Accelerometry-measured physical activity and inflammation after gestational diabetes

Longitudinal associations of physical activity with inflammatory markers in US adults with and without type 1 diabetes

AIMS

To investigate the longitudinal associations of different levels of moderate-to-vigorous physical activity (MVPA) with C-reactive protein (CRP), plasminogen activator inhibitor-1 (PAI-1), and fibrinogen.

METHODS

We conducted longitudinal analyses with data from the Coronary Artery Calcification in T1D (CACTI) cohort, which included individuals with type 1 diabetes (T1D, n = 563) and without diabetes mellitus (non-DM, n = 692) with ∼ 3 years follow-up. Individuals were divided into groups to perform two analyses: 1) those who performed any MVPA and those who were sedentary (0 mins/week) and 2) those who performed 1-149 mins/week, ≥150 mins/week, or who were sedentary. Mixed effect models with an unstructured covariance structure were applied.

RESULTS

Compared to sedentary individuals, any MVPA was associated with a -2.96 % decrease in fibrinogen (p-value = 0.0043) and a -11.23 % decrease in PAI-1 (p-value = 0.0007) in combined analyses. Stratified analyses found 1-149 mins/week and ≥ 150 mins/week were associated with significant decreases in fibrinogen, -5.31 % and -3.44 %, respectively, in those with T1D. Both the non-DM and T1D groups had significant decreases in PAI-1 associated with ≥ 150 mins/week (-9.11 % and -16.96 %, respectively).

CONCLUSIONS

Our findings highlight that meeting ≥ 150 mins/week of MVPA is inversely associated with inflammatory markers linked with increased CVD risk.

Physical Activity during Pregnancy: Comparisons between Objective Measures and Self-Reports in Relation to Blood Glucose Levels

Objective: to quantify pregnant women’s physical activity during pregnancy using wearable accelerometers and a self-reported scale and to examine the variation in these two physical activity measures in relation to fasting plasma glucose (FPG) levels and presence of gestational diabetes mellitus (GDM). Methods: this prospective observational study included 197 pregnant women from one of the largest regional hospitals in South China. Women with singleton pregnancy, absence of pre-existing comorbidities and pre-specified contraindications, wore an accelerometer on their waist for 7 consecutive days to objectively record their physical activity, followed by completing a past-7-day physical activity questionnaire, three times, respectively, in three trimesters. GDM was determined by 2-h 75 g oral glucose tolerance test (OGTT) in 24–28th week’s gestation and FPG was obtained in both 1st and 2nd trimesters following standard practice. Results: pregnant women engaged highest levels of various physical activity types in 2nd trimester, except accelerometer-based moderate-to-vigorous physical activity which gradually decreased in pregnancy. Pregnant women were more likely to walk in 3rd trimester. The relationship between objective total physical activity and self-reported total physical activity was non-linear. Increased trend of FPG from 1st trimester to 2nd trimester disappeared when adjusting for accelerometer-based light physical activity and attenuated when including walking. Self-reported moderate physical activity was surprisingly positively associated with GDM. Conclusions: different patterns in physical activity between objective measure and self-report in relation to gestational glucose levels were observed. Short-term increase in moderate physical activity prior to OGTT may not be necessary for reducing presence of GDM. Future glucose management for pregnant women may be targeted at lower intensity physical activity.

Low physical activity levels 1 year after pregnancy complications

OBJECTIVES

Women with previous preeclampsia (PE), gestational hypertension (GH), or gestational diabetes mellitus (GDM) have increased cardiovascular disease (CVD) risk. Physical activity (PA) is an important CVD risk modifier. We aimed to assess PA levels, using a validated objective method, and other modifiable CVD risk factors in women with these previous pregnancy complications.

STUDY DESIGN

One year postpartum we assessed PA levels for 1 week in women with previous PE (n = 68), GH (n = 26), GDM (n = 23), and normotensive pregnancies (n = 65), using the ActiGraph-wGT3X-BT™ accelerometer.

OUTCOME MEASURES

We assessed adherence to American PA guidelines (≥150 min/week of moderate or ≥75 min/week of vigorous intensity PA), and time spent in moderate and vigorous PA. We also assessed steps/day, blood pressure and anthropometric indices.

