The objective of the present study was to assess the relationship of response time and peak latency of P300 with a simple-reaction task. Seven male subjects who were experienced players in decision-making sports were ...The objective of the present study was to assess the relationship of response time and peak latency of P300 with a simple-reaction task. Seven male subjects who were experienced players in decision-making sports were included. Two main findings were noted. First, the P300 latencies of Fz and Pz were correlated with visuo-motor related time. Second, in terms of latencies of visual evoked potentials, the correlations were observed only between Oz-P2 latency and visuo-motor related time. These results suggest that the length of visuo-motor related time is related to the processing involved in the higher order brain site involving specific processing in the visual cortex.展开更多
Enhanced physiological tremor (EPT) associated with fatiguing static muscle contractions is generally thought to limit continuous muscle work. However, the EPT dies away, allowing the continuous muscle contraction to ...Enhanced physiological tremor (EPT) associated with fatiguing static muscle contractions is generally thought to limit continuous muscle work. However, the EPT dies away, allowing the continuous muscle contraction to be maintained at low-level workload. Here, we report a case study of a 22-year-old male volunteer who performed static plantar flexion at 30% maximal voluntary contraction (MVC) for 66 min with repeated EPT events. Comparative analysis of 1 min pre- and post-EPT phases revealed lower electromyographic (EMG) activity, heart rate, and blood pressure levels during the post-EPT phases, while the popliteal artery blood-flow volume and vascular conductance were raised. EPT may therefore be a mechanism for removing factors that inhibit continuous muscle contraction. This unique case report provides new insight into the functional significance of EPT during prolonged static muscle contractions.展开更多
文摘The objective of the present study was to assess the relationship of response time and peak latency of P300 with a simple-reaction task. Seven male subjects who were experienced players in decision-making sports were included. Two main findings were noted. First, the P300 latencies of Fz and Pz were correlated with visuo-motor related time. Second, in terms of latencies of visual evoked potentials, the correlations were observed only between Oz-P2 latency and visuo-motor related time. These results suggest that the length of visuo-motor related time is related to the processing involved in the higher order brain site involving specific processing in the visual cortex.
文摘Enhanced physiological tremor (EPT) associated with fatiguing static muscle contractions is generally thought to limit continuous muscle work. However, the EPT dies away, allowing the continuous muscle contraction to be maintained at low-level workload. Here, we report a case study of a 22-year-old male volunteer who performed static plantar flexion at 30% maximal voluntary contraction (MVC) for 66 min with repeated EPT events. Comparative analysis of 1 min pre- and post-EPT phases revealed lower electromyographic (EMG) activity, heart rate, and blood pressure levels during the post-EPT phases, while the popliteal artery blood-flow volume and vascular conductance were raised. EPT may therefore be a mechanism for removing factors that inhibit continuous muscle contraction. This unique case report provides new insight into the functional significance of EPT during prolonged static muscle contractions.
