Optimization-based biomechanical evaluation of isometric exertions on a brake wheel
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The experiment investigated the effects of general body posture, left hand grip, subject anthropometry, and hand brake torque level upon predicted compressive force at L3/L4. An analysis of variance revealed that compressive force was significantly affected by each of the experimental variables. Additional analyses at subjects' maximum voluntary torque levels indicated that compressive force would exceed NIOSH guidelines for low-back compressive force, especially in males. Predicted L3/L4 compressive force at maximum torque ranged from an average of 2350N in small females to an average of 7485N for large males. We then used regression analysis to predict brake torque levels that would cause compressive force to exceed the NIOSH (1981) recommended maximum of 3400N. Based on the prediction methods used, hand brake torques of 40 to 80 Nm would be likely to cause compressive force to exceed this maximum.
- Masters Theses