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Related Concept Videos

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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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.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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Related Experiment Video

Updated: Feb 26, 2026

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Acute Effects and Perceptions of Deep Oscillation Therapy for Improving Hamstring Flexibility.

Zachary K Winkelmann, Ethan J Roberts, Kenneth E Games

    Journal of Sport Rehabilitation
    |July 18, 2017
    PubMed
    Summary

    Deep oscillation therapy (DOT) significantly improved hamstring flexibility in healthy individuals. This study provides evidence for DOT as an effective method to enhance range of motion and flexibility.

    Keywords:
    HIVAMATathletic trainingrange of motion

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    Area of Science:

    • Physical Therapy
    • Rehabilitation Science
    • Sports Medicine

    Background:

    • Hamstring inflexibility commonly treated with massage, stretching, and soft tissue mobilization.
    • Deep oscillation therapy (DOT) presents an alternative intervention for flexibility enhancement.
    • Limited evidence currently exists on the efficacy of DOT for improving hamstring flexibility.

    Purpose of the Study:

    • To investigate the effectiveness of deep oscillation therapy (DOT) in improving hamstring flexibility.
    • To assess the impact of DOT on passive straight leg raise measurements.
    • To evaluate patient-reported outcomes following DOT intervention.

    Main Methods:

    • A randomized single-cohort study design was employed in a research laboratory setting.
    • Twenty-nine healthy, physically active individuals participated, receiving a single session of DOT.
    • Hamstring flexibility was measured using passive straight leg raise with a digital inclinometer; patient-reported outcomes included the Copenhagen Hip and Groin Outcome Score and Global Rating of Change (GRoC).

    Main Results:

    • Passive straight leg raise significantly improved after DOT intervention (P < .001), with a mean increase of 6.17°.
    • A significant moderate positive correlation (r = .439, P = .02) was found between GRoC scores and the change in hamstring flexibility.
    • Participants perceived DOT as beneficial for improving hamstring flexibility and found the treatment to be relaxing.

    Conclusions:

    • Deep oscillation therapy (DOT) is demonstrated as an effective intervention for increasing hamstring flexibility.
    • The findings support the use of DOT as a viable method to enhance hamstring range of motion.
    • Further research may explore long-term effects and applications in different populations.