title: Effects of a brisk walk on lipoprotein lipase activity and plasma triglyceride concentrations in the fasted and postprandial states.
abstract: This study aimed to determine whether changes in plasma heparin-releasable lipoprotein lipase (LPL) activity following a brisk walk were associated with decreases in fasting and/or postprandial triglyceride (TG) concentrations. Two groups of pre-menopausal women participated. In one group (fasting study group, n=10), TG concentrations and post-heparin plasma LPL activity were measured in the fasted state on two occasions: approximately 18 h after a 2-h treadmill walk at 50% maximal oxygen uptake (exercise trial); and after a day of no exercise (control trial). The other group (postprandial study group, n=9) undertook two oral fat tolerance tests (blood samples taken fasting and for 6 h after a high-fat meal), with plasma LPL activity measured 6 h after meal ingestion. Pre-conditions were the same as for the fasting study group (i.e. control and prior exercise). Prior exercise reduced fasting TG concentrations by 23 (7)% (fasting study group) [mean (SEM)] and by 18 (9)% (postprandial study group) (both P<0.05), and the postprandial TG response by 23 (6)% (postprandial study group) (P<0.01). Plasma LPL activity was not significantly increased by exercise in either the fasting or postprandial study groups. However, exercise-induced changes in both fasting and postprandial LPL activity were significantly correlated with the respective exercise-induced changes in fasting TG concentration and the postprandial TG response (r=-0.70 and -0.77 respectively, P<0.05 for both). These data suggest that increased LPL activity may contribute to the hypotriglyceridaemic effect of moderate exercise, although other mechanisms are also likely to be involved.
authors.affiliation: Department of Pathological Biochemistry, Glasgow Royal Infirmary, 4th Floor, Queen Elizabeth Building, Glasgow, UK. j.gill@clinmed.gla.ac.uk
authors.forename: Jason M R
authors.initials: JM
authors.lastname: Gill
authors.forename: Sara L
authors.initials: SL
authors.lastname: Herd
authors.forename: Vandana
authors.initials: V
authors.lastname: Vora
authors.forename: Adrianne E
authors.initials: AE
authors.lastname: Hardman
mesh_terms: D000328:Adult; D004734:Energy Metabolism; D005215:Fasting / Q000378:metabolism*; D005260:Female; D006493:Heparin / Q000494:pharmacology; D006801:Humans; D008071:Lipoprotein Lipase / Q000378:metabolism*; D009994:Osmolar Concentration; D010101:Oxygen Consumption; D019518:Postprandial Period / Q000502:physiology*; D013997:Time Factors; D014280:Triglycerides / Q000097:blood*; D016138:Walking / Q000502:physiology*
chemical_list: D014280:Triglycerides; D006493:Heparin; D008071:Lipoprotein Lipase