+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Discharge frequencies of single motor units in human diaphragm and parasternal muscles in lying and standing

, : Discharge frequencies of single motor units in human diaphragm and parasternal muscles in lying and standing. Journal of Applied Physiology 90(1): 147-154

Butler, J. E., D. K. McKenzie, and S. C. Gandevia. Discharge frequencies of single motor units in human diaphragm and parasternal muscles in lying and standing. J Appl Physiol 90: 147-154, 2001.--Single motor unit discharge was measured directly in diaphragm and parasternal intercostal muscles to determine whether neural drive to human inspiratory muscles changes between lying and standing. The final discharge frequency of diaphragmatic motor units increased slightly, by 1 Hz (12%; P < 0.01), when subjects were standing [182 units, median 9.1 Hz (interquartile range 7.6-11.3 Hz)] compared with lying supine [159 units, 8.1 Hz (6.6-10.3 Hz)]. However, this increase with standing occurred in only two of six subjects, in one of whom tidal volume increased significantly during standing. Parasternal intercostal motor unit final discharge frequencies did not differ between standing [116 units, 8.0 Hz (6.6-9.6 Hz)] and lying [124 units, 8.4 Hz (7.0-10.3 Hz)]. The discharge frequencies at the onset of inspiration did not differ between lying and standing for either muscle. A larger proportion of motor units in both inspiratory muscles had postinspiratory or tonic expiratory activity for lying compared with standing (15 vs. 4%; P < 0.05). We conclude that there is no major difference in the phasic inspiratory drive to the diaphragm with the change in posture. Reprinted by permission of the publisher.


PMID: 11133905

Other references

MacRitchie, F., 1999: Wheat proteins: characterization and role in flour functionality. Some of the techniques used to characterize wheat proteins are considered along with the relationships between protein composition and dough properties. In addition, approaches for the utilization of this knowledge in breeding for specific end-use...

Hughes, B.W.; Wetherby, K.G.; Kew, G.A.; Lewis, D.L., 1990: An assessment of wind erosion on Eyre Peninsula during 1988/89. This publication records and comments on the severity and extent of wind erosion on Eyre Peninsula, South Australia, and the factors which influenced it. Recommendations are made about future directions required to reduce wind erosion, not only in...

Szabo, M.; Frohman, L.A., 1976: Dissociation of prolactin-releasing activity from thyrotropin-releasing hormone in porcine stalk median eminence. The prolactin (PRL)-releasing activity of porcine stalk median eminence (pSME) was characterized by an in vivo bioassay and concomitant radioi-munoassay of plasma PRL and thyrotropin (TSH) levels. Methanol extracts of pSME stimulated PRL release i...

Trubac, E.R.; Sequin, C.J., 1971: Business-oriented planning techniques for religious communities. Hospital Progress 52(4): 49-52 Passim

Pearson, G.D.; Zimmerman, E.F., 1969: Inhibition of poliovirus replication by N-methylisatin-beta-4':4'-dibutylthiosemicarbazone. Virology 38(4): 641-650

Lombard, P.; Aubaniac, R.; Frailong, J., 1951: Thrombosis due to compression of the humeral artery by the apparatus of a native bonesetter. Afrique Francaise Chirurgicale 1: 70-72

Wojtusiak J., 1966: Macro lepidoptera fauna of the gubalowak elevation poland and its zoo geographical characteristic. Acta Zoologica Cracoviensia 11(4): 75-109

Mann, K.; Eigler, F.W.; Leder, L.D., 1995: Pathology of adrenal tumors. Onkologie 18(5): 474-476

Vaisrub, S., 1972: The cephalic phase of exocrine and endocrine pancreatic secretion. JAMA 220(3): 409-409

Shen J.; Chang R.; Zeng L.; Y.L.; H.C.; Guan Q.; Guan K.; Zhang L., 1982: A study of the etiology of infantile respiratory syncytial virus pneumonia infantile in guangzhou china. Studies of the etiology of respiratory syncytial virus (RSV) pneumonia of children in Guangzhou are reported. All cases were confirmed by virus isolation and/or serological methods, RSV is the causal agent in 82 of 275 cases (29.8%) and is the mos...