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High-Intensity Interval Exercise and Postprandial Triacylglycerol.

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High-intensity interval exercise (HIIE) shows potential for reducing postprandial triacylglycerol (TAG) levels, though results vary. Further research is needed to clarify optimal protocols for consistent TAG reduction.

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Area of Science:

  • Exercise Physiology
  • Metabolic Health
  • Cardiovascular Research

Background:

  • Elevated postprandial triacylglycerol (TAG) is a risk factor for cardiovascular disease.
  • High-intensity interval exercise (HIIE) is increasingly studied for its metabolic benefits.
  • Understanding HIIE's impact on postprandial TAG is crucial for exercise prescription.

Purpose of the Study:

  • To systematically review the existing literature on the effects of HIIE on postprandial TAG levels.
  • To analyze findings based on exercise intensity (supramaximal vs. submaximal) and volume.
  • To identify inconsistencies and propose future research directions.

Main Methods:

  • A systematic review of 15 studies evaluating HIIE (>65% maximal oxygen uptake) and postprandial TAG.
  • Studies were categorized based on the inclusion of supramaximal sprints or submaximal interval exercise.
  • Data analysis focused on changes in postprandial TAG area under the curve.

Main Results:

  • Low-volume supramaximal HIIE showed inconsistent reductions in postprandial TAG (10-21% in 7/10 studies).
  • High-volume submaximal interval exercise with high energy expenditure effectively reduced TAG (15-30% in 4/5 studies).
  • Inconsistencies may stem from protocol variations, individual differences, or insufficient time for lipase activity.

Conclusions:

  • Supramaximal HIIE may significantly reduce postprandial TAG, but findings lack consistency.
  • Submaximal interval exercise offers no clear metabolic advantage over continuous aerobic exercise.
  • Further research should investigate 30-minute daily submaximal HIIE protocols for TAG reduction.