Effect of obesity and regional adiposity on the QTc interval in women

J. J. Park, Pamela Swan

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Objectives: To determine whether differences in body fat composition and body fat distribution patterns are associated with a prolongation of the corrected QT interval for heart rate (QTc) on the electrocardiogram (EKG) during rest and exercise. Design: Cross-sectional evaluation of the QTc interval in three groups of premenopausal women during rest and two exercise conditions (50% VO2 max and VO2 max). Subjects: Thirty-one healthy women with a mean age of 35 y (27-44 y) were classified as either obese (n = 22; percent body fat [%BF] > 30%) or nonobese (NO; n = 9; %BF ≤ 27%) by hydrostatic weighing. Obese subjects matched for age and %BF were grouped by waist to hip ratio (WHR) into two groups: upper body obesity (UBO; n = 11; WHR ≤ 0.85) and lower body obesity (LBO; n = 11; WHR ≤ 0.75). Measurements: RR and QT intervals were measured in a double-blind design with the aid of calipers and magnifying lens for seven consecutive beats in lead II from a 12-lead EKG at a paper speed of 25 mm/sec. Five consecutive cardiac cycles excluding the longest and shortest RR and QT intervals were averaged and calculated for QTc interval using Bazett's formula. RESULTS: Mean QTc intervals were significantly different (P < 0.001) across the groups for each condition. For all conditions, UBO had the longest QTc interval as compared to LBO and NO respectively (i.e., Rest: 0.426; 0.413; 0.399 sec(1/2) Mid 50%: 0.447; 0.426; 0.409 sec(1/2) Max: 0.390; 0.374; 0.357 sec(1/2)). Conclusions: The QTc interval is positively associated with UBO even at the same level of body fat in moderately obese women. It is clear that abdominal obesity may be one of the risk factors for a prolonged QTc interval in premenopausal women.

Original languageEnglish (US)
Pages (from-to)1104-1110
Number of pages7
JournalInternational Journal of Obesity
Volume21
Issue number12
StatePublished - 1997

Fingerprint

Adiposity
adiposity
waist-to-hip ratio
Waist-Hip Ratio
electrocardiography
obesity
Obesity
body fat
Adipose Tissue
Electrocardiography
exercise
Exercise
Body Fat Distribution
body fat distribution
calipers
Abdominal Obesity
Body Composition
Lens
Lenses
heart rate

Keywords

  • Body fat distribution
  • Electrocardiogram
  • Exercise
  • Waist-hip ratio

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Public Health, Environmental and Occupational Health
  • Endocrinology
  • Food Science
  • Endocrinology, Diabetes and Metabolism

Cite this

Effect of obesity and regional adiposity on the QTc interval in women. / Park, J. J.; Swan, Pamela.

In: International Journal of Obesity, Vol. 21, No. 12, 1997, p. 1104-1110.

Research output: Contribution to journalArticle

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abstract = "Objectives: To determine whether differences in body fat composition and body fat distribution patterns are associated with a prolongation of the corrected QT interval for heart rate (QTc) on the electrocardiogram (EKG) during rest and exercise. Design: Cross-sectional evaluation of the QTc interval in three groups of premenopausal women during rest and two exercise conditions (50{\%} VO2 max and VO2 max). Subjects: Thirty-one healthy women with a mean age of 35 y (27-44 y) were classified as either obese (n = 22; percent body fat [{\%}BF] > 30{\%}) or nonobese (NO; n = 9; {\%}BF ≤ 27{\%}) by hydrostatic weighing. Obese subjects matched for age and {\%}BF were grouped by waist to hip ratio (WHR) into two groups: upper body obesity (UBO; n = 11; WHR ≤ 0.85) and lower body obesity (LBO; n = 11; WHR ≤ 0.75). Measurements: RR and QT intervals were measured in a double-blind design with the aid of calipers and magnifying lens for seven consecutive beats in lead II from a 12-lead EKG at a paper speed of 25 mm/sec. Five consecutive cardiac cycles excluding the longest and shortest RR and QT intervals were averaged and calculated for QTc interval using Bazett's formula. RESULTS: Mean QTc intervals were significantly different (P < 0.001) across the groups for each condition. For all conditions, UBO had the longest QTc interval as compared to LBO and NO respectively (i.e., Rest: 0.426; 0.413; 0.399 sec(1/2) Mid 50{\%}: 0.447; 0.426; 0.409 sec(1/2) Max: 0.390; 0.374; 0.357 sec(1/2)). Conclusions: The QTc interval is positively associated with UBO even at the same level of body fat in moderately obese women. It is clear that abdominal obesity may be one of the risk factors for a prolonged QTc interval in premenopausal women.",
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AB - Objectives: To determine whether differences in body fat composition and body fat distribution patterns are associated with a prolongation of the corrected QT interval for heart rate (QTc) on the electrocardiogram (EKG) during rest and exercise. Design: Cross-sectional evaluation of the QTc interval in three groups of premenopausal women during rest and two exercise conditions (50% VO2 max and VO2 max). Subjects: Thirty-one healthy women with a mean age of 35 y (27-44 y) were classified as either obese (n = 22; percent body fat [%BF] > 30%) or nonobese (NO; n = 9; %BF ≤ 27%) by hydrostatic weighing. Obese subjects matched for age and %BF were grouped by waist to hip ratio (WHR) into two groups: upper body obesity (UBO; n = 11; WHR ≤ 0.85) and lower body obesity (LBO; n = 11; WHR ≤ 0.75). Measurements: RR and QT intervals were measured in a double-blind design with the aid of calipers and magnifying lens for seven consecutive beats in lead II from a 12-lead EKG at a paper speed of 25 mm/sec. Five consecutive cardiac cycles excluding the longest and shortest RR and QT intervals were averaged and calculated for QTc interval using Bazett's formula. RESULTS: Mean QTc intervals were significantly different (P < 0.001) across the groups for each condition. For all conditions, UBO had the longest QTc interval as compared to LBO and NO respectively (i.e., Rest: 0.426; 0.413; 0.399 sec(1/2) Mid 50%: 0.447; 0.426; 0.409 sec(1/2) Max: 0.390; 0.374; 0.357 sec(1/2)). Conclusions: The QTc interval is positively associated with UBO even at the same level of body fat in moderately obese women. It is clear that abdominal obesity may be one of the risk factors for a prolonged QTc interval in premenopausal women.

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