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Physical Adaptations to High-Intensity Multimodal Training in Recreationally Active Adults: A Randomised Control

Tijana Sharp1,2, Katie Slattery1,2, Samuel Higham1,2

  • 1School of Human Performance, Rehabilitation and Population Health, Faculty of Health, University of Technology Sydney, Moore Park, Sydney, Australia.

European Journal of Sport Science
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

High-intensity multimodal training (HIMT) and inter-session concurrent training (ISCT) both enhance strength and aerobic fitness. ISCT showed a slight edge in reducing body fat percentage over seven weeks.

Keywords:
aerobic fitnessbody compositionconcurrent traininghigh‐intensity multimodal trainingmuscular strength

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • High-intensity multimodal training (HIMT) integrates aerobic and resistance exercise in one session, offering time efficiency.
  • The comparative efficacy of HIMT versus other combined training models, like inter-session concurrent training (ISCT), for physical adaptations is not well-established.

Purpose of the Study:

  • To compare the physical adaptations resulting from 7 weeks of HIMT against a matched ISCT program in recreationally active adults.
  • To determine if integrating exercise types within a single session (HIMT) is as effective as separating them across different sessions (ISCT).

Main Methods:

  • A randomized controlled trial involving 7 weeks of training.
  • Two groups: HIMT (4 sessions/week, integrated aerobic/resistance) and ISCT (4 sessions/week, 2 resistance + 2 aerobic).
  • Training intensity was high (≥7 RPE CR-10), with matched weekly volume and exercise selection.

Main Results:

  • Both HIMT and ISCT groups showed significant improvements in maximal strength, aerobic capacity (peak oxygen uptake), and maximum work rate.
  • Both training models led to significant, albeit trivial, improvements in body composition metrics including fat mass, lean mass, and waist circumference.
  • A statistically significant interaction favored ISCT for a slightly greater reduction in body fat percentage.

Conclusions:

  • Seven weeks of both HIMT and ISCT effectively improve muscular strength, aerobic fitness, and body composition in recreationally active adults.
  • Separating high-intensity aerobic and resistance exercise sessions across different days (ISCT) may provide a marginal benefit for reducing body fat percentage.
  • Longer intervention periods might be necessary to observe more substantial adaptations from either training modality.