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We examined the effect of training on oxygen uptake (V0_2) kinetic response to the exercise onset, using cross sectional model. Twenty male subjects (VO_2max range: 41 - 60 mL/min/kg) performed six-mi...nute cycle ergometer exercise at a work rate corresponding to 80% of the ventilatory threshold after three minutes of unloaded cycling. The responses in VO_2, heart rate (HR), cardiac output (Q), and deoxygenated Hb+Mb change (DeoxyHb) were determined from the data averaged from four repetitions, fitted with a mono-exponential model. The response time was assessed as the sum of delay and time constant (MET), which represents the time to reach 63% of the steady state response. The VO_2 MET (phase 2) significantly correlated with the HE MET (r= 0.55) and Q MET (r= 0.57). The DeoxyHb MET did not correlate with the VO2 MET in all subjects (r= 0.17), but correlated with the V02 MET in each swimmer and untrained group (r= 0.96, n= 6; r=0.73, n=7, respectively). It was suggested that responses of central circulation and local oxygen utilization affect individual VO_2 response in various training status.続きを見る
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