Pure momentsof a maximum of 2.34N. m were loaded incrementally. Parameters of neutral zone(NZ)andrange of motion(ROM)were calculated.

• 所施加的最大纯力矩为2.；34N·m；用摄影记录各节段颈椎的运动；计算得到中性区 NZ(Neutral Zone)和运动范围 ROM(Range of motion)。