title: Tele-accelerometry as a novel technique for assessing functional status in patients with heart failure: feasibility, reliability and patient safety.
abstract: BACKGROUND
  The six-minute walk test (6MWT) is an established measure of functional exercise capacity associated with clinical prognosis in Chronic Heart Failure (CHF). The aim of this study is to evaluate the employment of tele-accelerometry for the remote assessment of 6MWT in CHF.
  
  
  METHODS
  155 patients were subjected to tele-accelerometry in form of monthly 6MWTs in their home surroundings. Accelerometer output included steps/6 min and walking speed. Data was directly transferred via mobile network to the Telemedicine Centre subsequent to test completion. 6MWT distance was measured by hand wheel and steps were counted with a digital hand-counter at baseline (Test 1) and at 12 months follow-up (Test 2).
  
  
  RESULTS
  Accelerometer accuracy was within the 99th percentile. There was a significant correlation between step count, walking speed and measured 6MWT distance (Test 1: steps: r=0.80, P<0.001; Test 2: steps: r=0.90, P<0.001 and Walking Speed Test 1: r=0.80, P<0.001; Walking Speed Test 2: r=0.86, P<0.001). The reproducibility of tele-accelerometry was within 95% margin for all performance parameters, which showed stronger associations to quality of life questionnaire (Short Form - 36) Physical Component Score (PCS) than New York Heart Association (NYHA) functional class.
  
  
  CONCLUSIONS
  Tele-accelerometry is feasible in patients with CHF and output parameters are indicative of exercise capacity. The benefit of this approach lies in its simplicity under every day circumstances by enabling routine performance testing to assess patients' functional status.
authors: Division of Pneumological Oncology and Transplantology; Charité - Universitätsmedizin Berlin, Campus Mitte, Berlin, Germany. Electronic address: melissa.jehn@charite.de.
authors: Melissa
authors: M
authors: Jehn
authors: Sandra
authors: S
authors: Prescher
authors: Kerstin
authors: K
authors: Koehler
authors: Stephan
authors: S
authors: von Haehling
authors: Sebastian
authors: S
authors: Winkler
authors: Oliver
authors: O
authors: Deckwart
authors: Marcus
authors: M
authors: Honold
authors: Udo
authors: U
authors: Sechtem
authors: Gert
authors: G
authors: Baumann
authors: Martin
authors: M
authors: Halle
authors: Stefan D
authors: SD
authors: Anker
authors: Friedrich
authors: F
authors: Koehler
mesh_terms: D000368:Aged; D004867:Equipment Design; D005080:Exercise Test / Q000295:instrumentation; D017079:Exercise Tolerance / Q000502:physiology*; D005240:Feasibility Studies; D005260:Female; D006333:Heart Failure / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D017216:Telemedicine / Q000379:methods*; D013686:Telemetry / Q000295:instrumentation*; D016138:Walking / Q000502:physiology*
keywords: 6-Minute walk test; Activity monitoring; Exercise testing; Systolic heart failure; TIM-HF trial; Telemedicine