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Influences of muscle fiber composition and strength on EMG, spinal motion, and load acceleration during a repetitive lifting task.

Authors
Cook-TM; Soderberg-GL
Source
Physical Therapy Education, University of Iowa, Iowa City, Iowa 1988 May; :1-80
Link
NIOSHTIC No.
00182727
Abstract
The changes which occur over time in the erector spinae muscles of the lower back in the instantaneous fatigue state were studied in relation to the selected kinematic and kinetic features of lifting. The influences of muscle fiber composition and lifting strength on changes in electromyographic activity (EMG), spinal motion, and load acceleration during this time period were investigated. A total of 24 male volunteers participated in the study. A great deal of variability was noted in regard to EMG amplitude and EMG center frequency from the L3 erector spinae musculature in regard to the range of motion of the lumbar segment, and in regard to the maximum vertical acceleration applied to the load being lifted. A significant relationship was noted between the EMG amplitude and EMG center frequency trends during repetitive lifting but not among these EMG measures and trunk range of motion, maximum load acceleration, height, or weight. A significant relationship was noted between lifting strength of the subject and the amount of trunk range of motion at the beginning of the lifting session and to the height and weight of the subject. Finally, significant relations were noted between muscle fiber composition and the maximum vertical acceleration applied to the load at the beginning of the lifting session.
Keywords
NIOSH-Grant; Musculoskeletal-system-disorders; Back-injuries; Humans; Repetitive-work
Contact
Physical Therapy Education University of Iowa S126 Westlawn Iowa City, Iowa 52242
Publication Date
19880501
Document Type
Final Grant Report
Funding Amount
68026
Funding Type
Grant
Fiscal Year
1988
NTIS Accession No.
PB89-131221
NTIS Price
A06
Identifying No.
Grant-Number-R01-OH-01929
NIOSH Division
OEP
Source Name
Physical Therapy Education, University of Iowa, Iowa City, Iowa
State
IA
Performing Organization
University of Iowa, Iowa City, Iowa
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