Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2005) 04, 534 - 542

Research article
Relationship Between the MTI Accelerometer (Actigraph) Counts and Running Speed During Continuous and Intermittent Exercise
Comlavi B. Guinhouya1,2, Hervé Hubert1, , Grégory Dupont2, Alain Durocher1
Author Information
1 Medical Decision Support, Institute of Engineering in Health of Lille, University of Lille 2, France
2 Laboratory of Human Movement Studies, Faculty of Sport Sciences and Physical Education,University of Lille 2, France

Hervé Hubert
✉ EA 3614, Modelling Complex Systems, Medical Decision Support , Institute of Engineering in Health of Lille, University of Lille 2, France
Email: herve.hubert@univ-lille2.fr
Publish Date
Received: 22-06-2005
Accepted: 10-10-2005
Published (online): 01-12-2005
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ABSTRACT

This study was designed to investigate the relationship between Actigraph counts and running speed; and to describe differences due to accelerometer position on the body and due to exercise modality. Eleven physical education students (age, 25.1 ± 3.7 years; height, 1.73 ± 0.10 m; body mass, 70.8 ± 10.8 kg) completed two exhaustive exercise tests (continuous and intermittent), with MTI accelerometers mounted both at the hip and ankle. Exercise consisted of running for 3-min at incremental speeds until volitional exhaustion. During both exercise tests, the relationship between the ActiGraph outputs worn at the hip and speed was linear in the range 1.1 - 3.3 m·s-1 (r2 = 0.94 and 0.95, p < 0.01 for continuous and intermittent exercise respectively). A coefficient of determination of r2 = 0.97 (p < 0.01) was found with ankle wearing from walking, jogging and running at high speeds. There was a body placement effect at all absolute speeds (p < 0.01); but no exercise effect on accelerometer counts and no interaction between placement and exercise (p> 0.05). The ActiGraph seems to be a reliable tool for estimating a wide range of activity or exercise intensities. An ActiGraph worn at the ankle may be more appropriate to reflect normal human movement.

Key words: Physical activity, joint kinematics, hip, ankle


           Key Points
  • Actigraph counts are not influenced by the type of activity.
  • The levelling off of Actigraph output depends mainly on its location on the body, and does not reflect a lack of sensivity at higher speeds.
  • The ActiGraph can be an alternative tool to estimate activity intensity in various conditions.
 
 
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