# Active Recovery Induces Greater Endurance Adaptations When Performing Sprint Interval Training

PMID: 30102686
Journal: Journal of strength and conditioning research
Published: 2019 Apr
Authors: Yamagishi T, Babraj J

## Question

Does recovery intensity change endurance adaptations during a two-week Wingate-based sprint interval training program?

## Summary

In active adults doing six sprint-interval cycling sessions over two weeks, active recovery at 40% VO2peak produced larger endurance-related adaptations than passive recovery. Both groups improved 10-km time-trial performance, but critical power and 3-minute work improved only with active recovery.

## Population

- Healthy active adults who performed at least 3 hours of exercise per week but were not regular sport competitors.
- Sample size: 14
- Age: 21-33 years
- Sex: 9 men and 5 women
- Fitness level: Active, non-competitive
- Health status: Healthy

## Methodology

- Matched-group controlled intervention
- 2-week training intervention after a 2- or 4-week control period
- University exercise laboratory cycling protocol
- Controlled study design.

## Protocol

- Active-recovery sprint interval training.
- Modality: Cycle ergometer Wingate sprints.
- Work intervals: 30 seconds.
- Recovery: 4 minutes cycling at 40% VO2peak.
- Sets or repetitions: 4-6 sprints per session.
- Intensity: All-out sprint against 7.5% body mass.
- Session duration: About 18-27 minutes for sprint and recovery block, depending on number of sprints.
- Frequency: 3 sessions per week.
- Program length: 2 weeks.
- Progression: 4 sprints in sessions 1-2, 5 in sessions 3-4, and 6 in sessions 5-6.
- Passive-recovery sprint interval training.
- Modality: Cycle ergometer Wingate sprints.
- Work intervals: 30 seconds.
- Recovery: 4 minutes stationary or unloaded cycling below 50 rpm.
- Sets or repetitions: 4-6 sprints per session.
- Intensity: All-out sprint against 7.5% body mass.
- Session duration: About 18-27 minutes for sprint and recovery block, depending on number of sprints.
- Frequency: 3 sessions per week.
- Program length: 2 weeks.
- Progression: Same sprint progression as active-recovery group.

## Outcomes

### Critical power
Status: improved
Critical power improved only in the active-recovery group.

Active recovery +7.9%, d=1.75, p=0.015; passive recovery unchanged.

### 10-km time trial
Status: improved
Both groups improved cycling time-trial performance.

Active recovery +8.6%, d=1.60, p=0.006; passive recovery +6.7%, d=0.96, p=0.048.

### 3-min work
Status: improved
Total work in the 3-minute test improved only with active recovery.

Active recovery +3.7%, d=1.84, p=0.022; passive recovery unchanged.

### VO2peak
Status: no clear change
VO2peak and HRmax did not significantly change in either group.

### Recovery demand
Status: improved
Active recovery increased aerobic and heart-rate demand during recovery periods without reducing sprint power.

Recovery VO2 p=0.005 and HR p=0.018 between recovery conditions.

## Practical Insights

- When using Wingate-style SIT for endurance, active recovery near 40% VO2peak may produce better endurance adaptations than passive recovery.
- The recovery interval can be an active training stimulus, not merely downtime.
- The protocol used specialist cycling equipment and all-out efforts, so it is best translated cautiously for general users.

## Limitations

- Small sample of 14 active adults.
- Group assignment was matched by baseline values but randomization was not clearly reported.
- Short two-week intervention.
- Cycling laboratory protocol may not generalize to bodyweight or unsupervised HIIT.

## Safety And Adherence

- One passive-recovery participant reported discomfort and nausea from the gas analyzer during training measurement, so cardiorespiratory data for that group were n=6.
- No formal adverse-event rates were reported.

## Original Sources

- [PubMed](https://pubmed.ncbi.nlm.nih.gov/30102686/) (pubmed)
- [DOI](https://doi.org/10.1519/JSC.0000000000002787) (doi)
- [PMC full text](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6445608/) (full text)

## Agent Guidance

Preserve the paper-level scope of this note. Do not generalize beyond the population, protocol, measured outcomes, and limitations above.