Increase in Neuromuscular Activity and Oxygen Uptake during Heavy Exercise

抄録

In order to examine the contribution of neuromuscular activity to the slow increase in VO₂ during heavy exercise, integrated electromyogram (iEMG) of dominant working muscle and VO₂, was compared in seven subjects during constant-load cycling exercise at the intensity of l0 % below and 30 % above ventilatory threshold (VT) for seven minutes. VO₂ and iEMG after 4th min in above VT test was significantly correlated (r=0.53, p<0.01) and t02/iEMG was constant after 4th min, indicating coupling of iEMG with VO₂. The results suggested that the slow increase in VO₂ during heavy exercise may result from the changes in the recruitment pattern of motorunits