title: Comparison of capillary and venous blood lactate and glucose values during cycle ergometry.
abstract: BACKGROUND
  The present study compared blood lactate and glucose values obtained from capillary and venous samples, and examined the utility of a modified capillary tube (55 mm in length) for a YSI 2300 Stat analyzer.
  
  
  METHODS
  Sixteen subjects (17-26 yrs) completed a graded exercise test using a cycle ergometer. Blood samples were collected during the last minute of each three minute stage from an indwelling venous catheter and via finger puncture. All samples were analyzed for glucose and lactate using the YSI 2300 Stat analyzer (Yellow Springs Instruments, Yellow Springs, OH).
  
  
  RESULTS
  Post hoc analysis indicated that venous blood lactate values were significantly lower than capillary values at 150 (p = 0.03) and 200 (p = 0.002) Watts. No differences were measured between the venous and capillary blood glucose values.
  
  
  CONCLUSIONS
  Attempts should be made to quantify potential capillary and venous differences in blood lactate resulting from various experimental protocols and environments.
authors.affiliation: James Madison University, Department of Kinesiology, Harrisonburg, VA 22807, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Flohr
authors.forename: C J
authors.initials: CJ
authors.lastname: Womack
authors.forename: P C
authors.initials: PC
authors.lastname: Kovalcik
mesh_terms: D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001774:Blood Chemical Analysis / Q000295:instrumentation; D001786:Blood Glucose / Q000032:analysis*; D002196:Capillaries; D002406:Catheterization, Peripheral; D002408:Catheters, Indwelling; D004734:Energy Metabolism; D004867:Equipment Design; D005080:Exercise Test; D005260:Female; D005385:Fingers / Q000098:blood supply; D006225:Hand / Q000098:blood supply; D006339:Heart Rate; D006801:Humans; D007773:Lactates / Q000097:blood*; D008297:Male; D005082:Physical Exertion / Q000502:physiology*; D011677:Punctures; D014680:Veins
chemical_list: D001786:Blood Glucose; D007773:Lactates