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Related Concept Videos

Muscles of the Thorax01:25

Muscles of the Thorax

The thorax muscles are central to the body's respiration and provide essential support and movement for the upper body. They are intricately designed to facilitate the complex breathing process while also contributing to the structural integrity and mobility of the chest and upper limbs.
The diaphragm is at the core of thoracic musculature, the primary muscle involved in breathing. This expansive, dome-shaped muscle marks the division between the thoracic and abdominal cavities. It originates...
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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.
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Motor Unit Stimulation01:20

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Axial and Appendicular Muscles01:18

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Related Experiment Video

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Muscle Function Obtained with Motion Mode Ultrasound and Surface Electromyography during Core Endurance Exercise
09:21

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Published on: August 25, 2022

Trunk muscle activity while lifting objects of unexpected weight.

Masahiro Watanabe1, Koji Kaneoka, Yu Okubo

  • 1Department of Sports Medicine, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan.

Physiotherapy
|December 11, 2012
PubMed
Summary

Unexpectedly heavy lifting impairs trunk muscle response, potentially contributing to low back pain. Proper muscle activation is crucial for safe lifting and preventing injury.

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Spinal Health

Background:

  • Low back pain is a prevalent issue often linked to occupational and daily activities.
  • Understanding trunk muscle function during lifting is critical for injury prevention.
  • Unexpectedly heavy loads pose a significant risk factor for spinal injuries.

Purpose of the Study:

  • To investigate trunk muscle activity during unexpected heavy lifting.
  • To determine if altered muscle activation patterns contribute to low back pain risk.
  • To analyze the timing and magnitude of trunk muscle responses to varying object weights.

Main Methods:

  • Electromyography (EMG) was used to measure trunk muscle activity in healthy men.
  • Muscle activity of the rectus abdominis, external oblique, erector spinae, transversus abdominis, and lumbar multifidus was recorded.
  • Participants performed lifting tasks with expected and unexpectedly heavier objects.

Main Results:

  • Trunk muscle activation (external oblique, transversus abdominis, erector spinae, lumbar multifidus) was immediate when lifting expected weights.
  • When lifting unexpectedly heavier objects, the onset of trunk muscle activity was delayed.
  • This delayed response suggests a potential deficit in protective muscle function.

Conclusions:

  • Trunk muscles may exhibit delayed or inadequate responses when encountering unexpectedly heavy loads.
  • These altered neuromuscular patterns during lifting could increase susceptibility to low back pain.
  • Further research is needed to explore interventions for optimizing trunk muscle function during unpredictable lifting scenarios.