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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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NET HEART RATE TO PRESCRIBE PHYSICAL ACTIVITY IN MIDDLE-AGED TO OLDER ACTIVE ADULTS |
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José A. Bragada1,2  ,
Pedro P. Magalhães1, Catarina S. Vasques1,2, Tiago
M. Barbosa1,2 and Vítor P. Lopes1,2 |
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1Polytechnic Institute of Bragança, Department of Sport Sciences, Bragança, Portugal, 2Research Centre in Sports, Health and Human Development, Vila Real, Portugal. |
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© Journal of Sports Science and Medicine (2009) 8, 616 - 621 |
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| ABSTRACT | |||
| This study had a twofold purpose: i) to develop a regression equation
to estimate metabolic equivalent (MET) in walk/run by heart rate increment
above rest (NetHR), and; ii) to determine NetHR thresholds for light, moderate,
and vigorous physical activity (PA), from middle aged to elderly. Sample
1 (prediction sample) comprised 39 subjects (19 male and 20 female), with
58.2 ± 11.0 years old. Sample 2 (validation sample) comprised 40 subjects
(18 male and 22 female) with 63.3 ± 7.0 years old. Each participant did
the following activities in sequence, a 15min rest period in supine position,
walk at 3km/h, walk at 4.5km/h, and walk at 6km/h, for 6 min at each walk
velocity interval. The oxygen up-take (VO2)
and heart rate (HR) were continuously and simultaneously assessed. A hierarchical
linear model was used to analyze the relationship between metabolic equivalent
(MET) and NetHR. The regression equation for MET prediction was: MET = 1.265780
+ 0.109479 NetHR. The NetHR thresholds (upper limit) for light, moderate
and vigorous PA were 16 and 35 and 70 bpm, respectively. NetHR is a practical,
valid and non-invasive method to prescribe physical activity, taking in
account individual characteristics (HR at rest combined with NetHR) in middle-aged
to older adults.
Key words: Net heart rate, physical activity thresholds, MET, exercise prescription, oxygen up-take. |
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