Upper limb mechanical changes following short duration repetitive eccentric exertions

Mary E. Sesto, Robert G. Radwin, Thomas Best, Terry G. Richard

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Background. Power hand tool use is considered a risk factor for upper extremity musculoskeletal disorders. It is unclear if submaximal eccentric activity inherent to power tool use adversely affects the mechanical properties of muscle. Methods. This study investigated in vivo changes in human upper limb dynamic mechanical properties following exposure to short-term repetitive submaximal eccentric exertions that are similar to operating an industrial power hand tool. Eighteen subjects (12 males and 6 females) were assigned to one of three exercise groups (isometric, eccentric or control) and exercised 10 min for 60 repetitions at 50% of isometric forearm supination maximum voluntary contraction. Supination strength and dynamic mechanical properties (stiffness, effective mass, and damping) of forearm rotation, modeled as a single-degree-of-freedom system during maximal exertion, were ascertained prior to exercise, immediately following exercise and 24 h later. Findings. Strength decreased for the isometric (17%) (P < 0.05) and eccentric (34%) (P < 0.01) groups following exercise. Only the eccentric exercise group had a reduction in mechanical stiffness (53%) (P < 0.01) and effective mass (58%) (P < 0.05). The other groups had no changes in mechanical properties. Interpretation. The change in mechanical properties following repetitive submaximal eccentric activity could negatively impact the ability of the arm to react to rapid forceful loading during repetitive industrial work activities and may indicate mechanical strain on the upper limb.

Original languageEnglish (US)
Pages (from-to)921-928
Number of pages8
JournalClinical Biomechanics
Volume19
Issue number9
DOIs
StatePublished - Nov 1 2004
Externally publishedYes

Fingerprint

Upper Extremity
Supination
Forearm
Hand
Arm
Exercise
Muscles

Keywords

  • Forearm
  • Mechanical properties
  • Stiffness
  • Submaximal eccentric exertions

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine

Cite this

Upper limb mechanical changes following short duration repetitive eccentric exertions. / Sesto, Mary E.; Radwin, Robert G.; Best, Thomas; Richard, Terry G.

In: Clinical Biomechanics, Vol. 19, No. 9, 01.11.2004, p. 921-928.

Research output: Contribution to journalArticle

Sesto, Mary E. ; Radwin, Robert G. ; Best, Thomas ; Richard, Terry G. / Upper limb mechanical changes following short duration repetitive eccentric exertions. In: Clinical Biomechanics. 2004 ; Vol. 19, No. 9. pp. 921-928.
@article{5d719b3f69294d3a9a9484a23f3bb9a0,
title = "Upper limb mechanical changes following short duration repetitive eccentric exertions",
abstract = "Background. Power hand tool use is considered a risk factor for upper extremity musculoskeletal disorders. It is unclear if submaximal eccentric activity inherent to power tool use adversely affects the mechanical properties of muscle. Methods. This study investigated in vivo changes in human upper limb dynamic mechanical properties following exposure to short-term repetitive submaximal eccentric exertions that are similar to operating an industrial power hand tool. Eighteen subjects (12 males and 6 females) were assigned to one of three exercise groups (isometric, eccentric or control) and exercised 10 min for 60 repetitions at 50{\%} of isometric forearm supination maximum voluntary contraction. Supination strength and dynamic mechanical properties (stiffness, effective mass, and damping) of forearm rotation, modeled as a single-degree-of-freedom system during maximal exertion, were ascertained prior to exercise, immediately following exercise and 24 h later. Findings. Strength decreased for the isometric (17{\%}) (P < 0.05) and eccentric (34{\%}) (P < 0.01) groups following exercise. Only the eccentric exercise group had a reduction in mechanical stiffness (53{\%}) (P < 0.01) and effective mass (58{\%}) (P < 0.05). The other groups had no changes in mechanical properties. Interpretation. The change in mechanical properties following repetitive submaximal eccentric activity could negatively impact the ability of the arm to react to rapid forceful loading during repetitive industrial work activities and may indicate mechanical strain on the upper limb.",
keywords = "Forearm, Mechanical properties, Stiffness, Submaximal eccentric exertions",
author = "Sesto, {Mary E.} and Radwin, {Robert G.} and Thomas Best and Richard, {Terry G.}",
year = "2004",
month = "11",
day = "1",
doi = "10.1016/j.clinbiomech.2004.06.005",
language = "English (US)",
volume = "19",
pages = "921--928",
journal = "Clinical Biomechanics",
issn = "0268-0033",
publisher = "Elsevier Limited",
number = "9",

