Gender-dependent effects of exercise training on serum leptin levels in humans

1997 ◽  
Vol 272 (4) ◽  
pp. E562-E566 ◽  
Author(s):  
M. S. Hickey ◽  
J. A. Houmard ◽  
R. V. Considine ◽  
G. L. Tyndall ◽  
J. B. Midgette ◽  
...  
Keyword(s):  
Insulin Sensitivity ◽  
Exercise Training ◽  
Aerobic Exercise ◽  
Fat Mass ◽  
Aerobic Capacity ◽  
Aerobic Exercise Training ◽  
Sensitivity Index ◽  
Insulin Sensitivity Index ◽  
Serum Leptin ◽  
Body Fat Content

Leptin, the product of the ob gene, is elevated in obese humans and appears to be closely related to body fat content. The purpose of the present investigation was to determine the effect of aerobic exercise training on systemic leptin levels in humans. Eighteen sedentary middle-aged men (n = 9) and women (n = 9) who did not differ in aerobic capacity (29.4 +/- 1.2 vs. 27.5 +/- 1.2 ml x kg(-1) x min(-1)) or insulin sensitivity index (3.41 +/- 1.12 vs. 4.88 +/- 0.55) were studied. Fat mass was significantly lower in females vs. males (21.83 +/- 2.25 vs. 26.99 +/- 2.37 kg, P < 0.05). Despite this, fasting serum leptin was significantly higher in the females vs. males (18.27 +/- 2.55 vs. 9.88 +/- 1.26 ng/ml, P < 0.05). Serum leptin concentration decreased 17.5% in females (P < 0.05) after 12 wk of aerobic exercise training (4 day/wk, 30-45 min/day) but was not significantly reduced in males. Fat mass was not altered after training in either group. In contrast, both aerobic capacity (+13% males, +9.1% females) and insulin sensitivity (+35% males, +82% females) were significantly improved subsequent to training. These data suggest that 1) women have higher circulating leptin concentrations despite lower fat mass and 2) exercise training appears to have a greater effect on systemic leptin levels in females than in males.

Sympathetic activity and the heterogenous blood pressure response to exercise training in hypertensives

2002 ◽  
Vol 92 (4) ◽  
pp. 1434-1442 ◽  
Author(s):  
Michael D. Brown ◽  
Donald R. Dengel ◽  
Robert V. Hogikyan ◽  
Mark A. Supiano
Keyword(s):  
Blood Pressure ◽  
Insulin Sensitivity ◽  
Exercise Training ◽  
Aerobic Exercise ◽  
Blood Pressure Response ◽  
Pressure Response ◽  
Aerobic Exercise Training ◽  
Sensitivity Index ◽  
Arterial Blood ◽  
Wide Range

To test whether changes in sympathetic nervous system (SNS) activity or insulin sensitivity contribute to the heterogeneous blood pressure response to aerobic exercise training, we used compartmental analysis of [3H]norepinephrine kinetics to determine the extravascular norepinephrine release rate (NE2) as an index of systemic SNS activity and determined the insulin sensitivity index (SI) by an intravenous glucose tolerance test, before and after 6 mo of aerobic exercise training, in 30 (63 ± 7 yr) hypertensive subjects. Maximal O2consumption increased from 18.4 ± 0.7 to 20.8 ± 0.7 ml · kg−1· min−1( P = 0.02). The average mean arterial blood pressure (MABP) did not change (114 ± 2 vs. 114 ± 2 mmHg); however, there was a wide range of responses (−19 to +17 mmHg). The average NE2did not change significantly (2.11 ± 0.15 vs. 1.99 ± 0.13 μg · min−1· m−2), but there was a significant positive linear relationship between the change in NE2and the change in MABP ( r = 0.38, P = 0.04). SIincreased from 2.81 ± 0.37 to 3.71 ± 0.42 μU × 10−4· min−1· ml−1( P = 0.004). The relationship between the change in SIand the change in MABP was not statistically significant ( r = −0.03, P = 0.89). When the changes in maximal O2consumption, percent body fat, NE2, and SIwere considered as predictors of the change in MABP, only NE2was a significant independent predictor. Thus suppression of SNS activity may play a role in the reduction in MABP and account for a portion of the heterogeneity of the MABP response to aerobic exercise training in older hypertensive subjects.

scholarly journals Aerobic exercise training conserves insulin sensitivity for 1 yr following weight loss in overweight women

