Neural control of the soleus H-reflex correlates tothe laterality pattern in limbs  

作　　者：Dorota Olex-Zarychta 

机构地区：[1]Department of Theory and Methodology of Physical Education,Academy of Physical Education

出　　处：《Neural Regeneration Research》2010年第5期390-395,共6页中国神经再生研究（英文版）

基　　金：a Grant from the Ministry of Science and Higher Education of Poland, No. N 404 045 31/2332

摘　　要：BACKGROUND： Previous studies have demonstrated the relationship of lower limb dominance with left- and right-handedness, supporting findings suggest that there is a role for peripheral factors in the neural control of movement. OBJECTIVE： To investigate the effect of laterality pattern on the neural mechanisms of motor control at the peripheral level. DESIGN, TIME AND SETTING： A controlled observation experiment was performed at the Motor Diagnostics Laboratory of the Academy of Physical Education in Katowice, Poland, in June 2009. PARTICIPANTS： Twenty young male adults aged 21-23 years and presenting two laterality patterns in hand-foot combination （right handed-right footed and left handed-left footed groups） took part in the experiment. All participants were carefully screened to eliminate any neurological or muscle disease or trauma. METHODS： The experiment included a laterality evaluation and the motor evoked potentials of dominant and non-dominant limbs. Measures were done through the use of the Hoffmann-reflex （H-reflex） circuitry. The soleus H-reflex parameters elicited at rest in lower extremities were compared. The soleus H-reflex and the direct motor response were elicited in lower extremities of each participant in the same laboratory session. MAIN OUTCOME MEASURES： Onset latencies and min-max amplitudes of the direct motor response and the H-reflex; the motor and sensory conduction velocities; and symmetry coefficients of response parameters. RESULTS： The analysis of symmetry coefficients of direct and late motor responses confirmed differences between two laterality patterns in amplitude and latency of the H-reflex as well as in a sensory conduction velocity （P 〈 0.05）, but not in direct motor response parameters. The amplitude of the H-reflex and the calculated sensory la afferent conduction velocity in the dominant lower extremity were significantly depressed in the right-sided group in comparison to the left-sided group （P = 0.001）. The right-sided group presented BACKGROUND： Previous studies have demonstrated the relationship of lower limb dominance with left- and right-handedness, supporting findings suggest that there is a role for peripheral factors in the neural control of movement. OBJECTIVE： To investigate the effect of laterality pattern on the neural mechanisms of motor control at the peripheral level. DESIGN, TIME AND SETTING： A controlled observation experiment was performed at the Motor Diagnostics Laboratory of the Academy of Physical Education in Katowice, Poland, in June 2009. PARTICIPANTS： Twenty young male adults aged 21-23 years and presenting two laterality patterns in hand-foot combination （right handed-right footed and left handed-left footed groups） took part in the experiment. All participants were carefully screened to eliminate any neurological or muscle disease or trauma. METHODS： The experiment included a laterality evaluation and the motor evoked potentials of dominant and non-dominant limbs. Measures were done through the use of the Hoffmann-reflex （H-reflex） circuitry. The soleus H-reflex parameters elicited at rest in lower extremities were compared. The soleus H-reflex and the direct motor response were elicited in lower extremities of each participant in the same laboratory session. MAIN OUTCOME MEASURES： Onset latencies and min-max amplitudes of the direct motor response and the H-reflex; the motor and sensory conduction velocities; and symmetry coefficients of response parameters. RESULTS： The analysis of symmetry coefficients of direct and late motor responses confirmed differences between two laterality patterns in amplitude and latency of the H-reflex as well as in a sensory conduction velocity （P 〈 0.05）, but not in direct motor response parameters. The amplitude of the H-reflex and the calculated sensory la afferent conduction velocity in the dominant lower extremity were significantly depressed in the right-sided group in comparison to the left-sided group （P = 0.001）. The right-sided group presented

关 键 词：Hoffmann-reflex LATERALITY motor control neural circuitry human peripheral factors 

分 类 号：R741[医药卫生—神经病学与精神病学]