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Updated: Mar 21, 2026

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Does Concurrent Training Intensity Distribution Matter?

Adrián Varela-Sanz1, José L Tuimil, Laurinda Abreu

  • 11Department of Physical Education and Sport, University of La Coruña, Bastiagueiro, Spain; 2Independent Researcher, Vigo, Spain and 3Post-Graduate Program in Physical Education, Catholic University of Brasilia, Brasilia, Brazil.

Journal of Strength and Conditioning Research
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Concurrent training (CT) intensity distribution impacts adaptations. Polarized training (PT) and traditional training (TT) showed similar fitness gains, but PT better preserved jumping ability. Both methods are effective for improving strength and aerobic capacity.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Training Adaptations

Background:

  • Intensity distribution significantly influences endurance training adaptations.
  • The impact of intensity distribution on concurrent training (CT) effectiveness remains under-researched.
  • Understanding optimal CT strategies is crucial for enhancing athletic performance.

Purpose of the Study:

  • To compare the effects of two distinct CT intensity distributions on physical fitness.
  • To evaluate the impact of traditional-based training (TT) versus polarized training (PT) on strength, power, and aerobic capacity.
  • To assess the influence of different CT protocols on heart rate variability (HRV) and body composition.

Main Methods:

  • Thirty-one sport science students participated in an 8-week training intervention.
  • Participants were assigned to either a TT group, a PT group, or a control group (CG).
  • Evaluations included HRV, jump performance, strength tests (bench press, half squat), and maximum aerobic speed (MAS).

Main Results:

  • Both TT and PT groups demonstrated comparable improvements in MAS, bench press, and half squat performance.
  • The PT group maintained jump capacity, unlike the TT group, despite increases in body mass and BMI.
  • No significant changes in HRV were observed, though the TT group showed a reduction in resting heart rate.

Conclusions:

  • Polarized training (PT) and traditional training (TT) yield similar improvements in physical fitness for active individuals.
  • PT demonstrates a lower interference effect on jumping capacity compared to TT, even with increased body mass.
  • Further research is needed to elucidate the dose-response relationship of varying CT intensity distributions across diverse populations.