Pedometer Accuracy in Patients with Chronic Heart Failure

Abstract

This study assesses the accuracy of the Omron HJ-720ITC pedometer at low walking intensities in patients with chronic heart failure. Step accuracy was assessed by visual observation on the treadmill and during free walking at 40, 50, 60, 70, 80 m/min, as well as during self paced walking using the 6 min walk test. A total of ninety-seven patients with heart failure (mean age: 61±13, NYHA I, N=30; NYHA II, N=32; NYHA III, N=35) participated in the study. At predefined walking speeds, a statistically significant % error in pedometer accuracy was evident at 60 m/min (p=0.039), and% error increased markedly below this threshold. Highest% error in pedometer accuracy was seen at 40 m/min (mean bias (% error): 28.3±9.0%; 95% CI: 21.8–34.7;p<0.001). During self paced walking (6MWT) the absolute% error in pedometer readings was largest in patients with strongest functional limitations and 6 MWT distances <400 m (mean bias (% error): 10.7±13.6%; CI 5.6–15.4, p<0.001). The Omron HJ-720ITC pedometer is accurate for monitoring activity in individuals with normal walking behaviour, but seems unsuitable for chronically ill patients characterised by slow walking gaits.

Key words

activity monitoring - accelerometer - 6-minute walk test - step detection

References

• 1 Bassett Jr DR, Ainsworth BE, Leggett SR, Mathien CA, Main JA, Hunter DC, Duncan GE. Accuracy of five electronic pedometers for measuring distance walked.  Med Sci Sports Exerc. 1996;  28 1071-1077
• 2 Belardinelli R, Georgiou D, Cianci G, Purcaro A. Randomized, controlled trial of long-term moderate exercise training in chronic heart failure: effects on functional capacity, quality of life, and clinical outcome.  Circulation. 1999;  99 1173-1182
• 3 Bravata DM, Smith-Spangler C, Sundaram V, Gienger AL, Lin N, Lewis R, Stave CD, Olkin I, Sirard JR. Using pedometers to increase physical activity and improve health: a systematic review.  JAMA. 2007;  298 2296-2304
• 4 Crouter SE, Schneider PL, Bassett Jr DR. Spring-levered versus piezo-electric pedometer accuracy in overweight and obese adults.  Med Sci Sports Exerc. 2005;  37 1673-1679
• 5 Cyarto EV, Myers AM, Tudor-Locke C. Pedometer accuracy in nursing home and community-dwelling older adults.  Med Sci Sports Exerc. 2004;  36 205-209
• 6 Haeuber E, Shaughnessy M, Forrester LW, Coleman KL, Macko RF. Accelerometer monitoring of home- and community-based ambulatory activity after stroke.  Arch Phys Med Rehabil. 2004;  85 1997-2001
• 7 Harris TJ, Owen CG, Victor CR, Adams R, Cook DG. What factors are associated with physical activity in older people, assessed objectively by accelerometry?.  Br J Sports Med. 2008;  43 442-450
• 8 Harriss DJ, Atkinson G. Ethical Standards in Sport and Exercise Science Research.  Int J Sports Med. 2009;  30 701-702
• 9 Haskell WL, Lee IM, Pate RR, Powell KE, Blair SN, Franklin BA, Macera CA, Heath GW, Thompson PD, Bauman A. Physical activity and public health: updated recommendation for adults from the American College of Sports Medicine and the American Heart Association.  Med Sci Sports Exerc. 2007;  39 1423-1434
• 10 Hasson RE, Haller J, Pober DM, Staudenmayer J, Freedson PS. Validity of the Omron HJ-112 pedometer during treadmill walking.  Med Sci Sports Exerc. 2009;  41 805-809
• 11 Hendelman D, Miller K, Baggett C, Debold E, Freedson P. Validity of accelerometry for the assessment of moderate intensity physical activity in the field.  Med Sci Sports Exerc. 2000;  32 S442-S449
• 12 Holbrook EA, Barreira TV, Kang M. Validity and reliability of Omron pedometers for prescribed and self-paced walking.  Med Sci Sports Exerc. 2009;  41 670-674
• 13 Jehn M, Schmidt-Trucksaess A, Schuster T, Hanssen H, Weis M, Halle M, Koehler F. Accelerometer-based quantification of 6-minute walk test performance in patients with chronic heart failure: applicability in telemedicine.  J Card Fail. 2009;  15 334-340
• 14 Jehn M, Schmidt-Trucksass A, Schuster T, Weis M, Hanssen H, Halle M, Koehler F. Daily walking performance as an independent predictor of advanced heart failure: Prediction of exercise capacity in chronic heart failure.  Am Heart J. 2009;  157 292-298
• 15 Karabulut M, Crouter SE, Bassett Jr DR. Comparison of two waist-mounted and two ankle-mounted electronic pedometers.  Eur J Appl Physiol. 2005;  95 335-343
• 16 Kochersberger G, McConnell E, Kuchibhatla MN, Pieper C. The reliability, validity, and stability of a measure of physical activity in the elderly.  Arch Phys Med Rehabil. 1996;  77 793-795
• 17 Macko RF, Haeuber E, Shaughnessy M, Coleman KL, Boone DA, Smith GV, Silver KH. Microprocessor-based ambulatory activity monitoring in stroke patients.  Med Sci Sports Exerc. 2002;  34 394-399
• 18 Melanson EL, Knoll JR, Bell ML, Donahoo WT, Hill JO, Nysse LJ, Lanningham-Foster L, Peters JC, Levine JA. Commercially available pedometers: considerations for accurate step counting.  Prev Med. 2004;  39 361-368
• 19 Motl RW, McAuley E, Snook EM, Scott JA. Accuracy of two electronic pedometers for measuring steps taken under controlled conditions among ambulatory individuals with multiple sclerosis.  Mult Scler. 2005;  11 343-345
• 20 Shepherd EF, Toloza E, McClung CD, Schmalzried TP. Step activity monitor: increased accuracy in quantifying ambulatory activity.  J Orthop Res. 1999;  17 703-708
• 21 Swartz AM, Bassett Jr DR, Moore JB, Thompson DL, Strath SJ. Effects of body mass index on the accuracy of an electronic pedometer.  Int J Sports Med. 2003;  24 588-592
• 22 Walsh JT, Charlesworth A, Andrews R, Hawkins M, Cowley AJ. Relation of daily activity levels in patients with chronic heart failure to long-term prognosis.  Am J Cardiol. 1997;  79 1364-1369

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