Jan 1, 1989

Spectral analysis on low frequency fluctuation in respiratory rhythm in the decerebrate cat

Biological cybernetics
K KawaharaY Miyamoto


Spectral analysis was performed on the fluctuation in respiratory intervals in vagotomized, paralyzed, and unanesthetized decerebrate cats. The respiratory interval was measured as the time interval between the onset of phrenic neural activity. When endtidal PCO2 was set at the same level as that before immobilization, the power spectral densities of the fluctuation in respiratory intervals were found to be inversely proportional to the frequency in the low frequency range of 0.001-0.1 Hz. All the tested animals showed this type of fluctuation (1/f fluctuation). In contrast, such characteristic 1/f fluctuation disappeared when the end-tidal PCo2 was raised to 50 or 60 mmHg. The spectral profile was almost flat in the frequency range of 0.001-0.1 Hz, i.e. similar to that of "white noise". This study demonstrated that the respiratory rhythm evaluated by phrenic neural discharges exhibited 1/f fluctuation and that the spectral characteristic of the fluctuation in respiratory intervals varied depending on the end-tidal PCo2.

Mentioned in this Paper

Structure of Phrenic Nerve
Body Fluid Discharge
Carbon Dioxide Measurement, Partial Pressure
Felis catus
Decorticate State

Trending Feeds


Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

Head And Neck Squamous Cell Carcinoma

Squamous cell carcinomas account for >90% of all tumors in the head and neck region. Head and neck squamous cell carcinoma incidence has increased dramatically recently with little improvement in patient outcomes. Here is the latest research on this aggressive malignancy.

Signaling in Adult Neurogenesis

Neural stem cells play a critical role in the production of neuronal cells in neurogenesis is of great importance. Of interest is the role signalling mechanisms in adult neurogenesis. Discover the latest research on signalling in adult neurogenesis.

Psychiatric Chronotherapy

Psychiatric Chronotherapy considers the circadian rhythm as a major factor for optimizing therapeutic efficacy of psychiatric interventions. Discover the latest research on Psychiatric Chronotherapy here.

Bone Marrow Neoplasms

Bone Marrow Neoplasms are cancers that occur in the bone marrow. Discover the latest research on Bone Marrow Neoplasms here.

IGA Glomerulonephritis

IgA glomerulonephritis is a chronic form of glomerulonephritis characterized by deposits of predominantly Iimmunoglobin A in the mesangial area. Discover the latest research on IgA glomerulonephritis here.

Cryogenic Electron Microscopy

Cryogenic electron microscopy (Cryo-EM) allows the determination of biological macromolecules and their assemblies at a near-atomic resolution. Here is the latest research.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.