e. 3. Resonance frequencies between 1- 20 Hz can cause the body to resonate leading to structural damage and health problems such as: a. Lower-back pain problems Vascular & neurological problems b. Spinal degeneration & neck problems f. All of the above C. Muscle fatigue a, b, c, d &e d. Gastro-intestinal tract problems h. a, b, c&d 6. The resonance frequency of the spinal column of a worker performing work in a seating position is between: a. 4-6 Hz d. 1-2 Hz b. 4-5% e. 3-4 Hz c. 3-5 Hz