Open AccessEffect of antecedent moderate‐intensity exercise on the glycemia‐increasing effect of a 30‐sec maximal sprint: a sex comparison
Author(s) -
Justice Tara D.,
Hammer Greta L.,
Davey Raymond J.,
Paramalingam Nirubasini,
Guelfi Kym J.,
Lewis Lynley,
Davis Elizabeth A.,
Jones Timothy W.,
Fournier Paul A.
Publication year - 2015
Publication title -
physiological reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 39
ISSN - 2051-817X
DOI - 10.14814/phy2.12386
Subject(s) - sprint , medicine , endocrinology , intensity (physics) , epinephrine , physical therapy , physics , quantum mechanics
This study investigated whether a prior bout of moderate‐intensity exercise attenuates the glycemia‐increasing effect of a maximal 30‐sec sprint. A secondary aim was to determine whether the effect of antecedent exercise on the glucoregulatory response to sprinting is affected by sex. Participants (men n = 8; women n = 7) were tested on two occasions during which they either rested ( CON ) or cycled for 60‐min at a moderate intensity of ~65%V ˙ O 2 peak( EX ) before performing a 30‐sec maximal cycling effort 195 min later. In response to the sprint, blood glucose increased to a similar extent between EX and CON trials, peaking at 10 min of recovery, with no difference between sexes ( P > 0.05). Blood glucose then declined at a faster rate in EX , and this was associated with a glucose rate of disappearance ( R d ) that exceeded the glucose rate of appearance ( R a ) earlier in EX compared with CON , although the overall glucose R a and R d profile was higher in men compared with women ( P < 0.05). The response of growth hormone was attenuated during recovery from EX compared with CON ( P < 0.05), with a lower absolute response in women compared with men ( P < 0.05). The response of epinephrine and norepinephrine was also lower in women compared with men ( P < 0.05) but similar between trials. In summary, a prior bout of moderate‐intensity exercise does not affect the magnitude of the glycemia‐increasing response to a 30‐sec sprint; however, the subsequent decline in blood glucose is more rapid. This blood glucose response is similar between men and women, despite less pronounced changes in glucose R a and R d , and a lower response of plasma catecholamines and growth hormone to sprinting in women.