Prior exercise delays the onset of acidosis during incremental exercise.
In: Journal of Applied Physiology, Jg. 102 (2007-05-01), Heft 5, S. 1799-1805
Online
academicJournal
Zugriff:
The effects of prior moderate- and prior heavy-intensity exercise on the subsequent metabolic response to incremental exercise were examined. Healthy, young adult subjects (n = 8) performed three randomized plantar-flexion exercise tests: 1) an incremental exercise test (~0.6 W/min) to volitional fatigue (Ramp); 2) Ramp preceded by 6 mm of moderate-intensity, constant-load exercise below the intracellular pH threshold (pHT; Mod-Ramp); and 3) Ramp preceded by 6 mm of heavy-intensity, constant-load exercise above pHT (Hvy-Ramp); the constant-load and incremental exercise periods were separated by 6 mm of rest. 31 P-magnetic resonance spectroscopy was used to continuously monitor intracellular pH, phosphocreatine concentration ([PCr]), and inorganic phosphate concentration ([P i ]). No differences in exercise performance or the metabolic response to exercise were observed between Ramp and Mod-Ramp. However, compared with Ramp, a 14% (SD 10) increase (P < 0.01) in peak power output (PPO) was observed in Hvy-Ramp. The improved exercise performance in Hvy-Ramp was accompanied by a delayed (P = 0.01) onset of intracellular acidosis [Hvy-Ramp 60.4% PPO (SD 11.7) vs. Ramp 45.8% PPO (SD 9.4)] and a delayed (P < 0.01) onset of rapid increases in [P i ]/[PCr] [Hvy-Ramp 61.5% PPO (SD 12.0) vs. Ramp 45.1% PPO (SD 9.1)]. In conclusion, prior heavy-intensity exercise delayed the onset of intracellular acidosis and enhanced exercise performance during a subsequent incremental exercise test. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Applied Physiology is the property of American Physiological Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Titel: |
Prior exercise delays the onset of acidosis during incremental exercise.
|
---|---|
Autor/in / Beteiligte Person: | Raymer, Graydon H. ; Forbes, Sean C. ; Kowalchuk, John M. ; Thompson, R. Terry ; Marsh, Greg D. |
Link: | |
Zeitschrift: | Journal of Applied Physiology, Jg. 102 (2007-05-01), Heft 5, S. 1799-1805 |
Veröffentlichung: | 2007 |
Medientyp: | academicJournal |
ISSN: | 8750-7587 (print) |
DOI: | 10.1152/japplphysiol.01151.2006 |
Schlagwort: |
|
Sonstiges: |
|