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Self-selected or fixed: is there an optimal rest interval for controlling intensity in high-intensity interval resistance training?

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Purpose

This study investigated the effects of different rest interval strategies during high-intensity interval resistance training (HIRT) on cardiorespiratory, perceptual, and enjoyment responses among trained young men.

Methods

Sixteen men experienced with HIRT underwent cardiopulmonary exercise testing and were familiarized with the exercises and HIRT protocol. On the subsequent three visits, interspaced 48–72 h, participants performed HIRT sessions with different rest intervals in a randomized order: 10 s and 30 s fixed rest intervals (FRI-10 and FRI-30), and self-selected rest interval (SSRI). Oxygen uptake (VO2), heart rate (HR), and recovery perception (Total Quality Recovery Scale) were measured during HIRT, while enjoyment responses (Physical Activity Enjoyment Scale) were assessed immediately after the sessions.

Results

The VO2 during exercise was greater in FRI-10 than FRI-30 (55% VO2max and 47% VO2max, respectively, p = 0.01), while no difference occurred between SSRI and bouts performed with fixed intervals (52% VO2max vs. FRI, p > 0.05). HR, excess post-exercise oxygen consumption (EPOC), recovery perception, and enjoyment responses were similar across conditions (p > 0.05).

Conclusion

Exercise intensity was not affected by the rest interval strategy. High exercise intensity was maintained in sessions performed with FRI or SSRI, without negative repercussions on the duration of training sessions and enjoyment responses after exercise sessions.

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Data availability

Raw data from this study are not publicly available but some data might be available upon reasonable request made to the corresponding author.

Abbreviations

ACSM:

American College of Sports Medicine

ANOVA:

Analysis of variance

CPET:

Cardiopulmonary exercise testing

CV:

Coefficient of variation

EPOC:

Excess post-exercise oxygen consumption

FRI:

Fixed rest interval

HR:

Heart rate

HIIT:

High-intensity interval training

HRmax :

Maximum HR

VO2peak :

Maximum oxygen uptake

MICT:

Moderate-intensity continuous training

VO2 :

Oxygen uptake

PACES:

Physical activity enjoyment scale

SSRI:

Self-selected rest intervals

TQR:

Total Quality Recovery Scale

References

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Author information

Authors and Affiliations

Authors

Contributions

AF and WM were involved in the conception and design of the research; AF, RP, GMR, and LMS collected the data; PF, BRRO, and WM analyzed the data; AF, PF, and WM drafted the manuscript. All authors critically revised the manuscript and approved its submission.

Corresponding author

Correspondence to Walace Monteiro.

Ethics declarations

Conflict of interest

All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript.

Ethical approval

This study was performed in line with the principles of the Declaration of Helsinki and was approved by the Institutional Research Ethics Committee of Salgado de Oliveira University (CAAE: 08275619.6.0000.5289).

Consent to participate

Informed consent was obtained from all participants included in the study.

Additional information

Communicated by William J. Kraemer.

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Cite this article

Fidalgo, A., Farinatti, P., Matos-Santos, L. et al. Self-selected or fixed: is there an optimal rest interval for controlling intensity in high-intensity interval resistance training?. Eur J Appl Physiol 123, 2307–2316 (2023). https://doi.org/10.1007/s00421-023-05246-9

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  • DOI: https://doi.org/10.1007/s00421-023-05246-9

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