M J Lewis

Summary

Affiliation: University of Wales
Country: UK

Publications

  1. doi request reprint Multifractal characterisation of electrocardiographic RR and QT time-series before and after progressive exercise
    M J Lewis
    College of Engineering, Swansea University, Swansea, UK
    Comput Methods Programs Biomed 108:176-85. 2012
  2. doi request reprint Older people's cardiac responses as indicators of stress in familiar and unfamiliar environments
    M J Lewis
    College of Engineering, Swansea University, Swansea, UK
    Psychophysiology 49:478-83. 2012
  3. ncbi request reprint Sample entropy of electrocardiographic RR and QT time-series data during rest and exercise
    M J Lewis
    Department of Sports Science, University of Wales Swansea, Swansea, UK
    Physiol Meas 28:731-44. 2007
  4. doi request reprint Influence of smoking abstinence and nicotine replacement therapy on heart rate and QT time-series
    M J Lewis
    School of Engineering, Swansea University, Wales, UK
    Clin Physiol Funct Imaging 30:43-50. 2010
  5. doi request reprint Influence of long-term oxygen therapy on heart rate and QT time-series in hypoxic patients with chronic obstructive pulmonary disease
    Michael J Lewis
    School of Engineering, Swansea University, Wales, UK
    Clin Physiol Funct Imaging 29:431-9. 2009
  6. doi request reprint Influence of long-term oxygen therapy on cardiac acceleration and deceleration capacity in hypoxic patients with chronic obstructive pulmonary disease
    M J Lewis
    College of Engineering, Swansea University, Wales, UK
    Clin Physiol Funct Imaging 31:258-65. 2011
  7. doi request reprint Relationship between electrocardiographic RR and QT interval variabilities and indices of ventricular function in healthy subjects
    M J Lewis
    School of Human Sciences, Swansea University, Vivian Building, Singleton Park, Swansea SA2 8PP, UK
    Physiol Meas 29:1-13. 2008
  8. ncbi request reprint Rate of reduction of heart rate variability during exercise as an index of physical work capacity
    M J Lewis
    Applied Physiology in Sport Group, Department of Sports Science, University of Wales Swansea, Swansea, Wales, UK
    Scand J Med Sci Sports 17:696-702. 2007
  9. ncbi request reprint Analysis of the QT interval and its variability in healthy adults during rest and exercise
    M J Lewis
    Department of Sports Science, University of Wales Swansea, Vivian Building, Singleton Park, Swansea SA2 8PP, UK
    Physiol Meas 27:1211-26. 2006
  10. ncbi request reprint Autonomic nervous system control of the cardiovascular and respiratory systems in asthma
    M J Lewis
    Department of Sports Science, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK
    Respir Med 100:1688-705. 2006

