Related Experiment Video
Updated: Jul 4, 2026
08:21
Non-invasive Assessments of Subjective and Objective Recovery Characteristics Following an Exhaustive Jump Protocol
Published on: June 8, 2017
A proposed method for determining peak power in the jump squat exercise
Li Li1, Michael W Olson, Jason B Winchester
1Department of Kinesiology, Louisiana State University, Baton Rouge, Louisiana, USA. lli3@lsu.edu
Journal of Strength and Conditioning Research
|June 14, 2008
Summary
A new proposed method (PM) for calculating peak power (PP) in the jump squat (JS) offers greater accuracy than traditional approaches. This standardized method ensures reliable athletic performance measurement.
Area of Science:
- Biomechanics
- Sports Science
- Human Movement Analysis
Background:
- Peak power (PP) in the jump squat (JS) is a key indicator of athletic performance.
- Current methods for determining PP lack standardization, leading to potential inaccuracies.
- A need exists for a reliable and validated method to measure PP in the JS.
Purpose of the Study:
- To introduce and validate a proposed method (PM) for determining peak power (PP) in the jump squat (JS).
- To compare the PP measurements obtained using the PM against commonly used methods in existing literature.
- To establish a standardized approach for accurate PP assessment in athletic performance evaluation.
Main Methods:
- Developed a proposed method (PM) calculating PP as the product of vertical ground reaction forces and the velocity of the center of mass (subject and bar).
- Recruited 15 male subjects for JS testing at five different load conditions (30-50% body weight).
- Employed paired t-tests to statistically compare PP measurements from the PM against traditional methods.
Main Results:
- The PM yielded an average PP of 3782 +/- 906 W across the tested loads.
- Traditional methods underestimated PP: bar-only force-velocity was 72% lower (1057 +/- 243 W).
- Another traditional method overestimated PP by 8% (4100 +/- 844 W) compared to the PM.
Conclusions:
- Traditional methods for calculating peak power in jump squats may lead to significant overestimations or underestimations.
- The proposed method (PM) provides a more accurate and standardized approach to measuring peak power.
- Implementing the PM will enhance the validity and generalizability of research findings in athletic performance analysis.
Related Concept Videos
01:22Instantaneous Power
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.
01:24Generation of Action Potential in Skeletal Muscles
Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the cell's...
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the cell's...
01:27Exercise 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...
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...
01:08Power
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,...
01:16Maximum 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...
By substituting the entire circuit with...
01:20Motor 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...
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...