PMID- 17724610
OWN - NLM
STAT- MEDLINE
DCOM- 20080220
LR  - 20181113
IS  - 1439-6319 (Print)
IS  - 1439-6319 (Linking)
VI  - 101
IP  - 4
DP  - 2007 Nov
TI  - Effects of exercise intensity and duration on fat metabolism in trained and 
      untrained older males.
PG  - 525-32
AB  - Advancing age is associated with changes in fat and carbohydrate (CHO) 
      metabolism, which is considered a risk factor for cardiovascular disease and 
      diabetes. The effects of exercise intensity and duration on fat and CHO 
      metabolism in elderly male subjects were investigated in the present study. Seven 
      trained (63.7+/-4.7 years) and six untrained (63.5+/-4.5 years) healthy males 
      performed three 30 min trials on a cycle ergometer at 50, 60 and 70% VO2max and 
      two other trials at 60 and 70% VO2max in which the total energy expenditure was 
      equal to that for 30 min at 50% VO2max Respiratory measures were undertaken 
      throughout the exercise and blood samples taken before and immediately after each 
      trial. Statistical analyses revealed a significant effect of exercise intensity 
      on fat oxidation when the exercise durations were equated as well as when the 
      energy expenditure was held constant for the three trials, though no training 
      effect was noted. Total carbohydrate oxidation increased significantly with 
      exercise intensity (P<0.05) and with training. Significantly higher levels of 
      non-esterified free fatty acid (NEFA) and glycerol were observed for trained 
      compared with untrained though not for B-hydroxybutyrate (3-OH) or insulin. No 
      differences in NEFA, glycerol, 3-OH were evident for increases in exercise 
      intensity. Carbohydrate and fat oxidation are significantly affected by exercise 
      intensity in elderly males, although only CHO oxidation is influenced by 
      training. Furthermore, training-induced increases in the availability of NEFA and 
      glycerol are not associated with an increase in fat oxidation, rather an increase 
      in CHO oxidation.
FAU - Bassami, Minoo
AU  - Bassami M
AD  - Research Institute for Sport and Exercise Sciences, Liverpool John Moores 
      University, Henry Cotton Campus, 15-21 Webster Street, Liverpool, L3 2ET, UK.
FAU - Ahmadizad, Sajad
AU  - Ahmadizad S
FAU - Doran, Dominic
AU  - Doran D
FAU - MacLaren, Donald P M
AU  - MacLaren DP
LA  - eng
PT  - Journal Article
DEP - 20070828
PL  - Germany
TA  - Eur J Appl Physiol
JT  - European journal of applied physiology
JID - 100954790
RN  - 0 (Blood Glucose)
RN  - 0 (Fatty Acids, Nonesterified)
RN  - PDC6A3C0OX (Glycerol)
RN  - TZP1275679 (3-Hydroxybutyric Acid)
SB  - IM
MH  - 3-Hydroxybutyric Acid/blood
MH  - Aged
MH  - Anaerobic Threshold/physiology
MH  - Blood Glucose/metabolism
MH  - Body Composition/physiology
MH  - Carbohydrate Metabolism/physiology
MH  - Energy Metabolism/physiology
MH  - Exercise/*physiology
MH  - Fatty Acids, Nonesterified/blood
MH  - Glycerol/blood
MH  - Humans
MH  - Kinetics
MH  - Lipid Metabolism/*physiology
MH  - Male
MH  - Middle Aged
MH  - Oxidation-Reduction
MH  - Oxygen Consumption/physiology
MH  - Physical Fitness/*physiology
EDAT- 2007/08/29 09:00
MHDA- 2008/02/21 09:00
CRDT- 2007/08/29 09:00
PHST- 2007/07/04 00:00 [accepted]
PHST- 2007/08/29 09:00 [pubmed]
PHST- 2008/02/21 09:00 [medline]
PHST- 2007/08/29 09:00 [entrez]
AID - 10.1007/s00421-007-0523-7 [doi]
PST - ppublish
SO  - Eur J Appl Physiol. 2007 Nov;101(4):525-32. doi: 10.1007/s00421-007-0523-7. Epub 
      2007 Aug 28.