2012 ◽  
Vol 112 (4) ◽  
pp. 688-693 ◽  
Author(s):  
Gordon Fisher ◽  
Gary R. Hunter ◽  
Barbara A. Gower
Keyword(s):  
Weight Loss ◽  
Insulin Sensitivity ◽  
Resistance Training ◽  
Exercise Training ◽  
Aerobic Exercise ◽  
Aerobic Exercise Training ◽  
Whole Body ◽  
Sensitivity Index ◽  
Group Time

The objectives of this study were to 1) identify the independent effects of exercise (aerobic or resistance training) and weight loss on whole body insulin sensitivity and 2) determine if aerobic or resistance training would be more successful for maintaining improved whole body insulin sensitivity 1 yr following weight loss. Subjects were 97 healthy, premenopausal women, body mass index (BMI) 27–30 kg/m2. Following randomized assignment to one of three groups, diet only, diet + aerobic, or diet + resistance training until a BMI <25 kg/m2 was achieved, body composition, fat distribution, and whole body insulin sensitivity were determined at baseline, in the weight reduced state, and at 1-yr follow up. The whole body insulin sensitivity index (SI) was determined using a frequently sampled intravenous glucose tolerance test. Results of repeated-measures ANOVA indicated a significant improvement in SI following weight loss. However, there were no group or group×time interactions. At 1-yr follow up, there were no significant time or group interactions for SI; however, there was a significant group×time interaction for SI. Post hoc analysis revealed that women in the aerobic training group showed a significant increased SI from weight reduced to 1-yr follow up ( P < 0.05), which was independent of intra-abdominal adipose tissue and %fat. No significant differences in SI from weight reduced to 1-yr follow up were observed for diet only or diet + resistance groups. Additionally, multiple linear regression analysis revealed that change in whole body insulin sensitivity from baseline to 1-yr follow up was independently associated with the change in V̇o2max from baseline to 1-yr follow up ( P < 0.05). These results suggest that long-term aerobic exercise training may conserve improvements in SI following weight loss and that maintaining cardiovascular fitness following weight loss may be important for maintaining improvements in SI.

scholarly journals Examining Bone, Muscle and Fat in Middle-Aged Long-Term Endurance Runners: A Cross-Sectional Study

2020 ◽  
Vol 9 (2) ◽  
pp. 522
Author(s):  
Ulrike H. Mitchell ◽  
Bruce Bailey ◽  
Patrick J. Owen
Keyword(s):  
Exercise Training ◽  
Aerobic Exercise ◽  
Fat Mass ◽  
Lean Mass ◽  
Aerobic Exercise Training ◽  
Middle Aged ◽  
Cross Sectional ◽  
Endurance Runners ◽  
Total Body

Aerobic exercise training has many known cardiovascular benefits that may promote healthy aging. It is not known if long-term aerobic exercise training is also associated with structural benefits (e.g., lower fat mass, higher areal bone mineral density (BMD) and greater muscle mass). We evaluated these parameters in middle-aged long-term endurance runners compared to sex-, age-, height-, and weight-matched non-running controls. Total and regional lean and fat mass and areal BMD were assessed by dual-energy X-ray absorptiometry. Sagittal magnetic resonance images captured the cross-sectional area and thickness of the lumbar multifidus. Runners (n = 10; all male) had a mean (standard deviation; SD) age of 49 (4) years, height of 178.9 (4.9) cm, weight of 67.8 (5.8) kg, body mass index (BMI) of 21.4 (1.4) kg/m2 and had been running 82.6 (27.9) km/week for 23 (13) years. Controls (n = 9) had a mean (SD) age of 51 (5) years, height of 176.0 (5.1) cm, weight of 72.8 (7.1) kg, and BMI of 23.7 (2.1) kg/m2. BMI was greater in controls (p = 0.010). When compared to controls on average, runners had a 10 percentage-point greater total body lean mass than controls (p = 0.001) and 14% greater trunk lean mass (p = 0.010), as well as less total body (8.6 kg; p < 0.001), arm (58%; p = 0.002), leg (52%; p < 0.001), trunk (73%; p < 0.001), android (91%; p < 0.001), and gynoid fat mass (64%; p < 0.001). No differences were observed between groups for BMD outcomes or multifidus size. These results underscore the benefits of endurance running to body composition that carry over to middle-age.

