Skip to main content
OpenTrials
Completed

NCT Number: NCT06912932

Physiological and Perceptual Responses During 4-Second Exercise

The purpose of this study is to investigate the acute effects of different intensities (i.e., 50, 75, and 100% of maximal anaerobic power) of 4-s sprint interval exercise on physiological responses. Secondly, it will determine the relationship between intensity and recovery duration (i.e., 15, 30, or 45-s) that will stimulate the cardiovascular and metabolic systems.

Completed

Looking for future studies?

Notify Me

Key information

Conditions

Cardiovascular Fitness Behavior Motor Activity

Age range

18 year–30 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Human Performance Laboratory, Department of Kinesiology and Health Education, the University of Texas at Austin

Austin, Texas, 78712, United States

About this study

Background Short sprint interval training (sSIT) is typically performed at maximal intensity, generating power far above what is needed to reach peak oxygen consumption (VO₂peak). However, the physiological effects of submaximal sprint intensities and different recovery periods are not well understood.

Study Aim This study examined how power output and oxygen consumption (VO₂) respond to repeated 4-second sprints at 50%, 75%, and 100% of maximal power (Pmax) with rest periods of 15, 30, or 45 seconds.

Methods Eleven recreationally active participants completed nine trials, each consisting of thirty 4-second cycling sprints under different intensity and recovery conditions.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Young (18-30),
  • Healthy,
  • Recreationally active, but untrained (not meeting ACSM's recommendations of 150 min/week of moderate-vigorous aerobic exercise)

Exclusion criteria

  • Cardiovascular disease
  • Smoking
  • Subjects who were exercising regularly (>75 min/week) were excluded.

Treatment and study plan

Preventive

Behavioral

systematically investigate the acute physiological responses induced by three levels of %Pmax intensities (50% and 75% of Pmax and all-out efforts) with three varying rest periods (15, 30, and 45-s) between thirty 4-s sprints.

Primary outcomes

  1. Cardiovascular changes

    Time frame: From enrollment (Day 1) to the end of treatment (9 trials) (Day 11), through study completion, an average of 5 weeks.

    The %VO2peak associated with repeated submaximal power sprints (%Pmax), particularly when paired with varying rest periods, remains unknown. The aim of this study was to systematically investigate the cardiovascular changes for better exercise programming, measured in mL/min/kg.

Sponsors and collaborators

Lead sponsor

University of Texas at Austin

Other

Registry information

Official study title

The Effects of The Exercise Intensity and Rest Duration on Physiological and Perceptual Responses During 4-Second Sprint Interval Exercise

Important dates

Study start
2023
Primary completion
2024
Study completion
2024
First posted
Apr 6, 2025
Registry last updated
Apr 6, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Related clinical trials

Published trials that share one or more normalized conditions with this study.