Effects of a tryptic hydrolysate from bovine milk alphaS1-casein on hemodynamic responses in healthy human volunteers facing successive mental and physical stress situations.
BACKGROUND
Preclinical results in rats have demonstrated anxiolytic-like effects of a tryptic bovine alphaS1-casein hydrolysate.


OBJECTIVE
We investigated the putative effects of this tryptic hydrolysate on systolic (SBP), diastolic (DBP) blood pressures, heart rate (HR) values and plasma cortisol concentrations (CC) in human healthy volunteers facing successive stress situations.


METHODS
The subjects were (double blind) randomly allocated to ingest three times, 12 hours apart, two capsules containing either 200 mg of alphaS1-casein hydrolysate (TS) or bovine skimmed milk powder as a placebo (CS). On the morning of the test day, a first blood sample for baseline measurement of CC was taken before the subjects were submitted to the Stroop test (ST) and, after a 30-min rest, to a Cold Pressor test (CPT). SBP, DBP, and HR were continuously recorded for 5 min before the ST and during each stress situation. A second blood sample was taken 15 min after the end of the CPT condition.


RESULTS
ST and ST + CPT combined test situations increased SBP, DBP and HR. The significant "Treatment x SBP" and "Treatment x DBP" interactions indicated the lower percentage changes in SBP and DBP of the TS. In addition, the results showed a significant decrease of the CC in the TS but not in the CS throughout the ST + CPT combined stress tests. HR remained stable in TS between the initial rest period and the CPT unlike what happened in CS.


CONCLUSIONS
On the basis of blood pressure and cortisol changes, these results suggest an antistress profile of this alphaS1-casein hydrolysate in human subjects.
Messaoudi
Michaël
M
ETAP-Applied Ethology 13, rue du Bois de la Champelle, 54500, Vandoeuvre-lès-Nancy, France. etap@etap-lab.com
Lefranc-Millot
Catherine
C
Desor
Didier
D
Demagny
Benoît
B
Bourdon
Lionel
L
D000704:Analysis of Variance; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects* / Q000502:physiology; D002364:Caseins / Q000008:administration & dosage* / Q000494:pharmacology; D004311:Double-Blind Method; D006339:Heart Rate / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D006854:Hydrocortisone / Q000097:blood*; D008297:Male; D008892:Milk / Q000737:chemistry; D013312:Stress, Physiological / Q000503:physiopathology*
D002364:Caseins; C475729:casein hydrolysate; D006854:Hydrocortisone