How does exercise affect metabolism after eating with Dr Javier Gonzalez
Dr Glenn McConell chats with Professor Javier Gonzalez from the University of Bath. We discuss carbohydrate (CHO) metabolism at rest when fasted vs fed, during exercise when fasted vs fed and the effects of exercise on metabolism after a meal. We also discuss muscle and liver glycogen resynthesis and the effects of different types and amounts of carbohydrate. Finally, we touch on Javier’s study with ketone supplementation and EPO. 0:00. Introduction 2:23. How got into exercise research 4:43. Metabolism at rest when fasted and in response to a meal 7:30. Effect of exercise on metabolism after a meal 9:15. Transient hypoglycemia during exercise after a meal (in some) 10:04. Effect of increasing amounts of glucose on blood glucose levels 12:21. Tracer studies to determine glucose turnover/flux The glucose concentration does not tell us the rate of glucose appearance and disappearance. Need tracer methodologies to determine this. 18:06. Maximum rate of CHO can ingest during exercise Glucose vs fructose etc. 20:55. Glycogen resynthesis after exercise 23:00. Indirect pathway of glucose metabolism in the liver 24:49. If exercising once per day generally don’t need to maximize glycogen levels 29:23. Glucose, fructose vs normal food/meals 31:17. Generally don’t need CHO loading or CHO ingestion if exercise is ~1hr 33:24. CHO backloading 35:52. Glucose spikes after eating are generally normal physiology After a meal it is normal to have a “spike” (excursion) in glucose concentrations. 38:45. Research studies using fasted vs fed individuals 40:38. Time to exhaustion vs time trials 43:34. CHO ingestion reduces liver glycogen use Is there a sensor from the liver to the brain that effects exercise performance? 46:28. Fasting, exercise intensity and CHO needs 49:03. Ingesting CHO and lactate measurements 50:50. Continuous glucose monitors 53:40. Often doesn’t find what he expected to in research 55:08. What’s he excited about right now? 58:35. Liver glycogenolysis vs gluconeogenesis during exercise 59:59. High exercise intensity and CHO metabolism 1:01:47. Different ways of measuring insulin sensitivity The so-called gold standard to determine insulin sensitivity is the euglycemic hyperinsulinemic clamp but it’s so different to eating meals. 1:04:58. Ketones, exercise and EPO 1:07:32. Endurance athletes generally benefit from high CHO diets 1:09:04. Take home messages 1:12:08. Outro (9 seconds) Inside Exercise brings to you the who's who of exercise metabolism, exercise physiology and exercise’s effects on health. With scientific rigor, these researchers discuss popular exercise topics while providing practical strategies for all. The interviewer, Emeritus Professor Glenn McConell, has an international research profile following 30 years of Exercise Metabolism research experience while at The University of Melbourne, Ball State University, Monash University, the University of Copenhagen and Victoria University. He has published over 120 peer reviewed journal articles and recently edited an Exercise Metabolism eBook written by world experts on 17 different topics (https://link.springer.com/book/10.1007/978-3-030-94305-9). Connect with Inside Exercise and Glenn McConell at: Twitter: @Inside_exercise and @GlennMcConell1 Instagram: insideexercise Facebook: Glenn McConell LinkedIn: Glenn McConell https://www.linkedin.com/in/glenn-mcconell-83475460 ResearchGate: Glenn McConell ' Email: [email protected] Subscribe to Inside exercise: Spotify Apple Podcasts YouTube Google Podcasts Anchor Podcast Addict