Abstract P137: Aerobic, Resistance or Combination Exercise Training does not Reduce C-Reactive Protein Levels in Individuals with Type 2 Diabetes

Circulation ◽  
2012 ◽  
Vol 125 (suppl_10) ◽  
Author(s):  
Damon L Swift ◽  
Neil M Johannsen ◽  
Conrad P Earnest ◽  
Steven N Blair ◽  
Timothy S Church
Keyword(s):  
Type 2 Diabetes ◽  
Exercise Training ◽  
Aerobic Exercise ◽  
Fat Mass ◽  
Fasting Glucose ◽  
Aerobic Exercise Training ◽  
C Reactive Protein ◽  
Protein Levels ◽  
Reactive Protein

Introduction: Type 2 diabetes is associated with elevated C-reactive protein levels (CRP), which is an independent risk factor for cardiovascular disease. Aerobic exercise training especially with weight/adiposity reduction has been shown to improve CRP, however few studies have evaluated the effect of other exercise training modalities (aerobic, resistance or combination training) on CRP in individuals with type 2 diabetes. Hypothesis: We hypothesize that combination training will improve CRP to a greater extent than other modalities of exercise training, and change in CRP levels will be associated with changes in weight and adiposity. Methods: The present study is a secondary analysis of the Health Benefits of Aerobic and Resistance Training in Individuals with Type 2 Diabetes (HART-D) study. Participants (n=204) were randomized to aerobic exercise (aerobic), resistance exercise (resistance) or a combination of both (combination) for nine months. Results: Baseline CRP was correlated with fat mass, waist circumference, BMI, and inversely correlated with VO2 peak (p<0.05). CRP was not reduced in the aerobic (0.16 mg•L-1, 95% CI: -1.0, 1.3), resistance (-0.03 mg•L-1, 95% CI: -1.1, 1.0) or combination (-0.49 mg•L-1, 95% CI: -1.5 to 0.6) groups compared to control (0.35 mg•L-1, 95% CI: -1.0, 1.7). Change in CRP was associated with change in fasting glucose (r=0.20, p= 0.009), glycated hemoglobin (HbA1C) (r=0.21 p=0.005), and fat mass (r=0.19, p=0.016), but not change in fitness or weight (p > 0.05). Conclusions: In conclusion, aerobic, resistance or a combination of both did not reduce CRP levels in individuals with type 2 diabetes. However, exercise related improvements in HbA1C, fasting glucose, and fat mass were associated with reductions in CRP.

scholarly journals Analysis of the relationship between fasting serum leptin levels and estimates of beta-cell function and insulin sensitivity in a population sample of 380 healthy young Caucasians

1999 ◽  
pp. 180-185 ◽  
Author(s):  
SM Echwald ◽  
JO Clausen ◽  
T Hansen ◽  
SA Urhammer ◽  
L Hansen ◽  
...  
Keyword(s):  
Insulin Sensitivity ◽  
Beta Cell Function ◽  
Cell Function ◽  
Serum Insulin ◽  
Population Based ◽  
Sensitivity Index ◽  
Insulin Sensitivity Index ◽  
Fasting Serum ◽  
Serum Leptin ◽  
The Relationship

OBJECTIVE: Circulating leptin levels correlate positively with the degree of obesity and prolonged hyperinsulinaemia increases serum leptin levels. Moreover, insulin secreting beta-cells express functional leptin receptors indicating a functional relationship between leptin and insulin. The aim of this study was to examine the relationship between fasting serum leptin levels and measures of insulin sensitivity and beta-cell function in a population-based sample of 380 young healthy Caucasians. DESIGN AND METHODS: Multiple regression analysis was employed to analyse the relationship between fasting serum leptin levels and levels of fasting serum insulin, insulin sensitivity index and acute insulin response (AIR) in a population-based study of 380 young healthy Caucasians who underwent a combined intravenous glucose and tolbutamide tolerance test. RESULTS AND CONCLUSION: Serum leptin levels were positively correlated to measures of adiposity and were 3.2 times higher in women than in men (P<0.00001). In multiple regression analyses adjusting for age, percentage body fat, waist circumference and maximal aerobic capacity, a significant positive correlation was observed between the fasting serum leptin concentrations and both fasting serum insulin levels (P<0.0001) and AIR (P = 0.014) for women. No significant interrelation of these variables was found in men. However, for both genders a significant negative correlation was observed between fasting serum leptin levels and measures of insulin sensitivity index (P = 0.007).

scholarly journals Aerobic Exercise Training Prevents Insulin Resistance and Hepatic Lipid Accumulation in LDL Receptor Knockout Mice Chronically Fed a Low-Sodium Diet

