method to evaluate the sincerity of the muscular maximal effort performed in a dynamometric isokinetic test of knee flexion-estension. The coefficient of variation of the peak torque (CV) and 3 new indices were analysed: 1) the average coefficient of variation calculated on the complete peak torque curve (CVM); 2) the slope of the regression line in an endurance test (PRR); 3) the correlation coefficient of the peak torques in the same endurance test (CCR). Twenty healthy subjects underwent assessment in two different trials, maximal (MX) and 50% submaximal (SMX), with 20 minutes of rest between trials. Each trial consisted of 4 tests, each of 3 repetitions, at angular speed of 30, 180, 30, and 180°/s, respectively, and 1 test of 15 repetitions at 240°/s. Our findings confirmed the ability of CV to detect a high percentage of sincere efforts: at 30°/s Sensibility (Sns)=100% and Specificity (Spc)=70%; at 180°/s Sns=75%, Spc=95%. The 3 new indices here proposed showed high characteristics of Sns and Spc, generally better than those of CV. CVM showed at 180°ls Sns=90% and Spc=100%, while at 30°ls Sns=90%, Spc=75%, PRR was the best index identifying all the efforts, except one (Sns=100%, Spc=95%). The CCR coefficient showed Sns and Spc values both of 90%.
|Translated title of the contribution||Sincerity of effort: Isokinetic evaluation of knee extension|
|Number of pages||7|
|Journal||Giornale Italiano di Medicina del Lavoro ed Ergonomia|
|Publication status||Published - Oct 2008|
ASJC Scopus subject areas
- Public Health, Environmental and Occupational Health