Effects of acute salbutamol intake during supramaximal exercise in women.
OBJECTIVE
To study the effects of an acute therapeutic oral intake of beta(2) agonist on performance and substrate response during supramaximal exercise in women.


METHODS
12 healthy moderately trained female volunteers performed a Wingate test after ingestion of placebo (Pla) and salbutamol (Sal; 4 mg) according to a double-blind randomised crossover study. Blood samples were collected at rest, at the end of exercise and after 5 (r5), 10 (r10) and 15 (r15) min of passive recovery for adrenocorticotropic hormone (ACTH), growth hormone (GH), insulin, blood glucose and lactate measurements.


RESULTS
Peak power (PP) and mean power (MP) significantly increased whereas time to peak power was significantly shorter with Sal than with Pla (p<0.05). No change was observed in the fatigue index. ACTH was not significantly modified but r15 growth hormone significantly decreased (p<0.05) after the intake of Sal. Both blood INS and blood glucose were significantly increased by the intake of Sal during all the experiments (p<0.01). Blood lactate was significantly increased by the intake of Sal compared with that of Pla (p<0.05) after 10 and 15 min of passive recovery.


CONCLUSIONS
From these data, acute therapeutic oral intake of Sal seems to induce, irrespective of the subjects' gender, an improvement in performance during a supramaximal exercise--that is, increase in PP and MP. Further studies are necessary to clarify whether the mechanisms involved in the response to intake of Sal are linked to central and/or peripheral pathways.
Le Panse
Bénédicte
B
LAPSEP, Orléans, France.
Arlettaz
Alexandre
A
Portier
Hugues
H
Lecoq
Anne-Marie
AM
De Ceaurriz
Jacques
J
Collomp
Katia
K
D000318:Adrenergic beta-Agonists / Q000494:pharmacology*; D000324:Adrenocorticotropic Hormone / Q000187:drug effects; D000328:Adult; D000420:Albuterol / Q000494:pharmacology*; D000704:Analysis of Variance; D001786:Blood Glucose / Q000187:drug effects; D018592:Cross-Over Studies; D004311:Double-Blind Method; D015444:Exercise / Q000502:physiology*; D005260:Female; D013006:Growth Hormone / Q000187:drug effects; D006801:Humans; D007328:Insulin / Q000097:blood; D019344:Lactic Acid / Q000097:blood
D000318:Adrenergic beta-Agonists; D001786:Blood Glucose; D007328:Insulin; D019344:Lactic Acid; D000324:Adrenocorticotropic Hormone; D013006:Growth Hormone; D000420:Albuterol