Nutrients ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 2174
Author(s):  
Guilherme da Silva Ferreira ◽  
Ana Paula Garcia Bochi ◽  
Paula Ramos Pinto ◽  
Vanessa Del Bianco ◽  
Letícia Gomes Rodrigues ◽  
...  
Keyword(s):  
Gene Expression ◽  
Insulin Resistance ◽  
Insulin Sensitivity ◽  
Exercise Training ◽  
Aerobic Exercise ◽  
Body Mass ◽  
Ldl Receptor ◽  
Oxidative Capacity ◽  
Aerobic Exercise Training ◽  
Low Sodium

Background: A low-sodium (LS) diet reduces blood pressure, contributing to the prevention of cardiovascular diseases. However, intense dietary sodium restriction impairs insulin sensitivity and worsens lipid profile. Considering the benefits of aerobic exercise training (AET), the effect of LS diet and AET in hepatic lipid content and gene expression was investigated in LDL receptor knockout (LDLr-KO) mice. Methods: Twelve-week-old male LDLr-KO mice fed a normal sodium (NS) or LS diet were kept sedentary (S) or trained (T) for 90 days. Body mass, plasma lipids, insulin tolerance testing, hepatic triglyceride (TG) content, gene expression, and citrate synthase (CS) activity were determined. Results were compared by 2-way ANOVA and Tukey’s post-test. Results: Compared to NS, LS increased body mass and plasma TG, and impaired insulin sensitivity, which was prevented by AET. The LS-S group, but not the LS-T group, presented greater hepatic TG than the NS-S group. The LS diet increased the expression of genes related to insulin resistance (ApocIII, G6pc, Pck1) and reduced those involved in oxidative capacity (Prkaa1, Prkaa2, Ppara, Lipe) and lipoprotein assembly (Mttp). Conclusion: AET prevented the LS-diet-induced TG accumulation in the liver by improving insulin sensitivity and the expression of insulin-regulated genes and oxidative capacity.

scholarly journals Relationship between V̇o2peak, cycle economy, and mitochondrial respiration in untrained/trained

2019 ◽  
Vol 127 (6) ◽  
pp. 1562-1568 ◽  
Author(s):  
Gary R. Hunter ◽  
Douglas R. Moellering ◽  
Samuel T. Windham ◽  
Shannon L. Mathis ◽  
Marcas M. Bamman ◽  
...  
Keyword(s):  
Exercise Training ◽  
Oxygen Uptake ◽  
Aerobic Exercise ◽  
Aerobic Capacity ◽  
Mitochondrial Respiration ◽  
Negative Relationship ◽  
Aerobic Exercise Training ◽  
Whole Body ◽  
Contributing Factors ◽  
Cycle Economy

Aerobic capacity is negatively related to locomotion economy. The purpose of this paper is to determine what effect aerobic exercise training has on the relationship between net cycling oxygen uptake (inverse of economy) and aerobic capacity [peak oxygen uptake (V̇o2peak)], as well as what role mitochondrial coupled and uncoupled respiration may play in whole body aerobic capacity and cycling economy. Cycling net oxygen uptake and V̇o2peak were evaluated on 31 premenopausal women before exercise training (baseline) and after 8–16 wk of aerobic training. Muscle tissue was collected from 15 subjects at baseline and post-training. Mitochondrial respiration assays were performed using high-resolution respirometry. Pre- ( r = 0.46, P < 0.01) and postexercise training ( r = 0.62, P < 0.01) V̇o2peak and cycling net oxygen uptake were related. In addition, uncoupled and coupled fat respiration were related both at baseline ( r = 0.62, P < 0.01) and post-training ( r = 0.89, P < 01). Post-training coupled ( r = 0.74, P < 0.01) and uncoupled carbohydrate respiration ( r = 0.52, P < 05) were related to cycle net oxygen uptake. In addition, correlations between V̇o2peak and cycle net oxygen uptake persist both at baseline and after training, even after adjusting for submaximal cycle respiratory quotient (an index of fat oxidation). These results suggest that the negative relationship between locomotion economy and aerobic capacity is increased following exercise training. In addition, it is proposed that at least one of the primary factors influencing this relationship has its foundation within the mitochondria. Strong relationships between coupled and uncoupled respiration appear to be contributing factors for this relationship. NEW & NOTEWORTHY The negative relationship between cycle economy and aerobic capacity is increased following exercise training. The strong relationship between coupled and uncoupled respiration, especially after training, appears to be contributing to this negative relationship between aerobic capacity and cycling economy, suggesting that mitochondrial economy is not increased following aerobic exercise training. These results are suggestive that training programs designed to improve locomotion economy should focus on changing biomechanics.

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