title: Glucose effectiveness and insulin sensitivity measurements derived from the non-insulin-assisted minimal model and the clamp techniques are concordant.
abstract: BACKGROUND
  We investigated the concordance between glucose effectiveness (SG) and insulin sensitivity (SI), derived from the unmodified dynamic non-insulin-assisted intravenous glucose tolerance test (IVGTT) implemented by SG(MM) and SI(MM); simulation analysis and modelling/conversational interaction (SAAM/CONSAM) versus the eu/hyperglycaemic basal insulinaemic and the euglycaemic hyperinsulinaemic clamp (SG(CLAMP) and SI(CLAMP)).
  
  
  METHODS
  Twenty-seven of 30 normoglycaemic subjects completed a (1) euglycaemic hyperinsulinaemic clamp, (2) 6-h eu/hyperglycaemic near-normoinsulinaemic pancreatic clamp with hyperglycaemia present over the final 2 h of the clamp (Day 2 study), (3) identical clamp to (2) but with euglycaemia maintained over the entire 6 h (Day 3 study) and (4) IVGTT. SG(CLAMP) was calculated in two ways based on data from study (2) alone (Day 2 SG(CLAMP210-240')) or from data from study day (2) and (3) (Day 2-3 SG(CLAMP330-360')).
  
  
  RESULTS
  SG(MM) was unrelated to the magnitude of endogenous insulin release (AIR). The single-day (Day 2) and two-day (Day 2 and 3) SG(CLAMP) protocols correlated (r = 0.72, p = 0.003), but SG(CLAMP210-240') was significantly (p = 0.001) higher than SG(CLAMP330-360'). Employing the Day 2 and 3 SG(CLAMP) protocol, the whole body SG(CLAMP330-360') was similar to SG(MM) (1.80 ± 0.82 versus 1.73 ± 0.58 dL/min) and correlated (r = 0.45, p < 0.02). SG(CLAMP210-240') did not correlate with SG(MM) (r = 0.24). SI(MM) and SI(CLAMP) were similar (0.093 ± 0.060 versus 0.087 ± 0.029 dL/min per mU/L) and correlated (r = 0.76, p < 0.001).
  
  
  CONCLUSIONS
  The time-dependent increase in glucose disposal observed during a prolonged 6-h clamp significantly influences the estimation of SG(CLAMP), and significant concordance coefficients are observed between SG(MM), and SG(CLAMP330-360'), and SI(MM) and SI(CLAMP).
authors.affiliation: Department of Endocrinology M, Diabetes Research Centre, Odense University Hospital, Odense C, Denmark. jan.erik.henriksen@ouh.regionsyddanmark.dk
authors.forename: Jan Erik
authors.initials: JE
authors.lastname: Henriksen
authors.forename: Frank
authors.initials: F
authors.lastname: Alford
authors.forename: Glenn
authors.initials: G
authors.lastname: Ward
authors.forename: Peter
authors.initials: P
authors.lastname: Thye-Rønn
authors.forename: Klaus
authors.initials: K
authors.lastname: Levin
authors.forename: Ole
authors.initials: O
authors.lastname: Hother-Nielsen
authors.forename: Christian
authors.initials: C
authors.lastname: Rantzau
authors.forename: Ray
authors.initials: R
authors.lastname: Boston
authors.forename: Henning
authors.initials: H
authors.lastname: Beck-Nielsen
mesh_terms: D000328:Adult; D001786:Blood Glucose / Q000032:analysis*; D003924:Diabetes Mellitus, Type 2 / Q000188:drug therapy* / Q000378:metabolism; D005260:Female; D005947:Glucose / Q000008:administration & dosage*; D015309:Glucose Clamp Technique; D005951:Glucose Tolerance Test; D006801:Humans; D007328:Insulin / Q000008:administration & dosage* / Q000097:blood; D007333:Insulin Resistance; D008297:Male; D055815:Young Adult
chemical_list: D001786:Blood Glucose; D007328:Insulin; D005947:Glucose