squat protocol.
  • To determine if additional repetitions within a set affect subsequent power production.

Main Methods:

  • Nineteen resistance-trained men performed 5 sets of 16 repetitions of the back squat at 40% of their 1-repetition maximum (1RM).
  • Peak power (PP) was measured during each repetition, focusing on explosive concentric phase execution.
  • A 2-minute rest interval was implemented between sets.

Main Results:

  • Power output significantly decreased within each set (p < 0.001).
  • No significant difference was observed in the highest repetition peak power (PPmax) between sets (p = 0.493).
  • The 2-minute rest periods were adequate for maintaining consistent power outputs across all sets.

Conclusions:

  • Performing 16 repetitions in a power-oriented back squat protocol does not diminish power production in subsequent sets.
  • This high-volume protocol may be beneficial for sports requiring repeated lower body explosive performances.
  • The findings support the use of such protocols when sustained high-intensity performance is needed.