Breaking Up Prolonged Sitting Alters the Postprandial Plasma Lipidomic Profile of Adults With Type 2 Diabetes.
Postprandial dysmetabolism in type 2 diabetes (T2D) is exacerbated by prolonged sitting and may trigger inflammation and oxidative stress. It is unknown what impact countermeasures to prolonged sitting have on the postprandial lipidome.



In this study, we investigated the effects of regular interruptions to sitting, compared with prolonged sitting, on the postprandial plasma lipidome.



Randomized crossover experimental trial.



Participants underwent three 7-hour conditions: uninterrupted sitting (SIT); light-intensity walking interruptions (LW); and simple resistance activity interruptions (SRA).



Baseline (fasting) and 7-hour (postprandial) plasma samples from 21 inactive overweight/obese adults with T2D were analyzed for 338 lipid species using mass spectrometry.



Using mixed model analysis (controlling for baseline outcome variable, gender, body mass index, and condition order), the percentage change in lipid species (baseline to 7 hours) was compared between conditions with Benjamini-Hochberg correction.



Thirty-seven lipids were different between conditions (P < 0.05). Compared with SIT, postprandial elevations in diacylglycerols, triacylglycerols, and phosphatidylethanolamines were attenuated in LW and SRA. Plasmalogens and lysoalkylphosphatidylcholines were reduced in SIT, compared with attenuated reductions or elevations in LW and SRA. Phosphatidylserines were elevated with LW, compared with reductions in SIT and SRA.



Compared with SIT, LW and SRA were associated with reductions in lipids associated with inflammation; increased concentrations of lipids associated with antioxidant capacity; and differential changes in species associated with platelet activation. Acutely interrupting prolonged sitting time may impart beneficial effects on the postprandial plasma lipidome of adults with T2D. Evidence on longer-term intervention is needed.
Baker Heart and Diabetes Institute, Melbourne, Victoria 3004, Australia.|Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Victoria 3800, Australia.
Megan S
MS
Grace
Baker Heart and Diabetes Institute, Melbourne, Victoria 3004, Australia.|Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Victoria 3800, Australia.|Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
Paddy C
PC
Dempsey
Baker Heart and Diabetes Institute, Melbourne, Victoria 3004, Australia.
Parneet
P
Sethi
Baker Heart and Diabetes Institute, Melbourne, Victoria 3004, Australia.
Piyushkumar A
PA
Mundra
Baker Heart and Diabetes Institute, Melbourne, Victoria 3004, Australia.
Natalie A
NA
Mellett
Baker Heart and Diabetes Institute, Melbourne, Victoria 3004, Australia.
Jacquelyn M
JM
Weir
Baker Heart and Diabetes Institute, Melbourne, Victoria 3004, Australia.|Swinburne University of Technology, Melbourne, Victoria 3122, Australia.
Neville
N
Owen
Baker Heart and Diabetes Institute, Melbourne, Victoria 3004, Australia.|Centre of Physical Activity and Nutrition Research, School of Exercise and Nutrition Sciences, Deakin University, Burwood, Victoria 3125, Australia.|Mary MacKillop Institute for Health Research, Australian Catholic University, Melbourne, Victoria 3000, Australia.
David W
DW
Dunstan
Baker Heart and Diabetes Institute, Melbourne, Victoria 3004, Australia.|Department of Biochemistry and Molecular Biology, University of Melbourne, Victoria 3010, Australia.
Peter J
PJ
Meikle
Baker Heart and Diabetes Institute, Melbourne, Victoria 3004, Australia.|Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, Victoria 3800, Australia.
Bronwyn A
BA
Kingwell
D000368:Aged; D018592:Cross-Over Studies; D003924:Diabetes Mellitus, Type 2 / Q000378:metabolism*; D004075:Diglycerides / Q000378:metabolism; D015444:Exercise; D005260:Female; D006801:Humans; D007249:Inflammation; D016014:Linear Models; D050356:Lipid Metabolism; D008297:Male; D013058:Mass Spectrometry; D008875:Middle Aged; D009765:Obesity / Q000378:metabolism*; D050177:Overweight / Q000378:metabolism; D018384:Oxidative Stress; D010713:Phosphatidylcholines / Q000378:metabolism; D010714:Phosphatidylethanolamines / Q000378:metabolism; D010718:Phosphatidylserines / Q000378:metabolism; D010955:Plasmalogens / Q000378:metabolism; D019518:Postprandial Period; D011187:Posture; D057185:Sedentary Behavior; D014280:Triglycerides / Q000378:metabolism
D004075:Diglycerides; D010713:Phosphatidylcholines; D010714:Phosphatidylethanolamines; D010718:Phosphatidylserines; D010955:Plasmalogens; D014280:Triglycerides