The effects of a glucose load and sympathetic challenge on autonomic function in obese women with and without type 2 diabetes mellitus

Jill A. Kanaley, Tracy Baynard, Ruth M. Franklin, Ruth S. Weinstock, Styliani Goulopoulou, Robert Carhart, Robert Ploutz-Snyder, Arturo Figueroa, Bo Fernhall

Research output: Contribution to journalArticleResearchpeer-review

14 Citations (Scopus)

Abstract

This study examined the effect of glucose ingestion on cardiac autonomic function in nonobese women and obese women with and without type 2 diabetes mellitus. Heart rate variability was measured via continuous electrocardiogram, and beat-by-beat blood pressure was recorded using finger photoplethysmography (Portapres, TNO Biomedical Instrumentation, Amsterdam, The Netherlands) in a fasted state and in response to a 75-g glucose load in 42 middle-aged women (40-60 years). Upright tilt was also used as an orthostatic stress to provide a clinically relevant challenge to the cardiovascular system. Significant main effects for log-transformed (Ln) total power (TP, square milliseconds) were observed with upright tilt (P < .01) and glucose challenge (P < .05). LnTP decreased in all groups in both the fasted and fed state with upright tilt (P < .01), but glucose ingestion resulted in higher LnTP in the supine position only (P = .008). Tilt resulted in a significant main effect for low-frequency (LFnu, calculated in normalized units) and high-frequency (HFnu, calculated in normalized units) power (P < .000), whereas the glucose challenge had no effect on LFnu or HFnu power. LFnu approached significance for group differences (P = .07), such that the nonobese had lower LF power than either of the obese groups. Sympathovagal balance (LnLF/HF ratio) was affected by position (P < .000) and group (P < .05), with a lower LnLF/HF in the nonobese than in the obese women. Baroreceptor sensitivity decreased (P < .01) during upright tilt but was not changed by the glucose challenge. In conclusion, basal sympathovagal balance is higher in obese individuals with and without type 2 diabetes mellitus. Women with type 2 diabetes mellitus showed no differences in autonomic function with an orthostatic challenge or glucose load than nondiabetic, obese women. The glucose load did alter total spectral power in all of these middle-aged women but had no impact on baroreceptor sensitivity.

Original languageEnglish
Pages (from-to)778-785
Number of pages8
JournalMetabolism: Clinical and Experimental
Volume56
Issue number6
DOIs
StatePublished - 1 Jun 2007

Fingerprint

Type 2 Diabetes Mellitus
Glucose
Pressoreceptors
Eating
Photoplethysmography
Supine Position
Cardiovascular System
Netherlands
Fingers
Electrocardiography
Heart Rate
Blood Pressure

Cite this

Kanaley, Jill A. ; Baynard, Tracy ; Franklin, Ruth M. ; Weinstock, Ruth S. ; Goulopoulou, Styliani ; Carhart, Robert ; Ploutz-Snyder, Robert ; Figueroa, Arturo ; Fernhall, Bo. / The effects of a glucose load and sympathetic challenge on autonomic function in obese women with and without type 2 diabetes mellitus. In: Metabolism: Clinical and Experimental. 2007 ; Vol. 56, No. 6. pp. 778-785.
@article{502d2097d3c44df69d7a8dc5913d1dee,
title = "The effects of a glucose load and sympathetic challenge on autonomic function in obese women with and without type 2 diabetes mellitus",
abstract = "This study examined the effect of glucose ingestion on cardiac autonomic function in nonobese women and obese women with and without type 2 diabetes mellitus. Heart rate variability was measured via continuous electrocardiogram, and beat-by-beat blood pressure was recorded using finger photoplethysmography (Portapres, TNO Biomedical Instrumentation, Amsterdam, The Netherlands) in a fasted state and in response to a 75-g glucose load in 42 middle-aged women (40-60 years). Upright tilt was also used as an orthostatic stress to provide a clinically relevant challenge to the cardiovascular system. Significant main effects for log-transformed (Ln) total power (TP, square milliseconds) were observed with upright tilt (P < .01) and glucose challenge (P < .05). LnTP decreased in all groups in both the fasted and fed state with upright tilt (P < .01), but glucose ingestion resulted in higher LnTP in the supine position only (P = .008). Tilt resulted in a significant main effect for low-frequency (LFnu, calculated in normalized units) and high-frequency (HFnu, calculated in normalized units) power (P < .000), whereas the glucose challenge had no effect on LFnu or HFnu power. LFnu approached significance for group differences (P = .07), such that the nonobese had lower LF power than either of the obese groups. Sympathovagal balance (LnLF/HF ratio) was affected by position (P < .000) and group (P < .05), with a lower LnLF/HF in the nonobese than in the obese women. Baroreceptor sensitivity decreased (P < .01) during upright tilt but was not changed by the glucose challenge. In conclusion, basal sympathovagal balance is higher in obese individuals with and without type 2 diabetes mellitus. Women with type 2 diabetes mellitus showed no differences in autonomic function with an orthostatic challenge or glucose load than nondiabetic, obese women. The glucose load did alter total spectral power in all of these middle-aged women but had no impact on baroreceptor sensitivity.",
author = "Kanaley, {Jill A.} and Tracy Baynard and Franklin, {Ruth M.} and Weinstock, {Ruth S.} and Styliani Goulopoulou and Robert Carhart and Robert Ploutz-Snyder and Arturo Figueroa and Bo Fernhall",
year = "2007",
month = "6",
day = "1",
doi = "10.1016/j.metabol.2007.02.001",
language = "English",
volume = "56",
pages = "778--785",
journal = "Metabolism: Clinical and Experimental",
issn = "0026-0495",
publisher = "W.B. Saunders Ltd",
number = "6",

}

The effects of a glucose load and sympathetic challenge on autonomic function in obese women with and without type 2 diabetes mellitus. / Kanaley, Jill A.; Baynard, Tracy; Franklin, Ruth M.; Weinstock, Ruth S.; Goulopoulou, Styliani; Carhart, Robert; Ploutz-Snyder, Robert; Figueroa, Arturo; Fernhall, Bo.

