CHO 2 studied Flashcards
Coyle et al 1986
Does feeding of CHO during prolonged exercise slow the rate of glycogen depletion
exercise at 70% VO2 max and consumed placebo or CHO drink
CHO drink = 1 hour longer to fatigue but no difference in rate of glycogen depletion
Bergstrom and Hultman 1966
does exercise to depleat glycogen stores increase the amount of glycogen which can be stored in the muscles
Unilateral cycling to exhaustion
biopsies
2 days of CHO feeding
muscle glycogen increased to greater extent in exercised leg
exceeded rested leg levels after 1 day
Sherman et al 1981
what is the best amount of CHO to consume to achieve glycogen supercompensation following depletion
low/high vs med/high vs med/med
following 5 day glycogen depletion taper
biopsies for glycogen levels
low/high and med/high = same level of muscle glycogen reached
Bussau et al 2002
How long does it take to maximally increase glycogen stores with a high CHO diet
10g/kg/day CHO for 3 days consumed
muscle biopsy at days 1 and 3
muscle glycogen significantly increased after 1 day
No further sig increase by day 3
Ivy et al 1988
optimal time for CHO ingestion post exercise in order to achieve max glycogen resynthesis
deplete glycogen on cycle ergometer
CHO either immediately after or 2 hours after
muscle biopsies at 0, 2, 4 hrs and blood tests
immediate feed = greater rate of synthesis at 0-2 hours
same rate at 2-4 hours
so overall rate greater for immediate feed
Hansen et al 2005
Does training with lower muscle glycogen content = greater skeletal muscle adaptation
knee extensor exercise with one leg glycogen depleated and the other not
(both trained, then rested whilst fasted, then one trained again)
time to exhaustion was greater in leg trained with lower glycogen
significantly greater increase in 3-hydroxyacyl dehydrogenase
also greater increase in citrate synthase
Hulston et al 2010
does training with low glycogen improve performance and adaptation
high vs low gylcogen training
(1 x daily or 2x every 2nd day)
muscle biopsy, blood test and metabolic measures
time trial performance improved to same extent
low = greater increase in fat oxidation and beta hydroxyacyl COA dehydrogenase
