4.3 Article

Time course of changes in (V) over doto2peak and O2 extraction during ramp cycle exercise following HIIT versus moderate-intensity continuous training in type 2 diabetes

出版社

AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpregu.00318.2020

关键词

cardiorespiratory fitness; exercise tolerance; high-intensity interval training; muscle deoxygenation; near-infrared spectroscopy

资金

  1. Health Research Board [08/RFP/BMT1342]
  2. Science Foundation Ireland (SFI) [08/RFP/BMT1342] Funding Source: Science Foundation Ireland (SFI)

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Both low-volume high-intensity interval training (HIIT) and moderate-intensity continuous endurance training (MICT) improved peak oxygen uptake (V O2peak) in adults with uncomplicated type 2 diabetes in a similar time course, with likely improvements due to enhanced microvascular oxygen delivery.
In the present study, we assessed the time course of adaptations in peak oxygen uptake ((V) over dot(O2peak)) and muscle fractional oxygen (O-2) extraction (using near-infrared spectroscopy) following 12 wk of low-volume high-intensity interval training (HIIT) versus moderate-intensity continuous endurance training (MICT) in adults with uncomplicated type 2 diabetes (T2D). Participants with T2D were randomly assigned to MICT (n = 12, 50 min of moderate-intensity cycling) or HIIT (n = 9, 10 x 1 min at similar to 90% maximal heart rate) or to a nonexercising control group (n = 9). Exercising groups trained three times per week and measurements were taken every 3 wk. The rate of muscle deoxygenation (i.e., deoxygenated hemoglobin and myoglobin concentration, Delta[HHb + Mb]) profiles of the vastus lateralis muscle were normalized to 100% of the response, plotted against % power output (PO), and fitted with a double linear regression model. (V) over dot(O2peak) increased (P < 0.05) by week 3 of MICT (+17%) and HIIT (+8%), with no further significant changes thereafter. Total increases in (V) over dot(O2peak) posttraining (P < 0.05) were 27% and 14%, respectively. The %Delta [HHb + Mb] versus %PO slope of the first linear segment (slope1) was reduced (P < 0.05) beyond 3wk of HIIT and MICT, with no further significant changes thereafter. No changes in (V) over dot(O2peak) or slope1 were observed in the control group. Low-volume HIIT and MICT induced improvements in (V) over dot(O2peak) following a similar time course, and these improvements were likely, at least in part, due to an improved microvascular O-2 delivery.

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