Detail Information

Publications24

  1. doi request reprint Multifractal characterisation of electrocardiographic RR and QT time-series before and after progressive exercise
    M J Lewis
    College of Engineering, Swansea University, Swansea, UK
    Comput Methods Programs Biomed 108:176-85. 2012
    ..This exploratory study indicates the possibility of using physical exercise in conjunction with multifractal methodology as an adjunctive description of autonomically mediated modulation of heart rate...
  2. doi request reprint Older people's cardiac responses as indicators of stress in familiar and unfamiliar environments
    M J Lewis
    College of Engineering, Swansea University, Swansea, UK
    Psychophysiology 49:478-83. 2012
    ..There were no gender-related differences in cardiac responses. HRV is a useful surrogate of cardiac stress when assessing older people's responses to their environments...
  3. ncbi request reprint Sample entropy of electrocardiographic RR and QT time-series data during rest and exercise
    M J Lewis
    Department of Sports Science, University of Wales Swansea, Swansea, UK
    Physiol Meas 28:731-44. 2007
    ..We speculate that greater complexity in QT data might be explained by a direct ANS influence on the ventricular myocardium...
  4. doi request reprint Influence of smoking abstinence and nicotine replacement therapy on heart rate and QT time-series
    M J Lewis
    School of Engineering, Swansea University, Wales, UK
    Clin Physiol Funct Imaging 30:43-50. 2010
    ..Our results provide tentative evidence that electrocardiographic improvements during a cold-turkey smoking quit attempt (acute nicotine withdrawal) are maintained during NRT pharmacotherapy...
  5. doi request reprint Influence of long-term oxygen therapy on heart rate and QT time-series in hypoxic patients with chronic obstructive pulmonary disease
    Michael J Lewis
    School of Engineering, Swansea University, Wales, UK
    Clin Physiol Funct Imaging 29:431-9. 2009
    ..We examined the influence of long-term oxygen therapy (LTOT) on heart rate (RR) and QT time-series in COPD...
  6. doi request reprint Influence of long-term oxygen therapy on cardiac acceleration and deceleration capacity in hypoxic patients with chronic obstructive pulmonary disease
    M J Lewis
    College of Engineering, Swansea University, Wales, UK
    Clin Physiol Funct Imaging 31:258-65. 2011
    ..We postulated that these methods can help assess the integrity of cardiac control in hypoxic COPD...
  7. doi request reprint Relationship between electrocardiographic RR and QT interval variabilities and indices of ventricular function in healthy subjects
    M J Lewis
    School of Human Sciences, Swansea University, Vivian Building, Singleton Park, Swansea SA2 8PP, UK
    Physiol Meas 29:1-13. 2008
    ..We conclude that the QTVI is a reasonably consistent measure of the cardiac ventricular function, and as such is a more useful index than other parameters based on RR or QT interval alone...
  8. ncbi request reprint Rate of reduction of heart rate variability during exercise as an index of physical work capacity
    M J Lewis
    Applied Physiology in Sport Group, Department of Sports Science, University of Wales Swansea, Swansea, Wales, UK
    Scand J Med Sci Sports 17:696-702. 2007
    ..005) in both genders. The HRV decay constants for the LF and HF bf bandwidths appear to provide an indication of work capacity from submaximal exercise, without prior assumption regarding heart rate and its relationship with work rate...
  9. ncbi request reprint Analysis of the QT interval and its variability in healthy adults during rest and exercise
    M J Lewis
    Department of Sports Science, University of Wales Swansea, Vivian Building, Singleton Park, Swansea SA2 8PP, UK
    Physiol Meas 27:1211-26. 2006
    ..QTVI can be used to quantify the relative autonomic influence on the atrial and ventricular myocardium during rest and exercise, and might be related to HR-dependent and HR-independent influences on the QT interval...
  10. ncbi request reprint Autonomic nervous system control of the cardiovascular and respiratory systems in asthma
    M J Lewis
    Department of Sports Science, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK
    Respir Med 100:1688-705. 2006
    ..The full extent of autonomic dysfunction, and its clinical implications, has yet to be fully determined and should be the subject of future investigation...
  11. ncbi request reprint Hysteresis of electrocardiographic depolarization-repolarization intervals during dynamic physical exercise and subsequent recovery
    M J Lewis
    Department of Sports Science, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK
    Physiol Meas 27:191-201. 2006
    ..QT(a)-NN hysteresis is significantly affected by the locations of the ECG electrodes used to record the surface ECG. These results emphasize the need for standardization of ECG electrode placement in future investigations...
  12. ncbi request reprint Heart rate variability analysis: a tool to assess cardiac autonomic function
    Michael J Lewis
