The Claim
Wearing a 5% body weight vest during running does not significantly alter fatty acid oxidation rates or total caloric expenditure in recreationally trained runners.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Running with a vest that weighs 5% of your body weight does not change how much fat your body burns or how many calories you use up compared to running without a vest.
See the scientific wording
A 5% body weight vest does not significantly alter fatty acid oxidation or caloric expenditure during running in recreationally trained runners, suggesting minimal metabolic impact at this load.
When a person runs with a light weight on their back, their muscles and lungs don't need to work harder because the extra load is too small to change how the body uses fuel or burns calories. The body keeps using the same mix of fat and sugar for energy and burns the same number of calories as if they were running without the weight.
What the research says
1 studyStudy: Predictors of Fat Oxidation and Caloric Expenditure With and Without Weighted Vest Running
Wearing a backpack that’s 5% of your body weight while running doesn’t make you burn more calories or use more fat than running without it—only heavier packs (10%) do. So for light loads, your body treats it like running normally.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.