title: Postexercise macronutrient intake and subsequent postprandial triglyceride metabolism.
abstract: Acute endurance exercise has been shown to lower postprandial plasma triglyceride (PPTG) concentrations; however, whether this is due to the negative energy and/or CHO deficit from the exercise bout is not well understood.
  
  
  OBJECTIVE
  This study aimed to examine the effects of a postexercise meal consisting of either high or low CHO content on PPTG and postprandial fat oxidation the morning after an exercise bout.
  
  
  METHODS
  Healthy young men (n = 6) performed each of four experimental treatments: 1) nonexercise control (CON), 2) 80 min of cycling with either no meal replacement (EX), 3) a high-CHO postexercise meal (EX+HCHO), or a 4) low-CHO postexercise meal (EX+LCHO). A standardized meal for PPTG determination was provided (16.0 kcal · kg(-1) body mass, 1.02 g fa t · kg(-1), 1.36 g CHO · kg(-1), 0.31 g protein · kg(-1)) 12 h after the exercise, and measurements of plasma triglyceride (TG) concentration and whole-body resting fat oxidation were made in the fasted condition and during the 4-h postprandial period.
  
  
  RESULTS
  The total area under the curve for plasma TG was significantly lower in EX+LCHO (325 (63) mg · dL(-1) per 4 h) compared with that in EX+HCHO (449 (118) mg · dL(-1) per 4 h, P = 0.03). Postprandial fat oxidation during this period was significantly greater in EX+LCHO (257 (58) kcal per 4 h, P = 0.003) compared with that in EX+HCHO (209 (56) kcal per 4 h). The change in total postprandial fat oxidation (kcal per 4 h) relative to CON was significantly and inversely correlated with the change in the total TG area under the curve relative to CON (mg · dL(-1) per 4 h, ΔTG AUC, R2 = 0.37, P = 0.008).
  
  
  CONCLUSIONS
  The low CHO composition of the postexercise meal contributes to lower PPTG and increased fat oxidation, with lower PPTG related to an increase in fat oxidation.
authors.affiliation: Human Performance Laboratory, Department of Kinesiology and Health Education, University of Texas at Austin, Austin, TX.
authors.forename: Justin R
authors.initials: JR
authors.lastname: Trombold
authors.forename: Kevin M
authors.initials: KM
authors.lastname: Christmas
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Machin
authors.forename: Douglas W
authors.initials: DW
authors.lastname: Van Pelt
authors.forename: Ting-Heng
authors.initials: TH
authors.lastname: Chou
authors.forename: Il-Young
authors.initials: IY
authors.lastname: Kim
authors.forename: Edward F
authors.initials: EF
authors.lastname: Coyle
mesh_terms: D000328:Adult; D019540:Area Under Curve; D001786:Blood Glucose / Q000378:metabolism; D004040:Dietary Carbohydrates / Q000008:administration & dosage*; D004041:Dietary Fats / Q000008:administration & dosage* / Q000378:metabolism; D004734:Energy Metabolism; D015444:Exercise / Q000502:physiology*; D005230:Fatty Acids, Nonesterified / Q000097:blood; D006801:Humans; D007328:Insulin / Q000097:blood; D008297:Male; D010084:Oxidation-Reduction; D010101:Oxygen Consumption; D010807:Physical Endurance / Q000502:physiology; D019518:Postprandial Period; D014280:Triglycerides / Q000097:blood*; D055815:Young Adult
chemical_list: D001786:Blood Glucose; D004040:Dietary Carbohydrates; D004041:Dietary Fats; D005230:Fatty Acids, Nonesterified; D007328:Insulin; D014280:Triglycerides