TY - JOUR
T1 - Effect of reaction time condition on EMG activities of the biceps brachii muscle in elbow flexion and forearm supination.
AU - Mojica, J. A.
AU - Nakamura, R.
AU - Yamada, Y.
AU - Tsuji, I.
PY - 1988/12
Y1 - 1988/12
N2 - Under simple- and choice-RT conditions, the biceps brachii muscle was examined in 8 healthy male subjects to determine how the temporal and spatial characteristics of elbow flexion and forearm supination differed at the initial phase of EMG activity and whether preparation or the presence of response uncertainty influenced the EMG outputs of the two movements. In the simple-RT condition, RT of supination was significantly faster than that of flexion but EMG activity of supination was less than that of flexion. In contrast, in the choice-RT condition, RT of flexion was significantly faster than that of supination but EMG activity of flexion was significantly reduced compared to supination. These findings indicate that advanced preparation or motor set facilitates the differentiation of RTs and EMG activities of the response movements and that response uncertainty causes a significant change in the temporal and spatial specificity of both elbow flexion and forearm supination.
AB - Under simple- and choice-RT conditions, the biceps brachii muscle was examined in 8 healthy male subjects to determine how the temporal and spatial characteristics of elbow flexion and forearm supination differed at the initial phase of EMG activity and whether preparation or the presence of response uncertainty influenced the EMG outputs of the two movements. In the simple-RT condition, RT of supination was significantly faster than that of flexion but EMG activity of supination was less than that of flexion. In contrast, in the choice-RT condition, RT of flexion was significantly faster than that of supination but EMG activity of flexion was significantly reduced compared to supination. These findings indicate that advanced preparation or motor set facilitates the differentiation of RTs and EMG activities of the response movements and that response uncertainty causes a significant change in the temporal and spatial specificity of both elbow flexion and forearm supination.
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U2 - 10.2466/pms.1988.67.3.807
DO - 10.2466/pms.1988.67.3.807
M3 - Article
C2 - 3226831
AN - SCOPUS:0024220845
VL - 67
SP - 807
EP - 813
JO - Perceptual and Motor Skills
JF - Perceptual and Motor Skills
SN - 0031-5125
IS - 3
ER -