Trunk muscle activity while lifting objects of unexpected weight

Masahiro Watanabe, Koji Kaneoka, Yu Okubo, Itsuo Shiina, Masaki Tatsumura, Shumpei Miyakawa

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Objective: To determine trunk muscle activity when lifting an object of greater weight than expected, which may contribute to the development of low back pain. Design: Electromyographic evaluation of trunk muscle activity. Setting: University of Tsukuba, Spine laboratory. Participants: Eleven healthy men with a mean age of 24 (SD 2) years. Interventions: Trunk muscle activity was measured when subjects lifted an object with their right arm in immediate response to a light stimulus. Surface and wire electrodes were used to measure the activity of the rectus abdominis, external oblique and erector spinae muscles, and the transversus abdominis and lumbar multifidus muscles, respectively. The lifting tests were performed in three different settings: lifting an expected 1-kg object, lifting an unexpected 4-kg object (erroneously expected to weigh 1. kg), and lifting an expected 4-kg object. Main outcome measures: The muscle activity induced when subjects lifted objects of different weights was compared by calculating the root mean square (RMS) of muscle activity at rest and % maximum voluntary contraction. Results: When the subjects were aware of the weight of the object to be lifted, the activity of the external oblique, transversus abdominis, erector spinae and lumbar multifidus muscles increased immediately after lifting. When the subjects were not aware of the weight of the object to be lifted, the increase in muscle activity was delayed (. P<. 0.05). Conclusions: Trunk muscles may not be able to function appropriately when individuals lift an object that is much heavier than expected.

Original languageEnglish
Pages (from-to)78-83
Number of pages6
JournalPhysiotherapy (United Kingdom)
Volume99
Issue number1
DOIs
Publication statusPublished - 2013 Mar

Fingerprint

Weights and Measures
Muscles
Paraspinal Muscles
Abdominal Muscles
Rectus Abdominis
Low Back Pain
Healthy Volunteers
Electrodes
Spine
Outcome Assessment (Health Care)
Light

Keywords

  • Electromyography
  • Estimate
  • Feedforward
  • Low back pain
  • Rehabilitation
  • Trunk muscles

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Trunk muscle activity while lifting objects of unexpected weight. / Watanabe, Masahiro; Kaneoka, Koji; Okubo, Yu; Shiina, Itsuo; Tatsumura, Masaki; Miyakawa, Shumpei.

In: Physiotherapy (United Kingdom), Vol. 99, No. 1, 03.2013, p. 78-83.

Research output: Contribution to journalArticle

Watanabe, M, Kaneoka, K, Okubo, Y, Shiina, I, Tatsumura, M & Miyakawa, S 2013, 'Trunk muscle activity while lifting objects of unexpected weight', Physiotherapy (United Kingdom), vol. 99, no. 1, pp. 78-83. https://doi.org/10.1016/j.physio.2011.09.005
Watanabe, Masahiro ; Kaneoka, Koji ; Okubo, Yu ; Shiina, Itsuo ; Tatsumura, Masaki ; Miyakawa, Shumpei. / Trunk muscle activity while lifting objects of unexpected weight. In: Physiotherapy (United Kingdom). 2013 ; Vol. 99, No. 1. pp. 78-83.
@article{d68710b6a5b242849a2c4e4376a17bf7,
title = "Trunk muscle activity while lifting objects of unexpected weight",
abstract = "Objective: To determine trunk muscle activity when lifting an object of greater weight than expected, which may contribute to the development of low back pain. Design: Electromyographic evaluation of trunk muscle activity. Setting: University of Tsukuba, Spine laboratory. Participants: Eleven healthy men with a mean age of 24 (SD 2) years. Interventions: Trunk muscle activity was measured when subjects lifted an object with their right arm in immediate response to a light stimulus. Surface and wire electrodes were used to measure the activity of the rectus abdominis, external oblique and erector spinae muscles, and the transversus abdominis and lumbar multifidus muscles, respectively. The lifting tests were performed in three different settings: lifting an expected 1-kg object, lifting an unexpected 4-kg object (erroneously expected to weigh 1. kg), and lifting an expected 4-kg object. Main outcome measures: The muscle activity induced when subjects lifted objects of different weights was compared by calculating the root mean square (RMS) of muscle activity at rest and {\%} maximum voluntary contraction. Results: When the subjects were aware of the weight of the object to be lifted, the activity of the external oblique, transversus abdominis, erector spinae and lumbar multifidus muscles increased immediately after lifting. When the subjects were not aware of the weight of the object to be lifted, the increase in muscle activity was delayed (. P<. 0.05). Conclusions: Trunk muscles may not be able to function appropriately when individuals lift an object that is much heavier than expected.",
keywords = "Electromyography, Estimate, Feedforward, Low back pain, Rehabilitation, Trunk muscles",
author = "Masahiro Watanabe and Koji Kaneoka and Yu Okubo and Itsuo Shiina and Masaki Tatsumura and Shumpei Miyakawa",
year = "2013",
month = "3",
doi = "10.1016/j.physio.2011.09.005",
language = "English",
volume = "99",
pages = "78--83",
journal = "Physiotherapy",
issn = "0031-9406",
publisher = "Elsevier",
number = "1",