    Department of Sports Science, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, Wales, UK
    Comput Inform Nurs 23:335-41. 2005
    ..quot; HRV analysis therefore provides a noninvasive method for investigating the dynamic influence of changing physiological parameters on cardiac regulation...
  13. ncbi request reprint Review of electromagnetic source investigations of the fetal heart
    Michael J Lewis
    Department of Sports Science, Vivian Building, University of Wales Swansea, Swansea SA2 8PP, UK
    Med Eng Phys 25:801-10. 2003
    ..Fetal magnetocardiography and the fetal vectorcardiogram may thus provide important additions to current methods of antenatal monitoring...
  14. ncbi request reprint Biomagnetism: a new tool in sport and exercise science
    Michael J Lewis
    Department of Sports Science, Vivian Building, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, UK
    J Sports Sci 21:793-802. 2003
    ..Further investigations of biomagnetometry in this discipline should focus on three main areas: cardiology, encephalography and neurology, and body composition assessment...
  15. ncbi request reprint Computer-assisted learning for teaching anatomy and physiology in subjects allied to medicine
    Michael J Lewis
    Department of Sports Science, University of Wales Swansea, Swansea
    Med Teach 25:204-6. 2003
    ..A brief survey is presented which examines those studies that have investigated the utility of CAL for teaching anatomy and physiology within subjects allied to medicine...
  16. doi request reprint Exercise and cardiac regulation: what can electrocardiographic time series tell us?
    M J Lewis
    School of Engineering, Swansea University, Swansea, UK
    Scand J Med Sci Sports 20:794-804. 2010
    ..g. providing feedback on the cardiac effects of training), the clinician (assisting in cardiovascular screening and exercise therapy evaluation) and the exercise physiologist (providing data for physiological process modelling)...
  17. ncbi request reprint Comparison of Polar 810s and an ambulatory ECG system for RR interval measurement during progressive exercise
    M Kingsley
    Department of Sports Science, University of Wales, Swansea, UK
    Int J Sports Med 26:39-44. 2005
    ..4 are in good agreement. However, caution should be exercised when interpreting spectral analysis of RR interval data derived from different acquisition systems during physical activity...
  18. doi request reprint Home telemonitoring and quality of life in stable, optimised chronic obstructive pulmonary disease
    Keir E Lewis
    Prince Philip Hospital, Llanelli, UK
    J Telemed Telecare 16:253-9. 2010
    ..The study showed that telemonitoring was safe but, despite being well used, it was not associated with changes in quality of life in patients who had stable COPD...
  19. doi request reprint Temporal changes in glucose and insulin homeostasis after biliopancreatic diversion and laparoscopic adjustable gastric banding
    I Alam
    Department of Surgery, Morriston Hospital, ABM University Health Board, Swansea, Wales, United Kingdom
    Surg Obes Relat Dis 8:752-63. 2012
    ..The setting was the Department of Surgery, Morriston Hospital (Swansea, Wales, United Kingdom)...
  20. doi request reprint Interaction between age and aerobic fitness in determining heart rate dynamics
    M A McNarry
    College of Engineering, Swansea University, Wales, UK
    Physiol Meas 33:901-14. 2012
    ..However, given the clinical importance of diminished HRV and the immutable nature of aging, the potential significance of physical activity/training to enhance cardiac regulatory function should not be underestimated...
  21. doi request reprint Linear and nonlinear characteristics of heart rate time series in obesity and during weight-reduction surgery
    I Alam
    Department of Surgery, Morriston Hospital, Swansea, UK
    Physiol Meas 30:541-57. 2009
    ..The multifractal method appears to be a more sensitive measure of integrated cardiac autonomic function than linear methods for these patients...
  22. ncbi request reprint A review of evaluative studies of computer-based learning in nursing education
    M J Lewis
    School of Health Science, University of Wales Swansea, Swansea, UK
    Nurse Educ Today 21:26-37. 2001
    ..Because of this, the conclusions reached were not always valid. More effort is required in the design of future evaluation studies of nursing CBL packages...
  23. ncbi request reprint A review of evaluative studies of computer-based learning in nursing education. 2001
    Michael J Lewis
    Nurse Educ Today 25:586-97; discussion 598-600. 2005
  24. ncbi request reprint Patent ductus arteriosus as a natural cause of pulmonary hemorrhage in infants: a medicolegal dilemma
    Michael J Lewis
    Division of Forensic Pathology, University of Leicester, Leicester Royal Infirmary, Leicester, UK
    Am J Forensic Med Pathol 25:200-4. 2004
    ..These cases illustrate the medicolegal dilemma faced by the pathologist, as well as the need for further research into the potential association of PDA with MPH...