RESULTS

Recommended PA levels were achieved in only 50%, 39%, and 35% following PE, GH, and GDM, respectively, not significantly different from controls (52%). Differences in moderate and vigorous PA levels and steps/day between the groups were non-significant, except from lower vigorous PA in women with previous GDM. Elevated blood pressure (systolic BP ≥ 120 mmHg and/or diastolic BP ≥ 80 mmHg) was more common after PE and GH. Overweight rates were significantly higher in PE, GH, and GDM groups compared to controls.

CONCLUSIONS

Less than half of women achieved recommended PA levels 1 year postpartum. This did not differ significantly between women with previous PE, GH, or GDM compared to controls. Measures to increase PA in postpartum women are warranted, especially in women with pregnancy complications associated with high risk of premature CVD.

Higher number of steps and breaks during sedentary behaviour are associated with better lipid profiles

BACKGROUND

Physical activity (PA) is known to be associated with lipid profiles and the risk of both cardiovascular diseases and cancer. The aim of this study was to evaluate the association of objectively measured PA, sedentary behaviour (SB), amount of breaks during SB and number of daily steps with serum lipids in a healthy, Finnish, middle-aged, female population.

METHODS

The participants (571) were recruited at mammography screening, target group was women aged 50-60 years. A measurement of PA was done with accelerometer, blood lipid profile was assessed, and questionnaires of participants characteristics were sent to participants.

RESULTS

The participants with the highest number of daily breaks during SB (≥ 41) had the highest mean concentration of HDL-cholesterol (high density lipoprotein cholesterol, HDL-c) (1.9 mmol/l, standard deviation (SD) 0.4) and the lowest mean concentration of triglycerides (1.0 mmol/l, SD 0.5). HDL-c level was 0.16 mmol/l higher (p < 0.001) in the group with 28-40.9 breaks/day and 0.25 mmol/l higher (p < 0.001) among participants with ≥41 breaks/day than in the group with the fewest breaks during SB (< 28). Those with the most daily steps (≥ 9100) had the highest mean HDL-c level (1.9 mmol/l). HDL-c level was 0.16 mmol/l higher (p < 0.001) among the participants with 5600-9099 steps/day and 0.26 mmol/l higher (p < 0.001) among participants with ≥9100 steps/day than those with the fewest steps (< 5600). The number of daily steps was inversely associated with the triglyceride concentration. From wake-time, participants spent 60% in SB, 18% standing, 14% in light PA, and 9% in moderate-to-vigorous PA (MVPA). PA was associated with serum total cholesterol (TC), HDL-c and triglyceride levels. The mean HDL-c level was the highest in the lowest quartile of SB and in the highest quartile of MVPA.

CONCLUSIONS

To our knowledge, this is the first study showing a high number of objectively measured breaks during SB is associated with a favourable effect on the level of serum lipids, which may later translate into cardiovascular health among middle-aged women.

TRIAL REGISTRATION

This study was registered and approved by the Regional Ethics Committee of Tampere University Hospital in Finland (approval code R15137 ).

Health Demands Moderate the Link Between Willpower Beliefs and Physical Activity in Patients with Knee Osteoarthritis

BACKGROUND

Regular physical activity (PA) was found to alleviate pain and improve functioning among patients with osteoarthritis of the knee (OAK). Heightened health demands due to OAK severity, body mass index (BMI), and depressive symptoms may require self-regulatory strategies to engage in more PA. Research on willpower-the capacity to exert self-control-suggests that believing that willpower is a nonlimited rather than a limited resource predicts effective self-regulation specifically when demands are high. The present study examines the association of OAK patients' willpower beliefs with their daily PA as a function of health demands.

METHODS

To identify the moderating role of OAK severity (WOMAC), BMI, and depressive symptoms (CES-D) on the link between willpower beliefs and objectively assessed PA over a 7-day period, baseline data of a registered randomized controlled trial with 243 patients (Mage = 65.47 years, SD = 0.49) were examined in secondary analyses.