}

TY - JOUR

T1 - Trunk muscle activity while lifting objects of unexpected weight

AU - Watanabe, Masahiro

AU - Kaneoka, Koji

AU - Okubo, Yu

AU - Shiina, Itsuo

AU - Tatsumura, Masaki

AU - Miyakawa, Shumpei

PY - 2013/3

Y1 - 2013/3

N2 - Objective: To determine trunk muscle activity when lifting an object of greater weight than expected, which may contribute to the development of low back pain. Design: Electromyographic evaluation of trunk muscle activity. Setting: University of Tsukuba, Spine laboratory. Participants: Eleven healthy men with a mean age of 24 (SD 2) years. Interventions: Trunk muscle activity was measured when subjects lifted an object with their right arm in immediate response to a light stimulus. Surface and wire electrodes were used to measure the activity of the rectus abdominis, external oblique and erector spinae muscles, and the transversus abdominis and lumbar multifidus muscles, respectively. The lifting tests were performed in three different settings: lifting an expected 1-kg object, lifting an unexpected 4-kg object (erroneously expected to weigh 1. kg), and lifting an expected 4-kg object. Main outcome measures: The muscle activity induced when subjects lifted objects of different weights was compared by calculating the root mean square (RMS) of muscle activity at rest and % maximum voluntary contraction. Results: When the subjects were aware of the weight of the object to be lifted, the activity of the external oblique, transversus abdominis, erector spinae and lumbar multifidus muscles increased immediately after lifting. When the subjects were not aware of the weight of the object to be lifted, the increase in muscle activity was delayed (. P<. 0.05). Conclusions: Trunk muscles may not be able to function appropriately when individuals lift an object that is much heavier than expected.

AB - Objective: To determine trunk muscle activity when lifting an object of greater weight than expected, which may contribute to the development of low back pain. Design: Electromyographic evaluation of trunk muscle activity. Setting: University of Tsukuba, Spine laboratory. Participants: Eleven healthy men with a mean age of 24 (SD 2) years. Interventions: Trunk muscle activity was measured when subjects lifted an object with their right arm in immediate response to a light stimulus. Surface and wire electrodes were used to measure the activity of the rectus abdominis, external oblique and erector spinae muscles, and the transversus abdominis and lumbar multifidus muscles, respectively. The lifting tests were performed in three different settings: lifting an expected 1-kg object, lifting an unexpected 4-kg object (erroneously expected to weigh 1. kg), and lifting an expected 4-kg object. Main outcome measures: The muscle activity induced when subjects lifted objects of different weights was compared by calculating the root mean square (RMS) of muscle activity at rest and % maximum voluntary contraction. Results: When the subjects were aware of the weight of the object to be lifted, the activity of the external oblique, transversus abdominis, erector spinae and lumbar multifidus muscles increased immediately after lifting. When the subjects were not aware of the weight of the object to be lifted, the increase in muscle activity was delayed (. P<. 0.05). Conclusions: Trunk muscles may not be able to function appropriately when individuals lift an object that is much heavier than expected.

KW - Electromyography

KW - Estimate

KW - Feedforward

KW - Low back pain

KW - Rehabilitation

KW - Trunk muscles

UR - http://www.scopus.com/inward/record.url?scp=84872971722&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84872971722&partnerID=8YFLogxK

U2 - 10.1016/j.physio.2011.09.005

DO - 10.1016/j.physio.2011.09.005

M3 - Article

C2 - 23219652

AN - SCOPUS:84872971722

VL - 99

SP - 78

EP - 83

JO - Physiotherapy

JF - Physiotherapy

SN - 0031-9406

IS - 1

ER -