The upper limit of the cardiorespiratory training zone (40–84%HRR) is overestimated for postmenopausal women

Abstract Objective : The purpose of this study was to examine the heart rate reserve (HRR) at first and second ventilatory thresholds (VT's) in postmenopausal women and compare it with optimal intensity range recommended by the ACSM (40–84%HRR). An additional aim was to evaluate whether a highe...

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Bibliographic Details
Published in:Journal of science and medicine in sport 2013-11, Vol.16 (6), p.571-576
Main Authors: Aragão, Florbela, Moreira, Maria Helena, Gabriel, Ronaldo Eugénio, Abrantes, Catarina Gavião
Format: Article
Language:English
Subjects:
Aged
Anaerobic Threshold
Cardiorespiratory fitness
Exercise
Exercise - physiology
Exercise intensity
Female
Healthy Volunteers
Heart Rate
Heart rate reserve
Humans
Menopause
Middle Aged
Physical fitness
Physical Medicine and Rehabilitation
Postmenopausal
Postmenopause - physiology
Prospective Studies
Sports Medicine
Ventilatory threshold
Womens health
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Summary:Abstract Objective : The purpose of this study was to examine the heart rate reserve (HRR) at first and second ventilatory thresholds (VT's) in postmenopausal women and compare it with optimal intensity range recommended by the ACSM (40–84%HRR). An additional aim was to evaluate whether a higher aerobic power level corresponded to a higher HRR at VT's. Methods : Fifty-eight postmenopausal women participated in this study (aged 48–69). A graded 25 W min−2 cycle ergometer (Monark E839) exercise protocol was performed in order to assess aerobic power. The heart rate and gas-exchange variables were measured continuously using a portable gas analyzer system (Cosmed K4b). The first (VT1 ) and the second (VT2 ) VT's were determined by the time course curves of ventilation and O2 and CO2 ventilatory equivalents. A K-means clustering analysis was used in order to identify VO2max groups (cut-off of 30.5 ml kg−1 min−1 ) and differences were evaluated by an independent sample t -test. Bland–Altman plots were performed to illustrate the agreement between methods. Results : The women's HRR values at VT1 were similar to 40%HRR in both VO2max groups. At VT2 both VO2max groups exhibited negative differences ( P < 0.01) for the predicted 84%HRR intensity (−14.46% in the lower VO2max group and −16.32% in the higher VO2max group). Conclusions : An upper limit of 84% overestimates the %HRR value for the second ventilatory threshold, suggesting that the cardiorespiratory target zone for this population should be lower and narrower (40–70%HRR).
ISSN:1440-2440
1878-1861
DOI:10.1016/j.jsams.2012.12.008