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Training Parameters and Adaptations That Mediate Walking Capacity Gains from High-Intensity Gait Training Poststroke.

Pierce Boyne1, Allison Miller, Sarah M Schwab-Farrell1

  • 1Department of Rehabilitation, Exercise and Nutrition Sciences, College of Allied Health Sciences, University of Cincinnati, Cincinnati, OH.

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|March 3, 2025
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Summary

Prioritize training speed and step count for improving walking capacity after stroke with high-intensity interval training (HIIT). These factors, not heart rate or lactate, most effectively enhance 6-minute walk distance (6MWD) gains.

Keywords:
AEROBIC EXERCISEHIITINTERVALLOCOMOTIONNEUROMUSCULARTREADMILL

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Area of Science:

  • Neurorehabilitation
  • Exercise Physiology
  • Stroke Recovery

Background:

  • Locomotor high-intensity interval training (HIIT) shows promise for improving walking capacity post-stroke.
  • Optimal training parameters for maximizing gains in walking speed and endurance remain unclear.
  • Gait adaptations versus cardiorespiratory changes as drivers of improvement need further investigation.

Purpose of the Study:

  • To identify which training parameters and longitudinal adaptations most significantly mediate 6-minute walk distance (6MWD) improvements following post-stroke HIIT.
  • To compare the mediating effects of various training variables on 6MWD gains.

Main Methods:

  • A randomized trial compared HIIT and moderate-intensity aerobic training (MAT) in 55 individuals with chronic stroke over 12 weeks.
  • Training involved overground and treadmill walking, 45 minutes, 3 times/week.
  • Structural equation models analyzed the mediating effects of training parameters and adaptations on 6MWD changes.

Main Results:

  • Faster training speeds and gait adaptations were the primary mediators of 6MWD gains with HIIT.
  • Higher training step counts, though lower in HIIT, were positively associated with 6MWD gains.
  • Training heart rate and lactate levels, as well as aerobic capacity gains, did not significantly correlate with 6MWD changes.

Conclusions:

  • Training speed and step count are crucial parameters to prioritize for enhancing walking capacity in post-stroke HIIT programs.
  • Gait adaptations, driven by faster training speeds, are key to improving 6MWD.
  • Focusing on these parameters may optimize rehabilitation outcomes for stroke survivors.