PMID 31983915

Research
All papers

Effects of high-intensity interval training on vascular function and maximum oxygen uptake in young sedentary females

Chidnok W, Wadthaisong M, Iamsongkham P, Mheonprayoon W, Wirajalarbha W, Thitiwuthikiat P, Siriwittayawan D, Vachirasrisirikul S, Nuamchit T

Question

Does 6 weeks of supervised cycling HIIT improve vascular function and cardiorespiratory fitness in sedentary young adults?

Summary

In sedentary young women, 6 weeks of supervised cycling HIIT improved flow-mediated dilation and VO2max within the HIIT group, and FMD was higher than control after training. The protocol was 25 minutes per session, three times weekly, with five 1-minute cycling bouts at at least 80% maximum heart rate separated by 2-minute recoveries.

Methodology

  • Sedentary healthy young women
  • 22 participants.
  • Cycle ergometer.
  • Work intervals: 1 minute.
  • Recovery: 2 minutes.
  • Intensity: At least 80% MHR.
  • 25 minutes.
  • 3 sessions per week.
  • 6 weeks.
  • Randomized controlled pilot intervention
  • FMD, CAVI, and VO2max were tracked.

Outcomes

FMD

HIIT improved FMD from baseline and had higher post-training FMD than control.

HIIT 9.26 +/- 6.5% to 14.01 +/- 4.3%, p<0.05; post HIIT vs control 14.01 +/- 4.3% vs 9.15 +/- 4.16%, p<0.05.

Improved

VO2max

VO2max increased significantly within the HIIT group.

20.10 +/- 4.31 to 24.34 +/- 5.71 ml/kg/min, p<0.05.

Improved

CAVI

CAVI improved within the HIIT group, while values remained in normal range.

5.91 +/- 0.58 after vs 6.22 +/- 0.86 before, p<0.05; abstract reports 6.39 +/- 0.76 vs 5.91 +/- 0.58.

Improved

Weight

Weight and BMI did not significantly change.

No clear change

Insights

  • A 5x1-minute cycling HIIT session can be time efficient and tolerable in screened sedentary young women.
  • Do not use this paper for weight-loss claims.

Limitations

  • Male participants dropped out
  • Small sample
  • No dietary control
  • Outside physical activity not reported

Safety

  • No injuries occurred.