from these results we infer that a muscle 's emg activity was determined by 1 ) passive elastic properties of the wrist and the active length-tension characteristics of the muscle itself ( position ) , 2 ) asymmetries in the muscle 's contractile force depending on whether it was lengthening or shortening ( direction ) , and 3 ) magnitude of the external torque load ( force ) .
C1444754
length
C1521970
characteristics