In: Metabolism: Clinical and Experimental, Vol. 56, No. 6, 01.06.2007, p. 778-785.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - The effects of a glucose load and sympathetic challenge on autonomic function in obese women with and without type 2 diabetes mellitus

AU - Kanaley, Jill A.

AU - Baynard, Tracy

AU - Franklin, Ruth M.

AU - Weinstock, Ruth S.

AU - Goulopoulou, Styliani

AU - Carhart, Robert

AU - Ploutz-Snyder, Robert

AU - Figueroa, Arturo

AU - Fernhall, Bo

PY - 2007/6/1

Y1 - 2007/6/1

N2 - This study examined the effect of glucose ingestion on cardiac autonomic function in nonobese women and obese women with and without type 2 diabetes mellitus. Heart rate variability was measured via continuous electrocardiogram, and beat-by-beat blood pressure was recorded using finger photoplethysmography (Portapres, TNO Biomedical Instrumentation, Amsterdam, The Netherlands) in a fasted state and in response to a 75-g glucose load in 42 middle-aged women (40-60 years). Upright tilt was also used as an orthostatic stress to provide a clinically relevant challenge to the cardiovascular system. Significant main effects for log-transformed (Ln) total power (TP, square milliseconds) were observed with upright tilt (P < .01) and glucose challenge (P < .05). LnTP decreased in all groups in both the fasted and fed state with upright tilt (P < .01), but glucose ingestion resulted in higher LnTP in the supine position only (P = .008). Tilt resulted in a significant main effect for low-frequency (LFnu, calculated in normalized units) and high-frequency (HFnu, calculated in normalized units) power (P < .000), whereas the glucose challenge had no effect on LFnu or HFnu power. LFnu approached significance for group differences (P = .07), such that the nonobese had lower LF power than either of the obese groups. Sympathovagal balance (LnLF/HF ratio) was affected by position (P < .000) and group (P < .05), with a lower LnLF/HF in the nonobese than in the obese women. Baroreceptor sensitivity decreased (P < .01) during upright tilt but was not changed by the glucose challenge. In conclusion, basal sympathovagal balance is higher in obese individuals with and without type 2 diabetes mellitus. Women with type 2 diabetes mellitus showed no differences in autonomic function with an orthostatic challenge or glucose load than nondiabetic, obese women. The glucose load did alter total spectral power in all of these middle-aged women but had no impact on baroreceptor sensitivity.

AB - This study examined the effect of glucose ingestion on cardiac autonomic function in nonobese women and obese women with and without type 2 diabetes mellitus. Heart rate variability was measured via continuous electrocardiogram, and beat-by-beat blood pressure was recorded using finger photoplethysmography (Portapres, TNO Biomedical Instrumentation, Amsterdam, The Netherlands) in a fasted state and in response to a 75-g glucose load in 42 middle-aged women (40-60 years). Upright tilt was also used as an orthostatic stress to provide a clinically relevant challenge to the cardiovascular system. Significant main effects for log-transformed (Ln) total power (TP, square milliseconds) were observed with upright tilt (P < .01) and glucose challenge (P < .05). LnTP decreased in all groups in both the fasted and fed state with upright tilt (P < .01), but glucose ingestion resulted in higher LnTP in the supine position only (P = .008). Tilt resulted in a significant main effect for low-frequency (LFnu, calculated in normalized units) and high-frequency (HFnu, calculated in normalized units) power (P < .000), whereas the glucose challenge had no effect on LFnu or HFnu power. LFnu approached significance for group differences (P = .07), such that the nonobese had lower LF power than either of the obese groups. Sympathovagal balance (LnLF/HF ratio) was affected by position (P < .000) and group (P < .05), with a lower LnLF/HF in the nonobese than in the obese women. Baroreceptor sensitivity decreased (P < .01) during upright tilt but was not changed by the glucose challenge. In conclusion, basal sympathovagal balance is higher in obese individuals with and without type 2 diabetes mellitus. Women with type 2 diabetes mellitus showed no differences in autonomic function with an orthostatic challenge or glucose load than nondiabetic, obese women. The glucose load did alter total spectral power in all of these middle-aged women but had no impact on baroreceptor sensitivity.

UR - http://www.scopus.com/inward/record.url?scp=34248330938&partnerID=8YFLogxK

U2 - 10.1016/j.metabol.2007.02.001

DO - 10.1016/j.metabol.2007.02.001

M3 - Article

VL - 56

SP - 778

EP - 785

JO - Metabolism: Clinical and Experimental

JF - Metabolism: Clinical and Experimental

SN - 0026-0495

IS - 6

ER -