RESULTS

Moderation analyses revealed that overall positive associations of willpower beliefs with PA were further qualified by OAK severity, BMI, and depressive symptoms. When patients faced less health demands, believing that willpower is nonlimited was associated with more PA. When health demands were higher, willpower beliefs were not associated with PA.

CONCLUSION

OAK patients' willpower beliefs were associated with PA. However, facing more health demands seemed to erase this beneficial link. Improving willpower beliefs by way of intervention may help to shed more light on predictive direction and ways to overcome barriers to regular physical activity.

Use of Mobile Devices to Measure Outcomes in Clinical Research, 2010-2016: A Systematic Literature Review

Background

The use of mobile devices in clinical research has advanced substantially in recent years due to the rapid pace of technology development. With an overall aim of informing the future use of mobile devices in interventional clinical research to measure primary outcomes, we conducted a systematic review of the use of and clinical outcomes measured by mobile devices (mobile outcomes) in observational and interventional clinical research.

Method

We conducted a PubMed search using a range of search terms to retrieve peer-reviewed articles on clinical research published between January 2010 and May 2016 in which mobile devices were used to measure study outcomes. We screened each publication for specific inclusion and exclusion criteria. We then identified and qualitatively summarized the use of mobile outcome assessments in clinical research, including the type and design of the study, therapeutic focus, type of mobile device(s) used, and specific mobile outcomes reported.

Results

The search retrieved 2,530 potential articles of interest. After screening, 88 publications remained. Twenty-five percent of the publications (n = 22) described mobile outcomes used in interventional research, and the rest (n = 66) described observational clinical research. Thirteen therapeutic areas were represented. Five categories of mobile devices were identified: (1) inertial sensors, (2) biosensors, (3) pressure sensors and walkways, (4) medication adherence monitors, and (5) location monitors; inertial sensors/accelerometers were most common (reported in 86% of the publications). Among the variety of mobile outcomes, various assessments of physical activity were most common (reported in 74% of the publications). Other mobile outcomes included assessments of sleep, mobility, and pill adherence, as well as biomarkers assessed using a mobile device, including cardiac measures, glucose, gastric reflux, respiratory measures, and intensity of head-related injury.

Conclusion

Mobile devices are being widely used in clinical research to assess outcomes, although their use in interventional research to assess therapeutic effectiveness is limited. For mobile devices to be used more frequently in pivotal interventional research – such as trials informing regulatory decision-making – more focus should be placed on: (1) consolidating the evidence supporting the clinical meaningfulness of specific mobile outcomes, and (2) standardizing the use of mobile devices in clinical research to measure specific mobile outcomes (e.g., data capture frequencies, placement of device). To that aim, this manuscript offers a broad overview of the various mobile outcome assessments currently used in observational and interventional research, and categorizes and consolidates this information for researchers interested in using mobile devices to assess outcomes in interventional research.

Which cytokine is the most related to weight loss-induced decrease in arterial stiffness in overweight and obese men?

Obesity and increased arterial stiffness are risk factors for cardiovascular disease. A well-known characteristic of obesity is the chronic low-grade inflammatory state, and it causes elevation of arterial stiffness. Weight-loss reduces arterial stiffness and inflammatory level in obese individuals. However, it is unclear which inflammatory factor is most related to weight loss-induce decreases in arterial stiffness in overweight and obese men. Thus, the aim of this study was to determine which circulating cytokine level has the most effect on decreasing arterial stiffness after lifestyle modification. Twenty overweight and obese men completed a 12-week period of lifestyle modifications (combination of aerobic exercise training and dietary modification). We measured brachial-ankle pulse wave velocity (baPWV) as an index of arterial stiffness, and circulating cytokine levels using comprehensive analysis. After the 12-week lifestyle modifications, body mass was markedly decreased. Also, baPWV and the levels of several circulating cytokines significantly decreased after the lifestyle modifications. We observed a positive correlation between changes in baPWV and circulating interleukin-6 (IL-6) levels. Furthermore, multiple liner regression analysis revealed that change in baPWV was significantly associated with that in IL-6 levels after consideration of changes in systolic blood pressure and body mass index. These results suggest that for overweight and obese men, a 12-week period of lifestyle modifications-induced a decrease in circulating cytokine levels (especially IL-6 levels), leads to decreased baPWV.

