# Using Inertial and Physiological Sensors to Investigate the Effects of a High-Intensity Interval Training and Plyometric Program on the Performance of Young Judokas

PMID: 36433355
Journal: Sensors (Basel, Switzerland)
Published: 2022 Nov 12
Authors: Mañas-Paris A, Muyor JM, Oliva-Lozano JM

## Question

Can inertial and physiological sensors detect performance changes after a short plyometric plus HIIT program in young judokas?

## Summary

In young judokas, adding two weekly 60-minute plyometric plus HIIT sessions for 3 weeks to usual judo training improved Special Judo Fitness Test score and some throwing-speed sensor measures. The study was small, nonrandomized, athlete-specific, and did not clearly describe the added HIIT/plyometric exercise content.

## Population

- Thirty-two young judokas born 2007-2011 who knew the Ippon-Seoi-Nage throw.
- Sample size: 32
- Age: 12.84 +/- 1.69 years
- Sex: 14 female, 18 male overall; each group 7 female and 9 male
- Fitness level: Youth judo athletes with 5.44 +/- 1.87 years of judo practice
- Health status: Excluded musculoskeletal injury within the prior 3 months

## Methodology

- Non-randomized controlled intervention
- 3 weeks
- Youth judo training environment with inertial and heart-rate sensor testing
- Controlled study design.

## Protocol

- Plyometric plus HIIT add-on.
- Modality: Judo-related plyometric and HIIT training.
- Intensity: High-intensity interval training, exact intensity not reported.
- Session duration: 60 min.
- Frequency: 2 added sessions/week plus regular judo training.
- Program length: 3 weeks.
- Progression: Not clearly reported.
- Regular judo training.
- Modality: Judo practice.
- Sets or repetitions: 3 sessions/week.
- Intensity: Standard judo training intensity not reported.
- Session duration: 90 min.
- Frequency: 3 sessions/week.
- Program length: 3 weeks.
- Progression: Usual training.

## Outcomes

### SJFT index
Status: improved
The experimental group improved SJFT index; control did not.

Experimental 22.27 +/- 2.73 to 19.65 +/- 1.70, table p=0.00, d=0.61; control 20.66 to 20.27, p=0.53

### X-axis speed
Status: improved
X-axis angular velocity increased in the experimental group.

320.87 +/- 51.15 to 356.50 +/- 40.47 deg/s; reported significant with d=0.45

### Y-axis speed
Status: improved
Y-axis angular velocity increased in the experimental group.

259.40 +/- 41.99 to 288.02 +/- 65.12 deg/s; p=0.02, d=0.31

### Round effect
Status: mixed
Round number affected X-axis angular speed in the experimental group.

Round effect F=10.81, p<=0.001, partial eta squared=0.68

## Practical Insights

- A short add-on block may improve sport-specific conditioning in youth judokas.
- Wearable inertial sensors can detect technique-speed changes during combat-sport tests.
- The intervention is not directly reusable because the HIIT/plyometric content is not sufficiently specified.

## Limitations

- Small nonrandomized sample.
- Only young judokas; growth and maturation may influence results.
- Intervention details beyond frequency and duration were unclear.
- Only 3 weeks of training.
- Sensor placement and fixation were noted as practical issues.

## Safety And Adherence

- Adverse events were not reported.
- Participants with musculoskeletal injury in the prior 3 months were excluded.

## Original Sources

- [PubMed](https://pubmed.ncbi.nlm.nih.gov/36433355/) (pubmed)
- [DOI](https://doi.org/10.3390/s22228759) (doi)
- [PMC full text](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9694478/) (full text)

## Agent Guidance

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