Reliability of isometric force-time curve parameters for men aged 20 to 79 years
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CONTRIBUTORS:
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JOURNAL:
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YEAR:
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1992
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PUB TYPE:
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Journal Article
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SUBJECT(S):
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AGING; AGE-FACTOR; MAN; STRENGTH; MUSCLE-CONTRACTION
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DISCIPLINE:
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No discipline assigned
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HTTP:
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LANGUAGE:
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English
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PUB ID:
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103-365-282
(Last edited on
2002/02/27 18:45:07 US/Mountain)
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SPONSOR(S):
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ABSTRACT:
The purpose of this study was to examine the reproducibility of age-related muscle force production. Four force-time parameters (maximal force, maximal rate of force production, time to maximal force and total impulse) were recorded from 155 men aged 20 to 79 years (20-23, 25-29, etc.). Subjects were tested on five muscle groups (finger flexors, thumb abductors, forearm extensors, dorsiflexors and plantar flexors), performing three maximal isometric contractions on each of two days for a total of six trials. The two days of testing were separated by at least 24 hours and the testing order was randomized each day. After each subject became familiar with each muscle group test, the overall reproducibility for each variable representing muscle function was established with a 2 by 3 repeated measures analysis of variance design. Day-to-day reliability was evaluated by Pearson correlation coefficients and paired t-tests. The statistical analyses were performed separately for each muscle group and each five-year age group as well as for each muscle group across all age groups. Based on the total number of significance tests performed, muscle groups, age groups and muscle function variables, only 78 out of 540 tests (14 percent) were significant. Thumb abduction occasionally presented significant differences between days perhaps resulting from the novelty of the task. Trial-to-trial reliability was good, although force did tend to increase slightly over the last two trials each day. This was most generally true for dorsiflexion and plantar flexion, with no evident pattern concerning age. When the day-to-day reliability of each muscle group was evaluated, independent of age group, the plantar flexors produced the most reliable data while the thumb abductors produced the lowest coefficients, although still very acceptable. It was concluded that the average of six isometric trials over two days provided a more stable measure of muscle function than just one day of testing, especially when testing older individuals. Reliability appears to be influenced by the particular muscle group being tested as well as the particular variable being considered. Finally, maximal forces and other force-time parameters were consistently reached even by the oldest men, allowing for the characterization of muscle function of each five-year age group through age 79.
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