Relationship Between Hamstring Flexibility and Extensor Muscle Activity During a Trunk Flexion Task.

Objective: The purpose of this study was to investigate the relationship between hamstring flexibility and electromyography (EMG) muscle parameters in back and lower limb extensor muscles during a trunk flexion task.

Methods: Thirty healthy women aged 18 to 30 years with normal hip movement were recruited for this study. Hamstring muscle flexibility was measured with the 90-90 active straight leg raise test.