What question did this study set out to answer?

To develop and validate prediction equations for VO2max and graded exercise test duration from 6-minute walk test performance in a diverse cohort.

February 17, 2026The Journals of Gerontology Series AOpen Access

Development and Validation of Cardiorespiratory Fitness Prediction Equations from 6-Minute Walk Test in the CARDIA Study

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Key result

Sex-specific CARDIA equations predict VO2max from 6MWT with less bias than Burr and FRIEND equations.

Why the study?

Assessing VO2max, the gold standard for assessing cardiorespiratory fitness, is often impractical in large-scale studies.

Can the 6-minute walk test accurately predict VO2max and graded exercise test duration using newly derived CARDIA equations in an aging population?

Key Points

To develop and validate prediction equations for VO2max and graded exercise test duration from 6-minute walk test performance in a diverse cohort.
Analyzed data from 564 CARDIA participants who completed the 6MWT and modified Balke treadmill GXT.
Divided samples into training (2/3) and testing (1/3) groups for equation derivation and evaluation.
Used stepwise linear regression to identify predictors for VO2max and GXT duration based on 6MWT distance.
Compared CARDIA equations with Burr and FRIEND equations for accuracy.
CARDIA equations explained 53% of variance in men and 57% in women for VO2max, showing strong correlations (r = 0.73 for men, r = 0.78 for women).
GXT duration equations explained 59% in men and 62% in women with strong correlations (r = 0.71 for men, r = 0.72 for women).
CARDIA equations demonstrated lower biases and stronger correlations compared to Burr and FRIEND equations.

Structured PICO

Can the 6-minute walk test accurately predict VO2max and graded exercise test duration using newly derived CARDIA equations in an aging population?

Population

564 Coronary Artery Risk Development in Young Adults (CARDIA) participants (mean age: 61.5 years; 58% women; 40% Black) who completed the 6-minute walk test (6MWT) and symptom-limited modified Balke treadmill graded exercise test (GXT) at the Year 35 (2021-22) follow-up exam.

Intervention

Sex-specific VO2max and graded exercise test duration (GXTd) prediction equations derived from 6-minute walk test (6MWT) performance (CARDIA equations).

Comparator

Burr and FRIEND prediction equations (for VO2max).

Outcome

Accuracy of predicted VO2max and GXTd compared to measured values (evaluated by variance explained, Pearson correlation coefficients, and Bland-Altman plots).surrogate

The newly derived CARDIA prediction equations accurately estimate VO2max and graded exercise test duration from the 6-minute walk test, providing a practical alternative to maximal exercise testing in aging populations.

Discussion

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Implication

May aid VO2max estimation via 6MWT in aging adults; leaves open need for prospective validation before clinical adoption.

Cite This Study

Hornikel et al. (2026) studied this question. Sex-specific CARDIA equations predicted VO2max from 6MWT with strong correlations (r=0.73 men, r=0.78 women) and less bias than Burr and FRIEND equations.

synapsesocial.com/papers/699405774e9c9e835dfd6592 https://doi.org/10.1093/gerona/glag040

View Full Paper

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Development and Validation of Cardiorespiratory Fitness Prediction Equations from 6-Minute Walk Test in the CARDIA Study

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Development and Validation of Cardiorespiratory Fitness Prediction Equations from 6-Minute Walk Test in the CARDIA Study

Key Points

Structured PICO

Discussion

Implication

Cite This Study

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