Thus , along with the voluntary contraction , this therapy provides improved motor control and strengthening exercises , to increase the range of activation of muscle spindles triggering the tonic vibration reflex ( BOSCO ; CARDINALE ; TSARPELA , 1999; Rittweger ; BELLER ; Felsenberg , 2003; Curry ; Clelland cited DIEEN ; SELEN ; CHOLEWICHI , 2003; SILVA ; Couto ; SZMUCHROWSKI , 2008) . For present inability to generate muscle strength needed to avoid instabilities in the affected segments , the vibration becomes a relevant resource in the treatment for chronic low back pain and disc herniation ( YILMAZ et al . , 2003) .