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|Title:||Consistency in Pattern of 60 Second, Continuous Maximal Static Contractions in Three Muscle Groups of Young Men Tested Over Four Days|
|Author(s):||Ball, Thomas Edward|
|Department / Program:||Physical Education|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|Abstract:||The purpose of this study was to (1) determine the consistency in pattern over days (n = 4) of a continuous maximal voluntary isometric contraction (cmvic) held for 60 seconds; (2) determine whether the pattern of force production for a cmvic is similar across muscle groups or unique to a muscle group; (3) determine the relationship amongst indexes reflecting fatigue measured from the force fatigue curve. Subjects (n = 64) were males, 18 to 30 years of age. The subjects reported to the laboratory on four occasions separated by at least 48 hours. During each test session, subjects were tested to determine the strength and endurance capacity of three muscle groups, the thumb abductors (TA), forearm extensors (FE), and plantar flexors (PFl), all tested daily for four test sessions. Digitized force fatigue curves were analyzed to determine fourteen force and time variables, peak force (PF), final force (FF), total impulse (TI), percent total impulse (PTI), fatigable work (FW), percent decrement at 15 (PD15), 30 (PD30), 45 (PD45), and 60 (PD60) seconds from peak force, time to a force decrement of 10 (T10), 20 (T20), 30 (T30), and 40 (T40) percent of peak force, and the maximal rate of force decrement (MR) during a 500 millisecond interval.
The data were analyzed using a repeated measures ANOVA, intraclass correlation coefficients, and Peason product-moment correlations. The results of the analysis revealed that the variables were, in general, very consistent over days (R = .59 to .98). The measures of raw force output, PF, TI, and FF gave the highest reliabilities (R = .90 to .98). Indexes reflecting fatigue or endurance were more variable, but still yielded good reliability (R = .59 to .90). There were few significant between day differences as shown by the repeated measures ANOVA, indicating that the measures were quite reproducible over days.
The ANOVA comparing muscle groups showed that there were highly significant differences between the muscle groups (p < .01) in all cases. Comparisons between the muscle groups revealed that the PFL had greater endurance capacities than either the TA or FE (p < .05) in all cases except the comparison of PD15 for the FE and PFL. The FE showed greater endurance than the TA in all cases (p .05) except T10, where there was no difference, and PD60, where the FE force dropped off more than the TA force (57% vs. 53%).
Pearson product-moment correlation coefficients intercorrelating the fatigue indexes revealed that there was little overlap of information, the indexes were not redundant, with the exception of PF and TI (r = .91 to .96), and PD45 with PD60 (r = .86 to .90).
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1986.
|Date Available in IDEALS:||2014-12-16|