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Maximum Deflection

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When analyzing beams under unsymmetrical loads, such as a train moving on a bridge, it is crucial to accurately determine the points of maximum stress and deflection. The process involves identifying the maximum deflection of the beam, which may not always occur at its midpoint due to the uneven distribution of the load.
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Related Experiment Video

Updated: Jun 12, 2025

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations

Published on: May 1, 2018

Evaluating the optimal height for hamstring activity in the maximum-speed single-leg bridge test.

Yuto Sano^1,2, Masashi Kawabata^1,3,3, Yuki Sumiya¹

¹Physical Therapy for Sports and Musculoskeletal System, Kitasato University Graduate School of Medical Sciences, Sagamihara, Japan.

International Journal of Sports Medicine

|February 11, 2025

Summary

The maximum-speed single-leg bridge test with 40 or 60 cm platforms effectively increases hamstring activation. This functional test enhances buttock-raising speed and heel-bearing force for athletes.

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Area of Science:

Sports Medicine
Biomechanics
Exercise Physiology

Background:

Hamstring strain injuries are common in high-speed athletic movements.
Existing functional tests do not reliably induce rapid hamstring contractions.
Optimizing tests for hamstring activation is crucial for injury prevention and rehabilitation.

Purpose of the Study:

To identify the optimal platform height for the maximum-speed single-leg bridge test.
To maximize hamstring muscle activation during this functional test.
To compare hamstring activation between different platform heights and the conventional single-leg bridge test.

Main Methods:

A cross-sectional study involving 26 healthy male recreational athletes.
Participants performed the maximum-speed single-leg bridge test on 20, 40, and 60 cm platforms.
Electromyography measured semitendinosus and biceps femoris activity; buttock-raising speed and heel-bearing force were also recorded.

Main Results:

Maximum-speed single-leg bridge test yielded significantly faster buttock-raising speeds (0.7-1.0 m/s) compared to the conventional test (0.5 m/s).
Higher hamstring (semitendinosus, biceps femoris) activation (>90% MVC) was observed with 40 and 60 cm platforms.
The 40 cm platform demonstrated the highest heel-bearing force, with increased gluteus maximus activity.

Conclusions:

The maximum-speed single-leg bridge test, particularly with 40 and 60 cm platforms, significantly enhances hamstring activation.
This modified test demonstrates greater efficacy in inducing rapid hamstring contractions than the conventional single-leg bridge test.
Optimal platform heights of 40-60 cm are recommended for maximizing hamstring engagement in functional testing.