# Personalized metabolomics for predicting glucose tolerance changes in sedentary women after high-intensity interval training

PMID: 25164777
Journal: Scientific Reports
Published: 2014
Authors: Kuehnbaum NL, Gillen JB, Gibala MJ, Britz-McKibbin P

## Question

Can metabolomic profiles predict individual glucose-tolerance changes after six weeks of HIIT in sedentary overweight/obese women?

## Summary

In 11 sedentary overweight or obese women, six weeks of supervised cycling HIIT improved VO2max and maximal workload, but glucose-tolerance responses varied, including unfavorable responses in some participants.

## Population

- Overweight/obese healthy sedentary women.
- Sample size: 11
- Age: 18-45 years
- Sex: Female
- Fitness level: Sedentary
- Health status: Healthy after excluding metabolic/cardiovascular disease

## Methodology

- Single-group pre-post metabolomics intervention
- 6 weeks
- Supervised stationary cycle ergometer training with laboratory OGTT testing

## Protocol

- 10 x 1 min cycling HIIT.
- Modality: Stationary cycle.
- Work intervals: 60 s at workload eliciting 90% HRmax.
- Recovery: 60 s light cycling at 50 W.
- Sets or repetitions: 10.
- Intensity: 90% maximal heart rate.
- Session duration: 25 min.
- Frequency: 3 sessions/week.
- Program length: 6 weeks.
- Progression: Individualized workload adjustment.

## Outcomes

### Fitness
Status: improved
VO2max and maximal workload improved.

VO2max p=1.04E-3; Wmax p=2.35E-3.

### Glucose
Status: mixed
Group glucose improvement was not significant with all participants; responders varied.

tAUC p=0.0267 only after excluding one outlier.

### Prediction
Status: improved
Baseline and response metabolite ratios classified or predicted training glucose changes in this small sample.

TML/GlyCys-Cys-SS AUC=0.868, p=0.00581; MLR R2 about 0.99.

## Practical Insights

- Fitness outcomes and glucose outcomes can diverge.
- Personalized tracking matters for metabolic claims.

## Limitations

- Small sample
- No non-exercise control
- Women only
- Menstrual phase not controlled
- Free-living diet except standardized training-day breakfast
- Limited metabolomics coverage

## Safety And Adherence

- No clinical adverse events were reported.
- The paper reported unfavorable metabolic response signals: 54% positive responders, 27% non-responders, and 18% negative responders for 2 h plasma glucose; one participant worsened fasting and 2 h glucose.
- Sessions were supervised and participants with prediabetes, diabetes, hypertension, or cardiovascular disease were excluded.

## Original Sources

- [PubMed](https://pubmed.ncbi.nlm.nih.gov/25164777/) (pubmed)
- [DOI](https://doi.org/10.1038/srep06169) (doi)
- [PMC full text](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4147371/) (full text)

## Agent Guidance

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