Research Committee

Marty Hoffman, MD


Dr. Marty Hoffman is former Professor of Physical Medicine & Rehabilitation at the University of California Davis (retired 2023), former Chief of Physical Medicine & Rehabilitation at the VA Northern California Health Care System (retired 2020), former Director of Research for the Western States Endurance Run (2006-16), former team physician for the US Biathlon Association (1988-95), and Chief Medical Officer for the Ultra Medical Team. He has published over 180 peer-reviewed publications mainly related to applied exercise physiology, focusing on human locomotion, human performance, and exercise-associated hyponatremia. His clinical work has involved cardiac rehabilitation, musculoskeletal medicine, and sports medicine. He has been a Fellow of the American College of Sports Medicine since 1989 and serves on multiple editorial boards. He has been a competitive cross-country skier or distance runner for most of his life and still enjoys exploring his limits… though at a much slower pace than in the past, and often with a fly rod in hand.

David Oxborough, PhD


Dr. David Oxborough is a Professor of Echocardiography and Cardiovascular Physiology at Liverpool John Moores University. He is co-chair of the Education Committee of the British Society of Echocardiography being lead author on professional guidelines for the use of echocardiography in the athlete whilst contributing to numerous others. He is also the Past-Chair of the Consortium for Accrediting Sonographic Education in the UK and acts as a lead accreditor for ultrasound education programs nationwide. As an academic and researcher, David has published over 130 peer-reviewed papers on echocardiography and its applications in Clinical and Exercise Cardiology. He has continuously worked in the imaging-based assessment of sudden cardiac death syndromes and pre-participation screening environment and has screened over 7000 athletes. He has continued to study the impact of endurance exercise on the heart and has traveled to endurance and ultra-endurance events across the globe to gain further insight into the acute cardiac effects of prolonged strenuous exercise and subsequent chronic adaptation. His work continues to explore this unique group of athletes aiming to answer the question as to whether too much exercise can be deleterious.

Guido Ferrari, MD

Dr. Guido Ferrari is Professor of Surgery and Associate Professor of Molecular Genetics and Microbiology at Duke University Medical Center. He has also been the Medical Director of Umstead 100 since 2013. His field of interest is immune responses against viral infection and vaccinology in healthy and immunocompromised individuals. He has published over 200 manuscripts covering HIV-1, CMV, TB, HCV, and SARS-CoV-2 infections and vaccines. He also loves exercise physiology. After years of skimo in the Alps, he started marathon running in 1991, when he moved to North Carolina, and ultra-distance running in 1994. He started his volunteering work in 2005 for Umstead 100 and has been working to give back to the running community since then.

Eric Goulet, PhD

Dr. Eric Goulet is a professor of exercise physiology at the Université de Sherbrooke, Canada, where he is also head of the performance, hydration and thermoregulation laboratory and director of the PhD program in Science of Physical Activity. His research interests include 1) the impact of dehydration, heat stress, ad libitum drinking and hyperhydration on physical performance, water balance and physiological functions; 2) the validation of devices or techniques aimed at measuring performance, core temperature or sodium concentration in sweat and; 3) the conduct of systematic reviews for improving our understanding of the impact of body water changes on physical performance. He is a member of the science advisory board of the Korey Stringer Institute and the Institut National du Sport du Québec. He earned his PhD in physiology from the Université de Sherbrooke and completed a 2-year postdoctoral fellowship in physiology at the McGill Nutrition and Food Science Center, McGill University, in Canada. He has published over 60 manuscripts in peer-reviewed journals, along with two book chapters. He has reviewed papers for more than 50 scientific journals. In his leisure time, he enjoys running, cycling and swimming and has completed over 50 long-distance triathlons.

James Jastifer, MD

Dr. James Jastifer is a board-certified orthopaedic surgeon and the Chief of Orthopaedic Surgery at Ascension Borgess Hospital in Kalamazoo, MI. He is also a biomedical engineer and has additional fellowship training in foot and ankle reconstruction which is the focus of a majority of his clinical practice. Dr. Jastifer is a Clinical Associate Professor at the Western Michigan University Homer Stryker M.D. School of Medicine and the Department of Mechanical and Aerospace Engineering at Western Michigan University. He has published numerous articles and textbook chapters and serves in several leadership positions, including the NFL’s Musculoskeletal Committee. Most importantly, he is an active ultramarathon runner with a passion for the science of ultra-endurance sports.

Rhiannon Snipe, PhD, APD, AdvSD

Dr. Rhiannon Snipe is an advanced sports dietitian and Lecturer in Sports Nutrition with the School of Exercise and Nutrition Sciences at Deakin University in Australia. Her PhD topic explored exertional heat stress induced gastrointestinal perturbations and nutrition related prevention strategies. Rhiannon’s current research interests include sports nutrition for female athletes with a specific focus on menstrual cycle and hormonal contraceptive effects on nutrition requirements, health and performance. She is a former competitive long-distance triathlete and an avid long-distance runner who aspires to improve her ultramarathon times, particularly over the 100km distance.

Christa Janse van Rensburg, DMed

Dr. Christa Janse van Rensburg is a Specialist in Physical Medicine and Rheumatology and a Sport and Exercise Medicine Professor at the University of Pretoria. She is a Founder Member of the newly established College of Sport and Exercise Medicine in South Africa. She is the past President of the South African Sports Medicine Association, a Fellow of the American College of Sports Medicine and a selected Member of the Scientific Committee of the International Olympic Committee (IOC) World Conference on Prevention of Injury and Illness in Sport (Monaco, 2021 and 2024). She is also a board member of the medical committee of World Netball, a member of FIFA’s Consensus Meeting on the methodology of injury and illness surveillance, and part of the International Tennis Federation’s Classification Science Advisory Group. She has published 128 peer-reviewed publications and 4 book chapters, with a 5th on its way. Her current research focus encompasses the effects of travel on athletes, the epidemiology of injuries and illness in different sporting disciplines such as trail running and netball, and the effect of exercise on patients suffering from arthritic diseases. She has reviewed more than 100 manuscripts and serves on multiple editorial boards. She delivered keynote addresses at several conferences and lectured for the Royal Society of Medicine. She accompanied many sports teams as a sports physician, both nationally and internationally. In her private capacity, she is an animal lover and an avid sports fan, both as a spectator and participant. She played national-level netball and completed the Comrades ultra-race and 10 Argus Cycle Tours.

We thank Kristin Stuempfle, PhD and Bob Weiss, MD for many years of service to the committee to 2023.