There are multiple definitions:

1. respiratory effort(English)

   • SAH, SDB
   • Pulmonology

2. reverse engineering(English)

   • AD, AL, DNN, DP, ML, TTE
   • Computing (biomedical), Machine learning
   • https://doi.org…OC.2020.2970615

3. refractive error(English)

   • is easily diagnosed and treated by an optometrist
   • VI
   • Ophthalmology
   • https://doi.org…ijo.IJO_1036_17

4. resistance exercise(English)

   • BFR, EIH, HLRE, LLRE, PPT, COX, DAMP, LLE, MAPK, NF-kB, TLR, TRIF
   • Exercise & Training, Aging, Woman /female, Immunology
   • https://doi.org…siol.00768.2019
   • https://doi.org…siol.00444.2023

5. running economy(English)

   • using a forefoot strike pattern towards the end of a long run may not be mechanically or metabolically beneficial for well-trained male rearfoot strike runners
   • FFS, RFS
   • Musculoskeletal system, Sports medicine, Metabolism
   • https://doi.org…14.2016.1266016

6. removal efficiency(English)

   • refers to emerging organic contaminants
   • BPA, EOC, DWS, GAC
   • Environment, Toxicology, Pollution and health, Hormone
   • https://doi.org…env.2011.01.010

7. role emotional(English)

   • refers to limitations due to emotional problems. One of eight health domains in SF-12v2
   • MCS, PCS, SDA, SF-12, SMI, WIN, HRQoL, SF-12v2, BEM, BP, DRD, GH, HFS, PF, PHLOC, PSI-SF, RP, SF, VT
   • Quality of life, Emotional aspects
   • https://doi.org…2955-018-0858-2

8. reflux esophagitis(English)

   • EoE, PPI, REE
   • Mouth, esophagus and stomach, Infection
   • https://doi.org…0535-016-1213-1

9. repeated exposure(English)

   • refers to complementary feeding to a vegetable puree in children
   • FFL, FNL, TE
   • Guidelines, Nutrition
   • https://doi.org…5/jn.113.175646

10. regional endocardial(English)

    • refers to border editing
    • HCM, HM, LVEDV, LVESV, LVEF, LAESVi, 3DQA, DCM
    • Cardiology, Medical imaging
    • https://doi.org…cc.v10.i13.4050

11. reactions to an emotional[ly difficult sport scenario](English)

    • CC, RESE, SC, SP
    • Emotional aspects, Sports medicine, Psychology
    • https://doi.org…ort.2023.102428