Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/12467
Appears in Collections:Faculty of Health Sciences and Sport Journal Articles
Peer Review Status: Refereed
Title: Sprint interval and traditional endurance training increase net intramuscular triglyceride breakdown and expression of perilipin 2 and 5
Authors: Shepherd, Sam O
Cocks, Matthew
Tipton, Kevin
Ranasinghe, Aaron M
Barker, Thomas A
Burniston, Jatin G
Wagenmakers, Anton J M
Shaw, Christopher S
Contact Email: k.d.tipton@stir.ac.uk
Issue Date: Feb-2013
Publisher: Wiley-Blackwell / Physiological Society
Citation: Shepherd SO, Cocks M, Tipton K, Ranasinghe AM, Barker TA, Burniston JG, Wagenmakers AJM & Shaw CS (2013) Sprint interval and traditional endurance training increase net intramuscular triglyceride breakdown and expression of perilipin 2 and 5, Journal of Physiology, 591 (3), pp. 657-675.
Abstract: Intramuscular triglyceride (IMTG) utilization is enhanced by endurance training (ET) and is linked to improved insulin sensitivity. This study first investigated the hypothesis that ET-induced increases in net IMTG breakdown and insulin sensitivity are related to increased expression of perilipin 2 (PLIN2) and perilipin 5 (PLIN5). Second, we hypothesized that sprint interval training (SIT) also promotes increases in IMTG utilization and insulin sensitivity. Sixteen sedentary males performed 6 weeks of either SIT (4-6, 30 s Wingate tests per session, 3 days week-1) or ET (40-60 min moderate-intensity cycling, 5 days week-1). Training increased resting IMTG content (SIT 1.7-fold, ET 2.4-fold; P less than 0.05), concomitant with parallel increases in PLIN2 (SIT 2.3-fold, ET 2.8-fold; P less than 0.01) and PLIN5 expression (SIT 2.2-fold, ET 3.1-fold; P less than 0.01). Pre-training, 60 min cycling at ∼65% pre-training VO2peak decreased IMTG content in type I fibres (SIT 17 ± 10%, ET 15 ± 12%; P less than 0.05). Following training, a significantly greater breakdown of IMTG in type I fibres occurred during exercise (SIT 27 ± 13%, ET 43 ± 6%; P less than 0.05), with preferential breakdown of PLIN2- and particularly PLIN5-associated lipid droplets. Training increased the Matsuda insulin sensitivity index (SIT 56 ± 15%, ET 29 ± 12%; main effect P less than 0.05). No training × group interactions were observed for any variables. In conclusion, SIT and ET both increase net IMTG breakdown during exercise and increase in PLIN2 and PLIN5 protein expression. The data are consistent with the hypothesis that increases in PLIN2 and PLIN5 are related to the mechanisms that promote increased IMTG utilization during exercise and improve insulin sensitivity following 6 weeks of SIT and ET.
Type: Journal Article
URI: http://hdl.handle.net/1893/12467
DOI Link: http://dx.doi.org/10.1113/jphysiol.2012.240952
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: University of Birmingham
University of Birmingham
Sport
University of Birmingham
University of Birmingham
Liverpool John Moores University
University of Birmingham
University of Birmingham

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