Inflammatory Markers in Older Women with a History of Gestational Diabetes and the Effects of Weight Loss

The purpose of this study was to compare systemic inflammation in older women with a history of gestational diabetes (GDM) who developed impaired glucose tolerance (IGT) or type 2 diabetes (T2DM) to that in those with normal glucose tolerance (NGT) and to determine, in these women, the effect of weight loss (WL) induced by diet and exercise training on systemic inflammation and adipokine levels. This was a longitudinal clinical investigation of overweight/obese (BMI: 32 ± 1 kg/m²) women (59 ± 1 years) with a GDM history (n = 19) who had normal glucose tolerance (NGT, n = 7) or IGT/T2DM (n = 12). Women completed 6 months of weight loss induced by diet and exercise and underwent VO₂max, body composition, blood draw, glucose tolerance testing, and 2-hour hyperinsulinemic-euglycemic clamps (40 mU·m^-2·min^-1). Glucose utilization (M) was 42% higher in the NGT group (P < 0.05). CRP was two-fold higher in the IGT/T2DM group than that in the NGT group (P < 0.01). Adiponectin levels were 59% higher in the NGT group than those in the IGT/T2DM group (P < 0.01). IL-6sR was higher in the NGT group (P < 0.01). The women lost body weight, body fat, visceral fat, and subcutaneous abdominal fat (P < 0.001). Fasting glucose (P < 0.05), fasting insulin, glucose, and insulin AUC decreased (all P < 0.005) after the intervention. M increased by 21% (P < 0.05). CRP (-16%) and TNFR1 (-6%) tended to decrease, whereas TNFα, IL-6, SAA, and adiponectin did not change in the group. In conclusion, older women with a history of GDM who have developed IGT or T2DM have higher CRP and reduced adiponectin levels despite similar BMI and total and abdominal obesity to those with NGT. Six months WL induced by diet and exercise improves body composition and increases insulin sensitivity without a significant modification of inflammatory markers and adiponectin levels.

Role of Plasminogen Activator Inhibitor Type 1 in Pathologies of Female Reproductive Diseases

Normal pregnancy is a state of hypercoagulability with diminishing fibrinolytic activity, which is mainly caused by an increase of plasminogen activator inhibitor type 1 (PAI-1). PAI-1 is the main inhibitor of plasminogen activators, including tissue-type plasminogen activator (tPA) and urokinase-type plasminogen activator (uPA). In human placentas, PAI-1 is expressed in extravillous interstitial trophoblasts and vascular trophoblasts. During implantation and placentation, PAI-1 is responsible for inhibiting extra cellular matrix (ECM) degradation, thereby causing an inhibition of trophoblasts invasion. In the present study, we have reviewed the literature of various reproductive diseases where PAI-1 plays a role. PAI-1 levels are increased in patients with recurrent pregnancy losses (RPL), preeclampsia, intrauterine growth restriction (IUGR), gestational diabetes mellitus (GDM) in the previous pregnancy, endometriosis and polycystic ovary syndrome (PCOS). In general, an increased expression of PAI-1 in the blood is associated with an increased risk for infertility and a worse pregnancy outcome. GDM and PCOS are related to the genetic role of the 4G/5G polymorphism of PAI-1. This review provides an overview of the current knowledge of the role of PAI-1 in reproductive diseases. PAI-1 represents a promising monitoring biomarker for reproductive diseases and may be a treatment target in the near future.

Sedentary behavior, gestational diabetes mellitus, and type 2 diabetes risk: where do we stand?

A substantial number of pregnancies are complicated by gestational diabetes mellitus (GDM) and up to 70 % of women with GDM go on to develop type 2 diabetes. Given the extensive body of research suggesting physical activity reduces the risk of type 2 diabetes, facilitating physical activity, and reducing sedentary time may be effective approaches to promote the health of women with a previous GDM diagnosis. Here, we discuss physical activity, exercise, and sedentary behavior, in the context of GDM and the potential for type 2 diabetes risk reduction.