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Related Concept Videos

Power01:08

Power

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,...
Power Expended by a Constant Force00:57

Power Expended by a Constant Force

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.
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...

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Related Experiment Video

Updated: Jul 14, 2026

Non-invasive Assessments of Subjective and Objective Recovery Characteristics Following an Exhaustive Jump Protocol
08:21

Non-invasive Assessments of Subjective and Objective Recovery Characteristics Following an Exhaustive Jump Protocol

Published on: June 8, 2017

Methodological concerns for determining power output in the jump squat.

Prue Cormie1, Russell Deane, Jeffrey M McBride

  • 1School of Exercise, Biomedical and Health Sciences, Edith Cowan University, Perth, Western Australia.

Journal of Strength and Conditioning Research
|May 29, 2007
PubMed
Summary

The single linear position transducer (LPT) overestimates jump squat power. Using multiple devices like force plates (FP) and LPTs provides more valid power measurements for resistance training analysis.

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Area of Science:

  • Biomechanics
  • Sports Science
  • Exercise Physiology

Background:

  • Accurate measurement of power output is crucial for assessing athletic performance and training adaptations.
  • Various technologies, including force plates (FP) and linear position transducers (LPT), are used to quantify jump squat (JS) performance.
  • Discrepancies exist in the validity of different measurement techniques, necessitating further investigation.

Purpose of the Study:

  • To evaluate the validity of different combinations of force plates (FP) and linear position transducers (LPT) for measuring power during the jump squat (JS).
  • To compare power output measurements obtained using one LPT (1-LPT), one LPT with an FP (1-LPT + FP), and two LPTs with an FP (2-LPT + FP).

Main Methods:

  • Nine resistance-trained men performed jump squats at 30% (JS30) and 90% (JS90) of their one-repetition maximum (1RM).
  • Vertical velocity, force, and power data were collected simultaneously using three measurement configurations: 1-LPT, 1-LPT + FP, and 2-LPT + FP.
  • Calculated power-time curves were compared across the different methodologies.

Main Results:

  • The 1-LPT method significantly overestimated peak force and peak power in both JS30 and JS90 compared to 1-LPT + FP and 2-LPT + FP.
  • Peak power was higher with 2-LPT + FP than 1-LPT + FP under the JS90 condition.
  • Peak vertical velocity was lower with 2-LPT + FP compared to 1-LPT and 1-LPT + FP in JS90.

Conclusions:

  • The measurement technique significantly impacts jump squat (JS) power output quantification.
  • The single linear position transducer (1-LPT) method is not valid for determining jump squat power.
  • The 1-LPT + FP method may not accurately reflect power in free-weight exercises with substantial horizontal motion.