}

TY - JOUR

T1 - Upper limb mechanical changes following short duration repetitive eccentric exertions

AU - Sesto, Mary E.

AU - Radwin, Robert G.

AU - Best, Thomas

AU - Richard, Terry G.

PY - 2004/11/1

Y1 - 2004/11/1

N2 - Background. Power hand tool use is considered a risk factor for upper extremity musculoskeletal disorders. It is unclear if submaximal eccentric activity inherent to power tool use adversely affects the mechanical properties of muscle. Methods. This study investigated in vivo changes in human upper limb dynamic mechanical properties following exposure to short-term repetitive submaximal eccentric exertions that are similar to operating an industrial power hand tool. Eighteen subjects (12 males and 6 females) were assigned to one of three exercise groups (isometric, eccentric or control) and exercised 10 min for 60 repetitions at 50% of isometric forearm supination maximum voluntary contraction. Supination strength and dynamic mechanical properties (stiffness, effective mass, and damping) of forearm rotation, modeled as a single-degree-of-freedom system during maximal exertion, were ascertained prior to exercise, immediately following exercise and 24 h later. Findings. Strength decreased for the isometric (17%) (P < 0.05) and eccentric (34%) (P < 0.01) groups following exercise. Only the eccentric exercise group had a reduction in mechanical stiffness (53%) (P < 0.01) and effective mass (58%) (P < 0.05). The other groups had no changes in mechanical properties. Interpretation. The change in mechanical properties following repetitive submaximal eccentric activity could negatively impact the ability of the arm to react to rapid forceful loading during repetitive industrial work activities and may indicate mechanical strain on the upper limb.

AB - Background. Power hand tool use is considered a risk factor for upper extremity musculoskeletal disorders. It is unclear if submaximal eccentric activity inherent to power tool use adversely affects the mechanical properties of muscle. Methods. This study investigated in vivo changes in human upper limb dynamic mechanical properties following exposure to short-term repetitive submaximal eccentric exertions that are similar to operating an industrial power hand tool. Eighteen subjects (12 males and 6 females) were assigned to one of three exercise groups (isometric, eccentric or control) and exercised 10 min for 60 repetitions at 50% of isometric forearm supination maximum voluntary contraction. Supination strength and dynamic mechanical properties (stiffness, effective mass, and damping) of forearm rotation, modeled as a single-degree-of-freedom system during maximal exertion, were ascertained prior to exercise, immediately following exercise and 24 h later. Findings. Strength decreased for the isometric (17%) (P < 0.05) and eccentric (34%) (P < 0.01) groups following exercise. Only the eccentric exercise group had a reduction in mechanical stiffness (53%) (P < 0.01) and effective mass (58%) (P < 0.05). The other groups had no changes in mechanical properties. Interpretation. The change in mechanical properties following repetitive submaximal eccentric activity could negatively impact the ability of the arm to react to rapid forceful loading during repetitive industrial work activities and may indicate mechanical strain on the upper limb.

KW - Forearm

KW - Mechanical properties

KW - Stiffness

KW - Submaximal eccentric exertions

UR - http://www.scopus.com/inward/record.url?scp=4744359770&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4744359770&partnerID=8YFLogxK

U2 - 10.1016/j.clinbiomech.2004.06.005

DO - 10.1016/j.clinbiomech.2004.06.005

M3 - Article

VL - 19

SP - 921

EP - 928

JO - Clinical Biomechanics

JF - Clinical Biomechanics

SN - 0268-0033

IS - 9

ER -