Purpose:
\nIn this study, we investigated the effects of vibration of the whole lower leg on the content and the oxygenation of hemoglobin in the unloaded relaxed lateral gastrocnemius muscle. Vibration was applied orthogonal to and in parallel with leg axis to examine whether the extrusion of blood depends on an alignment of main vessel direction,axis of vibration and gravity.
\nMethod:
\nThe blood volume in the muscles was altered by horizontal and 30\u00b0 upright body posture. Fifteen male subjects were exposed to 4 sets of experiments with both vibration directions and both tilt angles applied in permutated order. The absence of voluntary muscular activity and
\nthe potential occurrence of compound action potentials by stretch reflexes were monitored using electromyography. Total hemoglobin and tissue saturation index were measured with near infrared spectroscopy. Changes of lower leg circumference were measured with strain gauge system placed around the calf.
\nResult:
\nVibration caused decrease in tHb and increase in TSI indicating extrusion of predominantly venous blood from the muscle. In 30\u00b0 tilted position, muscles contained more blood at baseline and vibration ejected more blood from the muscle compared with horizontal posture
\n(p < 0.01). At 30\u00b0 tilting deeper drop in tHb and steeper increase in TSI (p < 0.01) were observed when vibration was applied in parallel with the length axis of muscle.\nConclusion:\nIt is concluded that the vibration extrudes more blood in 30\u00b0 head up posture and the vibration applied in parallel with the length axis of the muscle is more effective than orthogonal vibration.\n<\/p>\n","protected":false},"excerpt":{"rendered":"
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