Issn Print: 0195-9131
Publication Date: 2002/05/01
GENERALIZABILITY OF PERCENT MAXIMUM FUNCTIONAL LIFT CAPACITY
Excerpt
Previous research from our lab (2001) has demonstrated that ratings of perceived exertion could be translated into the physiological meaningful scale of percentage of maximum functional lift capacity (PMFLC) for floor-to-knuckle height lifts (R = 0.91, SEE 8.5). The purpose of this study was to determine the validity of this model in determining PMFLC for floor-to-shoulder height lifts. The lift capacity of 16 female and 15 male subjects was determined with multiple floor-to-shoulder height lifts with weight loads ranging from 8 kg (17.6 lb) to 53 kg (116.6 lb). Each lift was rated psychophysically with Borg's CR-10 scale. Using the subject's lift weightas the independent variable and the CR-10 rating as the dependent variable, power function analysis modeled each subject's psychophysical dynamic lift profile. Maximum functional lift capacity (MFLC) was estimated using each subject's dynamic lift profile, and was operationally defined as the lift weight equal to a CR-10 ratin of 10. Each subject's PMFLC was computed as the ratio of a randomly selected lift weight within the subject's lift profile and their MFLC weight. The previously validated model was then used to estimate PMFLC, using the following equation: PMFLC = 24.69 + 8.9(CR-10) û 0.15(CR-10 x CR-10). The correlation between actual and predicted PMFLC was 0.92. The quadratic equation (R = 0.93, SEE = 10.0) for floor-to-shoulder height lifts was similar: 20.93 + 5.2(CR-10) − .2(CR-10 × CR-10) to the previously developed equation. The high correlation between estimated and actual PMFLC values supports the generalizability of the PMFLC model to floor-to-shoulder height lifts. These results support the use of percentage of maximum functional lift capacity as an ergonomic work intensity scale.
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