Abstract
The purpose of this project was to determine the reliability of commonly used indices of anaerobic fatigue. Eight normal subjects (2 male, 6 female) with an average age of 38 ± 9.4 years participated in this study. Six trials of maximal elbow flexion were performed using a dynamometer with the elbow in 60° of flexion and the forearm in supination. The isometric fatigue test was 120 sec in duration and the isokinetic fatigue test featured 75 maximal repetitions (for 225 sec) at 180°/sec. Test-retest reliability was determined using intraclass correlation coefficients (ICC 3,1). Pearson correlations (r) were used to determine the relationship between muscle performance measures. Total impulse, total work, total impulse index (TII), MVC, and last third/first third impulse index (LFII) were very reliable (ICCs of 0.88 - 0.99). The total work index (TWI) and last third/first third work index (LFWI) displayed moderate to poor reliability with ICCs of 0.67 and 0.59 respectively. MVC was highly correlated with total impulse and total work (r = 0.95, p = 0.01), but not LFII (r = 0.24, p = 0.5), TWI (r = −0.54, p = 0.35) or TII (r = −0.32, p = 0.45). Rate of isokinetic and isometric fatigue had good correlation with total work (r = 0.78, p = 0.05) and impulse (r = 0.77, p = 0.05). LFII was poorly correlated with the TII (r = 0.11, p = 0.80). TII and LFII group mean values were 48.05% ± 5.8 (range 41–59%) and 48.97% ± 18.4 (range 14–71%) respectively. The data suggest that isometric tests may be more reliable than isokinetic tests in the assessment of anaerobic fatigue during maximal elbow flexion. Total work and impulse may represent anaerobic capacity based on their strong relationship with fatigue rate and MVC. TII and LFII have similar group mean values, but a weak relationship as they measure different components of fatigue. Force-time curve analysis reveals that TII may be a more general measure of fatigue, but less influenced by task strategy, than the LFII. LFII should not be used independent of TII.
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