Browsing by Subject "physiology"

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    Analysis of heart rate variability
    (1997) Donovan, Reece Garethe; Scott-Millar; Rob
    Instantaneous heart rate is the reciprocal of the time interval between adjacent QRS complexes in the ECG signal. Heart rate variability analysis is the study of changes in instantaneous heart rate over time. Decreased heart rate variability has been shown to be a powerful predictor of sudden cardiac death syndrome and is also associated with a variety of both pathologic and non-pathologic conditions. A comprehensive literature survey was conducted on the physiological aspects of heart rate control and the techniques used for generating and analysing the heart rate variability signal. Four ECG databases were created from appropriately selected Holter ECG recordings. A computer-based heart rate variability analysis system was then developed. This accepts both single and dual channel ECG signals for processing. The system allows for review and correction of the processed signal. A number of analysis techniques were selected from the literature and implemented. These include time domain measures (mean, standard deviation, SDANN, SDANNi, variance, rMSSD, pNN50 and coefficient of variation), frequency domain techniques (Fourier and auto-regressive modelling for power spectral analysis) and non-linear analytic techniques (histogram, return maps, recurrent plot analysis). The system was calibrated to ensure correct operation. A pilot study was performed to check the QRS detection module. The overall sensitivity results indicate a 99.14 % detection success and a 1.36 % detection failure. The system developed provides a platform for clinical studies of heart rate variability.
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    Beyond the VO2 max: the role of self-belief in elite athletic performance
    (2011) Noakes, Tim
    In the past Prof. Tim Noakes was convinced that physiology could explain performance. After 38 years of studying the human body, he now believes that the mind, and the role of self-belief, are crucial factors in human athletic feats. In January 2008, Noakes presented this lecture entitled “Beyond the VO2 max: The role of self-belief in elite athletic performance” at Croke Park Stadium, Dublin. This lecture explores how success in sports ranging from extreme cold water swimming to World Cup rugby are linked by a common thread - the role of self-belief.
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    Time to move beyond a brainless physiology
    (2011) Noakes, Tim
    According to Noakes, not enough people are looking at the bigger picture that the body does not function in discrete and unconnected apartments.He argues that too much of exercise physiology concentrates on the body’s reflexive automatic response to stimuli of shutting down close to the point of collapse. Exercise is a complex behavior that is regulated by a complex system. In this talk, Prof Noakes seeks to include the brain as a factor in exercise physiology. He starts with the classical teachings in exercise physiology and continues by looking at various models such as the A.V. Hill model and the peripheral model.