A study of different postures on isometric lifting strength in normal college students.

The purpose of this study was to describe norms of isometric lifting strength for normal college students and to investigate the effects of gender, body weight, height, and upper and lower limb length on lifting strength. Three types of lifting (i.e., arm, back, and leg lifting) were measured in a sample of 104 college students aged between 18 and 26 years. A Force Evaluation and Testing System (FET 5000) was used for strength measurements with three standard lifting positions. The average of three trials for each lifting strength test was used as the subject's test score. The results showed that the highest mean lifting strength was recorded for leg lifting in both males and females. Both groups also had the lowest score in arm lifting. Of the total sample, there was a difference of strength of nearly three- times between leg and arm lifting. Males were stronger than females in all lifting patterns. In addition, lifting strengths were significantly affected by such variables as sex, weight and height. Body weight was an effective predictor of arm lifting strength, and height an effective predictor of leg lifting strength. Finally, we found that strength in one position had positive relations with strength in other positions. These findings and the establishment of data base can in future provide therapists with an objective evaluation regarding lifting strength of individuals for clinical use.