Treadmill gait speeds correlate with physical activity counts measured by cell phone accelerometers

Richard H. Carlson, Derek R. Huebner, Carrie A. Hoarty, Jackie Whittington, Gleb Haynatzki, Michele C. Balas, Ana Katrin Schenk, Evan H. Goulding, Jane F. Potter, Stephen J. Bonasera*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


A number of important health-related outcomes are directly related to a person's ability to maintain normal gait speed. We hypothesize that cellular telephones may be repurposed to measure this important behavior in a noninvasive, continuous, precise, and inexpensive manner. The purpose of this study was to determine if physical activity (PA) counts collected by cell phone accelerometers could measure treadmill gait speeds. We also assessed how cell phone placement influenced treadmill gait speed measures. Participants included 55 young, middle-aged, and older community-dwelling men and women. We placed cell phones as a pendant around the neck, and on the left and right wrist, hip, and ankle. Subjects then completed an individualized treadmill protocol, alternating 1. min rest periods with 5. min of walking at different speeds (0.3-11.3. km/h; 0.2-7. mi/h). No persons were asked to walk at speeds faster than what they would achieve during day-to-day life. PA counts were calculated from all sensor locations. We built linear mixed statistical models of PA counts predicted by treadmill speeds ranging from 0.8 to 6.4. km/h (0.5-4. mi/h) while accounting for subject age, weight, and gender. We solved linear regression equations for treadmill gait speed, expressed as a function of PA counts, age, weight, and gender. At all locations, cell phone PA counts were strongly associated with treadmill gait speed. Cell phones worn at the hip yielded the best predictive model. We conclude that in both men and women, cell phone derived activity counts strongly correlate with treadmill gait speed over a wide range of subject ages and weights.

Original languageEnglish (US)
Pages (from-to)241-248
Number of pages8
JournalGait and Posture
Issue number2
StatePublished - Jun 2012


  • Actimetry
  • Cellular phone
  • Gait speed
  • Spatio-temporal organization of human behavior
  • Treadmill locomotion
  • Validation, actimetry

ASJC Scopus subject areas

  • Biophysics
  • Rehabilitation
  • Orthopedics and Sports Medicine


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