Influence of Exchanged Neuromuscular Regulation of M.Gastrocnemius on Leg Bloodflow Regulation During Static Voluntary Contraction of Knee Flexors

Abstract In literature from 1970th are described experimentaly proved concept of muscle local blood flow redistribution to capillaries feeding active muscle fibres, and loss of this synhrone blood flow redistribution with changes of recruited motor units, caused by mechanical, metabolic or neural regulatory disturbances. On the other hand, from theory of applied kinesiology (AK) it is known that different external or internal challenges coud exchenge neuromuscular regulation and muscle could become weak-testing or become hypertonic. The physiological background of these changes is not jet known. The aim of this study is to find out connections between muscle's neuromuscular regulation and its local blood flow regulation. We investigate blood flow regulation in the leg during static voluntary contraction with contraction force 5% of the knee flexor muscle maximal static voluntary contraction (MVC) in position with knee flexed till 60 deg. In this experiment participate 8 LASE students in age 22-24 with normotonic m. gastrocnemius and 8 LASE students in age 22-26 with weak-tested m. gastrocnemius. Muscle tests were performed according AK testing methode (Frost, 2002.). Leg blood flow was measured with a mercury-in-silastic strain-gauge plethismograph, using the venous-occlusion plethismography Hokanson AI6 (Hokanson, Sumner and Strandness, 1975). Cycle of leg blood flow measurement was 15 seconds repeated twice in every controled minute. Student paired t-test was used to evaluate diferences in the results of blood flow measurements from strong tested and weak tested leg muscles. We find statistically significant (P>95) differences triceps surae during static contraction with contracting force of knee flexors 5% MVC. Volume blood flow in leg with exchanged neuromuscular regulation of knee flexors where statisticaly higher neither blood floww in leg with normal neuromuscuular regulation. These differences was observed all the time of the static contraction. Changes of neuromuscular regulation could cause muscles local blood flow regulatory disturbances. Character of muscle local blood flow could be a quantitatively measurable parameter which reflects changes of neuromuscular regulatory processes of studied muscle.