Difference between revisions of "Gibala 1998 Am J Physiol Endocrinol Metab"
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{{Publication | {{Publication | ||
|title=Gibala MJ, MacLean DA, Graham TE, Saltin B (1998) Tricarboxylic acid cycle intermediate pool size and estimated cycle flux in human muscle during exercise. Am J Physiol Endocrinol Metab 275: E235- | |title=Gibala MJ, MacLean DA, Graham TE, Saltin B (1998) Tricarboxylic acid cycle intermediate pool size and estimated cycle flux in human muscle during exercise. Am J Physiol Endocrinol Metab 275:E235-42. | ||
|info=[http://www.ncbi.nlm.nih.gov/pubmed/9688624 PMID: 9688624 Open Access] | |info=[http://www.ncbi.nlm.nih.gov/pubmed/9688624 PMID: 9688624 Open Access] | ||
|authors=Gibala MJ, MacLean DA, Graham TE, Saltin B | |authors=Gibala MJ, MacLean DA, Graham TE, Saltin B | ||
|year=1998 | |year=1998 | ||
|journal=Am J Physiol Endocrinol Metab | |journal=Am J Physiol Endocrinol Metab | ||
|abstract=We examined the relationship between [[tricarboxylic acid]] (TCA) cycle intermediate (TCAI) pool size, TCA cycle flux (calculated from leg O<sub>2</sub> uptake), and [[pyruvate dehydrogenase]] activity (PDHa) in human skeletal muscle. Six males performed moderate leg extensor exercise for 10 min, followed immediately by intense exercise until exhaustion (3.8 +/- 0.5 min). The sum of seven measured TCAI (SigmaTCAI) increased (''P'' </= 0.05) from 1.39 +/- 0.11 at rest to 2. 88 +/- 0.31 after 10 min and to 5.38 +/- 0.31 mmol/kg dry wt at exhaustion. TCA cycle flux increased approximately 70-fold during submaximal exercise and was approximately 100-fold higher than rest at exhaustion. PDHa corresponded to 77 and 90% of TCA cycle flux during submaximal and maximal exercise, respectively. The present data demonstrate that a tremendous increase in TCA cycle flux can occur in skeletal muscle despite a relatively small change in TCAI pool size. It is suggested that the increase in SigmaTCAI during exercise may primarily reflect an imbalance between the rate of pyruvate production and its rate of oxidation in the TCA cycle. | |abstract=We examined the relationship between [[TCA cycle|tricarboxylic acid]] (TCA) cycle intermediate (TCAI) pool size, TCA cycle flux (calculated from leg O<sub>2</sub> uptake), and [[pyruvate dehydrogenase]] activity (PDHa) in human skeletal muscle. Six males performed moderate leg extensor exercise for 10 min, followed immediately by intense exercise until exhaustion (3.8 +/- 0.5 min). The sum of seven measured TCAI (SigmaTCAI) increased (''P'' </= 0.05) from 1.39 +/- 0.11 at rest to 2. 88 +/- 0.31 after 10 min and to 5.38 +/- 0.31 mmol/kg dry wt at exhaustion. TCA cycle flux increased approximately 70-fold during submaximal exercise and was approximately 100-fold higher than rest at exhaustion. PDHa corresponded to 77 and 90% of TCA cycle flux during submaximal and maximal exercise, respectively. The present data demonstrate that a tremendous increase in TCA cycle flux can occur in skeletal muscle despite a relatively small change in TCAI pool size. It is suggested that the increase in SigmaTCAI during exercise may primarily reflect an imbalance between the rate of pyruvate production and its rate of oxidation in the TCA cycle. | ||
}} | }} | ||
== Cited by == | |||
{{Template:Cited by Gnaiger 2020 BEC MitoPathways}} | |||
{{Labeling | {{Labeling | ||
|organism=Human | |organism=Human | ||
|tissues=Skeletal muscle | |tissues=Skeletal muscle | ||
|topics=Substrate | |topics=Substrate | ||
|additional=BEC 2020.2 | |||
}} | }} | ||
Latest revision as of 17:06, 16 January 2021
| Gibala MJ, MacLean DA, Graham TE, Saltin B (1998) Tricarboxylic acid cycle intermediate pool size and estimated cycle flux in human muscle during exercise. Am J Physiol Endocrinol Metab 275:E235-42. |
Gibala MJ, MacLean DA, Graham TE, Saltin B (1998) Am J Physiol Endocrinol Metab
Abstract: We examined the relationship between tricarboxylic acid (TCA) cycle intermediate (TCAI) pool size, TCA cycle flux (calculated from leg O2 uptake), and pyruvate dehydrogenase activity (PDHa) in human skeletal muscle. Six males performed moderate leg extensor exercise for 10 min, followed immediately by intense exercise until exhaustion (3.8 +/- 0.5 min). The sum of seven measured TCAI (SigmaTCAI) increased (P </= 0.05) from 1.39 +/- 0.11 at rest to 2. 88 +/- 0.31 after 10 min and to 5.38 +/- 0.31 mmol/kg dry wt at exhaustion. TCA cycle flux increased approximately 70-fold during submaximal exercise and was approximately 100-fold higher than rest at exhaustion. PDHa corresponded to 77 and 90% of TCA cycle flux during submaximal and maximal exercise, respectively. The present data demonstrate that a tremendous increase in TCA cycle flux can occur in skeletal muscle despite a relatively small change in TCAI pool size. It is suggested that the increase in SigmaTCAI during exercise may primarily reflect an imbalance between the rate of pyruvate production and its rate of oxidation in the TCA cycle.
Cited by
- Gnaiger E (2020) Mitochondrial pathways and respiratory control. An introduction to OXPHOS analysis. 5th ed. Bioenerg Commun 2020.2. https://doi.org/10.26124/bec:2020-0002
Labels:
Organism: Human
Tissue;cell: Skeletal muscle
Regulation: Substrate
BEC 2020.2
