Abstract
Age-related differences in energy expenditure, fat oxidation, and norepinephrine (NE) kinetics after caffeine ingestion were examined using a placebo-controlled double-blind study in 10 older (O, 65-80 yr) and 10 younger (Y, 19-26 yr) men who were moderate consumers of caffeine. Caffeine ingestion resulted in similar increases in Y and O men for plasma caffeine levels (Y = 89 ± 100 to 6,340 ± 1,938 ng/ml, P < 0.05; O = 124 ± 38 to 7,066 ± 2,366 ng/ml, P < 0.05) and energy expenditure (Y = 11%, 1.38 ± 0.15 to 1.52 ± 0.22 kcal/min, P < 0.05; O = 9.5%, 1.15 ± 0.13 to 1.26 ± 0.20 kcal/min, P < 0.05). However, caffeine ingestion increased fatty acid concentrations (362 ± 159 to 803 ± 253 μmol/l, P < 0.05) and tended to increase rate of appearance of fatty acids (624 ± 376 to 1,394 ± 1,331 μmol/l, P = 9.07) in younger but not older men. Rates of fat oxidation and NE appearance and clearance did not significantly differ from baseline values in either group. In conclusion, older and younger men show a similar thermogenic response to caffeine ingestion, whereas older men show a smaller increase in fatty acid availability after a caffeine challenge. These metabolic differences are not related to alterations in NE kinetics or fat oxidation.
| Original language | English (US) |
|---|---|
| Pages (from-to) | E1192-E1198 |
| Journal | American Journal of Physiology - Endocrinology and Metabolism |
| Volume | 268 |
| Issue number | 6 31-6 |
| State | Published - Jan 1 1995 |
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All Science Journal Classification (ASJC) codes
- Endocrinology, Diabetes and Metabolism
- Physiology
- Physiology (medical)
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Effects of caffeine ingestion on NE kinetics, fat oxidation, and energy expenditure in younger and older men. / Arciero, P. J.; Gardner, A. W.; Calles-Escandon, J.; Benowitz, N. L.; Poehlman, E. T.
In: American Journal of Physiology - Endocrinology and Metabolism, Vol. 268, No. 6 31-6, 01.01.1995, p. E1192-E1198.Research output: Contribution to journal › Article
TY - JOUR
T1 - Effects of caffeine ingestion on NE kinetics, fat oxidation, and energy expenditure in younger and older men
AU - Arciero, P. J.
AU - Gardner, A. W.
AU - Calles-Escandon, J.
AU - Benowitz, N. L.
AU - Poehlman, E. T.
PY - 1995/1/1
Y1 - 1995/1/1
N2 - Age-related differences in energy expenditure, fat oxidation, and norepinephrine (NE) kinetics after caffeine ingestion were examined using a placebo-controlled double-blind study in 10 older (O, 65-80 yr) and 10 younger (Y, 19-26 yr) men who were moderate consumers of caffeine. Caffeine ingestion resulted in similar increases in Y and O men for plasma caffeine levels (Y = 89 ± 100 to 6,340 ± 1,938 ng/ml, P < 0.05; O = 124 ± 38 to 7,066 ± 2,366 ng/ml, P < 0.05) and energy expenditure (Y = 11%, 1.38 ± 0.15 to 1.52 ± 0.22 kcal/min, P < 0.05; O = 9.5%, 1.15 ± 0.13 to 1.26 ± 0.20 kcal/min, P < 0.05). However, caffeine ingestion increased fatty acid concentrations (362 ± 159 to 803 ± 253 μmol/l, P < 0.05) and tended to increase rate of appearance of fatty acids (624 ± 376 to 1,394 ± 1,331 μmol/l, P = 9.07) in younger but not older men. Rates of fat oxidation and NE appearance and clearance did not significantly differ from baseline values in either group. In conclusion, older and younger men show a similar thermogenic response to caffeine ingestion, whereas older men show a smaller increase in fatty acid availability after a caffeine challenge. These metabolic differences are not related to alterations in NE kinetics or fat oxidation.
AB - Age-related differences in energy expenditure, fat oxidation, and norepinephrine (NE) kinetics after caffeine ingestion were examined using a placebo-controlled double-blind study in 10 older (O, 65-80 yr) and 10 younger (Y, 19-26 yr) men who were moderate consumers of caffeine. Caffeine ingestion resulted in similar increases in Y and O men for plasma caffeine levels (Y = 89 ± 100 to 6,340 ± 1,938 ng/ml, P < 0.05; O = 124 ± 38 to 7,066 ± 2,366 ng/ml, P < 0.05) and energy expenditure (Y = 11%, 1.38 ± 0.15 to 1.52 ± 0.22 kcal/min, P < 0.05; O = 9.5%, 1.15 ± 0.13 to 1.26 ± 0.20 kcal/min, P < 0.05). However, caffeine ingestion increased fatty acid concentrations (362 ± 159 to 803 ± 253 μmol/l, P < 0.05) and tended to increase rate of appearance of fatty acids (624 ± 376 to 1,394 ± 1,331 μmol/l, P = 9.07) in younger but not older men. Rates of fat oxidation and NE appearance and clearance did not significantly differ from baseline values in either group. In conclusion, older and younger men show a similar thermogenic response to caffeine ingestion, whereas older men show a smaller increase in fatty acid availability after a caffeine challenge. These metabolic differences are not related to alterations in NE kinetics or fat oxidation.
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M3 - Article
C2 - 7611396
AN - SCOPUS:0029077753
VL - 268
SP - E1192-E1198
JO - American Journal of Physiology
JF - American Journal of Physiology
SN - 0193-1849
IS - 6 31-6
ER -