Study note • PMID 33691280
Effect of Foot Orthoses on Running Economy and Foot Longitudinal Arch Motion in Runners With Flat-Arched Feet.
Low risk + high feasibility for most athletes.
ELI5
In plain language
To determine the effect of manipulating foot longitudinal arch motion with different-stiffness foot orthoses on running economy (RE) in runners with flat-arched feet and if changes in arch deformation… (randomized trial; recreational runners).
The abstract suggests a trade-off or negative effect affecting Running economy. Treat this as a signal, not a guarantee; confirm methods and context in the full paper.
Takeaways
What the abstract suggests
- • Study question: To determine the effect of manipulating foot longitudinal arch motion with different-stiffness foot orthoses on running economy (RE) in runners with flat-arched feet and if changes in arch deformation…
- • The abstract suggests a trade-off or negative effect affecting Running economy.
- • Population: recreational runners.
- • Protocol cues (title/abstract): 12 km.
Protocol
Protocol (as reported)
- • Intervention/exposure: foot, orthoses (vs comparison group).
- • Dose/time/duration cues in abstract/title: 12 km.
- • Outcomes: Running economy.
- • Replication note: abstracts often omit adherence and timing; confirm details before changing training or supplementation.
Fit
Who it helps, and who should skip it
Who it helps
- • Athletes similar to the study population (recreational runners) working on biomechanics.
- • Athletes who can measure Running economy with a repeatable workout or time-trial effort.
Who should skip
- • If you have symptoms or conditions that make the intervention risky, get professional guidance.
- • If you’re near race day and can’t safely test, defer the experiment.
Methods
What the study actually did
- • Design: randomized trial.
- • Population: recreational runners.
- • Comparator: comparison group.
- • Outcomes measured: Running economy.
- • Protocol cues mentioned: 12 km.
- • Source: PubMed PMID 33691280 (2021) — International journal of sports physiology and performance.
Results excerpt
What the abstract reports
“Compared with standard orthoses, the mean VO2submax was significantly lower in both the flexible orthoses (-0.8 mL.kg-1.min-1, P < .001, d = 0.35) and footwear-only conditions (-1.2 mL.kg-1.min-1, P < .001, d = 0.49).”
Note: excerpts are short; for full context, read the paper.
Limits
Limitations & bias
- • Abstract-only summaries can miss critical details (population, protocol, adherence, and context).
- • Single studies often don’t generalize to your event, history, and training load; treat results as a starting point.
- • If your context differs (elite vs recreational; cycling vs running), adjust expectations and be conservative.
- • This is performance information, not medical advice.
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