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Full-Text Articles in Life Sciences
Postsynaptic Modulation Of Rectifying Electrical Synaptic Inputs To The Lg Escape Command Neuron In Crayfish, Donald H. Edwards, William J. Heitler, Esther M. Leise, Russell A. Fricke
Postsynaptic Modulation Of Rectifying Electrical Synaptic Inputs To The Lg Escape Command Neuron In Crayfish, Donald H. Edwards, William J. Heitler, Esther M. Leise, Russell A. Fricke
Neuroscience Institute Faculty Publications
The lateral giant (LG) tail-flip escape system of crayfish is organized to provide a massive convergence of mechanosensory inputs onto the LG command neuron through electrical synapses from both mechanosensory afferents and interneurons. We used electrophysiological techniques to show that the connections between three major mechanosensory interneurons and LG rectify, and that their inputs to LG can be reduced by postsynaptic depolarization and increased by postsynaptic hyperpolarization. The mechanosensory afferents and interneurons are excited by sensory nerve shock, and the components of the resulting LG PSP can be similarly modulated by the same postsynaptic potential changes. Because these inputs are …
Mutual Inhibition Among Neural Command Systems As A Possible Mechanism For Behavioral Choice In Crayfish, Donald H. Edwards
Mutual Inhibition Among Neural Command Systems As A Possible Mechanism For Behavioral Choice In Crayfish, Donald H. Edwards
Neuroscience Institute Faculty Publications
Mutual inhibition among behavioral command systems frequently has been suggested as a possible mechanism for switching between incompatible behaviors. Several neural circuits in crayfish that mediate incompatible behaviors have been found to interact through inhibition; this accounts for increased stimulus threshold of one behavior (e.g., escape tailflip) during performance of others (eating, walking, defense). To determine whether mutual inhibition between command systems can provide a mechanism that produces adaptive behavior, I developed a model crayfish that uses this mechanism to govern its behavioral choices in a simulated world that contains a predator, a shelter, and a food source. The crayfish …
A Physiologic Evaluation Of The Sports Massage, Tommy Boone, Rae Cooper, Walter R. Thompson
A Physiologic Evaluation Of The Sports Massage, Tommy Boone, Rae Cooper, Walter R. Thompson
Kinesiology Faculty Publications
This study determines the physiological responses of 10 healthy college-age subjects during submaximal exercise on the treadmill with and without a prior 30-minute sports massage. The Beckman Metabolic Measurement Cart was used to determine the subjects' steady-state responses. Cardiac output was determined by the indirect CO2 Fick method; mixed venous PCO2 was calculated using the equilibrium CO 2 rebreathing method. No significant differences in central (HR, SV, Q) or peripheral (a-v~O2 diff) responses were found between the two submaximal exercise tests. Also, there were no significant differences in lactic acid (LA) and blood pressure responses. The results indicate that massage …
Creatine Kinase, Creatine Kinase‑Mm, And The Isoforms Of Creatine Kinase‑Mm Following A Competitive Swimming Workout, Mark H. Bean, Hugh M. Neisler, Walter R. Thompson, Margot Hall, Tony Young, John Pittington
Creatine Kinase, Creatine Kinase‑Mm, And The Isoforms Of Creatine Kinase‑Mm Following A Competitive Swimming Workout, Mark H. Bean, Hugh M. Neisler, Walter R. Thompson, Margot Hall, Tony Young, John Pittington
Kinesiology Faculty Publications
Serum levels of total creatine kinase (CK), CK-MM and the isoform of CD-MM were measured in 14 male competitive collegiate swimmers. The purpose of this study was to observe changes in CK and the isoforms of CK-MM following a competitive swim training session. Venous blood samples were taken before and immediately following a 5550 yard training session. The main series in the workout consisted of a 27 minute, minimal rest interval set designed to obtain a moderately heavy physical effort. Total CK, composed predominantly of CK-MM, increased significantly (p