3 ms·

Does anyone know how they measure the energy used while running?

• stefan_ 2y ago
  You breathe into a mask and oxygen uptake / co2 exhaust is measured. This is of course contaminated by things like your individual efficiency but for relative measurements it’s fine.
• llimllib 2y ago
  My understanding is that they hook a runner up to a machine that measures their oxygen consumption, have them run a given pace in a given shoe, and measure how much oxygen they consume as a proxy to how much energy they’re using. With the super shoes, they use less oxygen to run at a given pace Example abstract: https://pubmed.ncbi.nlm.nih.gov/30374945/ https://pubmed.ncbi.nlm.nih.gov/30374945/
• 082349872349872 2y ago
  the article linked to from TFA, https://link.springer.com/article/10.1007/s40279-017-0811-2?app=true https://link.springer.com/article/10.1007/s40279-017-0811-2?... (2017), says: > We measured submaximal oxygen uptake and carbon dioxide production during minutes 3–5 and averaged energetic cost (W/kg) for the two trials in each shoe model. normally respiration gives very good results, better than other proxies such as accelerometry or heart rate measurement, but TIL that there's an even better method: doubly labeled water (DLW) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5426207/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5426207/ (2017) > ...after the subject ingests a dose of ²H2¹⁸O, there is an equilibration of the 2 isotopes with total body water (TBW) followed by their elimination from the body, which occurs at different rates. Deuterium (²H) is lost from the body via only water (H2O) while ¹⁸O is lost both via water and carbon dioxide (CO2). The rate of CO2 production (rCO2) is calculated as the difference between the elimination rates of ²H and ¹⁸O... the advantage is not needing to be masked during activity; the disadvantage is dealing with isotopes