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Changes in force by repeated stretches of skeletal muscle in young and old female Sprague Dawley rats.

Authors
Williams-ME; Stauber-WT
Source
Aging 2000 Dec; 12(6):478-481
NIOSHTIC No.
20029515
Abstract
We examined whether the decline in isometric force and peak stretch force during repeated stretches of activated plantar flexor muscles was larger in old (24 months, N=5) compared with young (4 months, N=5) female Sprague Dawley rats. Thirty stretches were imposed on isometric contractions (stimulation time 1.9 s, rest periods 180 s) by ankle rotation from 90 degrees to 40 degrees at 50 degrees x s(-1). Even though muscle weights were similar [2094 +/- 54 (young) vs 2033 +/- 73 mg (old) (mean +/- SE)], the isometric force (IF) at 90 degrees before stretch 1 and peak stretch force (PSF) at 40 degrees for stretch 1 were lower in old rats [18.9 +/- 0.5 vs 15.5 +/- 1.4 N (p=0.024) and 25.8 +/- 1.3 vs 20.5 +/- 0.9 N (p=0.017)]. After the stretches, the IF deficit was similar [38.5 +/- 3.0% (young) vs 39.8 +/- 3.4% (old)] and did not recover after 1 hour of rest [35.1+/- 4.1% (young) vs 36.9 +/- 4.3% (old)]. The decline in PSF was/also similar [36.0 +/- 5.2% (young) vs 26.6 +/- 1.8% (old)]. Skeletal muscles of 24-month-old female Sprague Dawley rats were weaker than 4-month-old rats but had similar susceptibility to develop IF deficits after stretches of activated muscles.
Keywords
Laboratory-animals; Animals; Animal-studies; Muscles; Musculoskeletal-system-disorders; Skeletal-system-disorders; Skeletal-disorders
Contact
Department of Biochemistry, P.O. Box 9142, West Virginia University Health Sciences Center, Morgantown, WV 26506-9142
CODEN
AGNGET
Publication Date
20001201
Document Type
Journal Article
Funding Amount
868663
Funding Type
Grant
Fiscal Year
2001
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-002918
Issue of Publication
6
ISSN
0394-9532
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
Aging: Clinical and Experimental Research
State
WV
Performing Organization
West Virginia University, Morgantown, West Virginia
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