Effects of hindlimb contraction on pressor and muscle interstitial metabolite responses in the cat

被引:35
作者
MacLean, D
LaNoue, KF
Gray, KS
Sinoway, LI
机构
[1] Penn State Univ, Milton S Hershey Med Ctr, Coll Med, Cardiol Sect, Hershey, PA 17033 USA
[2] Penn State Univ, Milton S Hershey Med Ctr, Coll Med, Dept Cellular & Mol Physiol, Hershey, PA 17033 USA
[3] Vet Affairs Med Ctr, Lebanon, PA 17042 USA
关键词
microdialysis; potassium; pH; phosphate; lactate; decerebration;
D O I
10.1152/jappl.1998.85.4.1583
中图分类号
Q4 [生理学];
学科分类号
071003 ;
摘要
We used the microdialysis technique to measure the interstitial concentration of several putative metabolic stimulants of the exercise presser reflex during 3- and 5-Hz twitch contractions in the decerebrate cat. The peak increases in heart rate and mean arterial pressure during contraction were 20 +/- 5 beats/min and 21 +/- 8 mmHg and 27 +/- 9 beats/min and 37 +/- 12 mmHg for the 3- and 5-Hz stimulation protocols, respectively. All variables returned to baseline after 10 min of recovery. Interstitial lactate rose (P < 0.05) by 0.41 +/- 0.15 and 0.56 +/- 0.16 mM for the 3- and 5-Hz stimulation protocols, respectively, and were not statistically different from one another. Interstitial lactate levels remained above (P < 0.05) baseline during recovery in the 5-Hz group. Dialysate phosphate concentrations (corrected for shifts in probe recovery) rose with stimulation (P < 0.05) by 0.19 +/- 0.08 and 0.11 +/- 0.03 mM for the 3- and 5-Hz protocols. There were no differences between groups. The resting dialysate K+ concentrations for the 3- and 5-Hz conditions were 4.0 +/- 0.1 and 3.9 +/- 0.1 meq/l, respectively. During stimulation the dialysate K+ concentrations rose steadily for both conditions, and the increase from rest to stimulation (P < 0.05) was 0.57 +/- 0.19 and 0.81 +/- 0.06 meq/l for the 3- and 5-Hz conditions, respectively, with no differences between groups. Resting dialysate pH was 6.915 +/- 0.055 and 6.981 +/- 0.032 and rose to 7.013 (P < 0.05) and 7.053 (P < 0.05) for the 3- and 5-Hz conditions, respectively, and then became acidotic (6.905, P < 0.05) during recovery (5 Hz only). This study represents the first time simultaneous measurements of multiple skeletal muscle interstitial metabolites and presser responses to twitch contractions have been made in the cat. These data suggest that interstitial K+ and phosphate, but not lactate and H+, may contribute to the stimulation of thin fiber muscle afferents during contraction.
引用
收藏
页码:1583 / 1592
页数:10
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