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Related Concept Videos

Kinetic Energy00:23

Kinetic Energy

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Kinetic energy is the ability of an object in motion to do work or enact change. It can take on many forms. For instance, water flowing down a waterfall has kinetic energy. In biological systems, particles of light travel and are absorbed by plants to create chemical energy. Animals consume the chemical energy and give off molecules that carry their scent through the air. They also generate kinetic energy when they run away from predators. Entire systems also possess kinetic energy, like the...
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Enzyme Kinetics01:19

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Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
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Kinetic Molecular Theory: Molecular Velocities, Temperature, and Kinetic Energy03:07

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The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws.
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Isotonic and Isometric Muscle Contractions01:22

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Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
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Frequency-dependent Selection01:21

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Related Experiment Video

Updated: Jan 30, 2026

In Vivo Measurement of Hindlimb Dorsiflexor Isometric Torque from Pig
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In Vivo Measurement of Hindlimb Dorsiflexor Isometric Torque from Pig

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Effect of Sampling Frequency on Isometric Midthigh-Pull Kinetics.

Thomas Dos'Santos, Paul A Jones, Jonathan Kelly

    International Journal of Sports Physiology and Performance
    |January 27, 2019
    PubMed
    Summary
    This summary is machine-generated.

    Lower sampling frequencies (500 Hz) are reliable for isometric midthigh pull (IMTP) testing. This finding supports using 500 Hz for accurate assessment of peak force and rate of force development (RFD) in athletes.

    Keywords:
    force-time curvepeak forcerate of force developmentreliability

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    Maximum Isometric Tetanic Force Measurement of the Tibialis Anterior Muscle in the Rat
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    Area of Science:

    • Biomechanics
    • Sports Science
    • Human Movement Analysis

    Background:

    • Skeletal muscle function is assessed using isometric midthigh pull (IMTP) force-time curves.
    • Previous IMTP studies used varied sampling frequencies (500-1000 Hz) without investigating their influence on kinetic outcomes.

    Purpose of the Study:

    • To determine the effect of different sampling frequencies on IMTP kinetic variables.
    • Specifically, to analyze peak force, time-specific force (100, 150, 200 ms), and rate of force development (RFD) across various time bands (0-100, 0-150, 0-200 ms).

    Main Methods:

    • Thirty academy rugby league players (age 17.5 ± 1.1 years) participated.
    • IMTP trials were recorded at 2000 Hz and down-sampled to 1500, 1000, and 500 Hz for analysis.

    Main Results:

    • High within-session reliability (ICC ≥ 0.80, CV ≤ 14.4%) was observed for most force and RFD variables across all frequencies.
    • No significant differences (P > 0.05) were found in peak force, time-specific force, or RFD (0-200 ms) between sampling frequencies.
    • Slightly higher variance was noted for RFD at 0-100 and 0-150 ms (CV = 18.0-24.1%).

    Conclusions:

    • Sampling frequencies as low as 500 Hz are adequate for accurate and reliable IMTP assessments.
    • Practitioners and researchers can confidently use 500 Hz for measuring peak force, time-specific force, and RFD during IMTP.