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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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THE INFLUENCE OF WEIGHT LOSS ON ANAEROBIC THRESHOLD IN OBESE WOMEN |
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Agnieszka Zak-Golab1  ,
Barbara Zahorska-Markiewicz2, Józef Langfort3, Michal
Holecki1,4, Piotr Kocelak5, Katarzyna Mizia-Stec6,
Magdalena Olszanecka-Glinianowicz5 and Jerzy Chudek1 |
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1Department and Unit of Pathophysiology, Medical University of Silesia, Katowice, Poland, 2Obesity Management Clinic "Waga", Katowice, Poland, 3Department of Physiology, Academy of Physical Education, Katowice, Poland and Laboratory of Experimental Pharmacology, Polish Academy of Science, Warsaw, Poland, 4Department of Internal Medicine and Metabolic Diseases, and 5Health Promotion and Obesity Management, and 6Department of Cardiology, Medical University of Silesia, Katowice, Poland |
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© Journal of Sports Science and Medicine (2010) 9, 564 - 571 |
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| ABSTRACT | |||
| Obesity is associated with decreased physical activity. The aim
of the study was to assess the anaerobic threshold in obese and normal weight
women and to analyse the effect of weight-reduction therapy on the determined
thresholds. Patients and methods: 42 obese women without concomitant disease
(age 30.5 ± 6.9y; BMI 33.6 ± 3.7 kg·m-2) and 19 healthy normal
weight women (age 27.6 ± 7.0y; BMI 21.2 ± 1.9 kg·m-2) performed
cycle ergometer incremental ramp exercise test up to exhaustion. The test
was repeated in 19 obese women after 12.3 ± 4.2% weight loss. The lactate
threshold (LT) and the ventilatory threshold (VT) were determined. Obese
women had higher lactate (expressed as oxygen consumption) and ventilator
threshold than normal weight women. The lactate threshold was higher than
ventilatory one both in obese and normal weight women (1.11 ± 0.21 vs 0.88
± 0.18 L·min-1, p < 0.001; 0.94 ± 0.15 vs 0.79 ± 0.23 L·min-
1, p < 0.01, respectively). After weight reduction therapy neither
the lactate nor the ventilatory threshold changed significantly. The results
concluded that; 1. The higher lactate threshold noted in obese women may
be related to the increased fat acid usage in metabolism. 2. Both in obese
and normal weight women lactate threshold appears at higher oxygen consumption
than ventilatory threshold. 3. The obtained weight reduction, without weight
normalisation was insufficient to cause significant changes of lactate and
ventilatory thresholds in obese women.
Key words: Obesity, anaerobic threshold, lactate threshold, ventilatory threshold. |
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