New Study Suggests Bonking Is Mostly a Brain Response to Low Blood Sugar
A comprehensive review published in Endocrine Reviews challenges the traditional understanding of 'bonking' in endurance sports. For decades, fatigue was attributed to muscle glycogen depletion. However, this new analysis of over 160 studies suggests that bonking is primarily caused by exercise-induced hypoglycemia, where falling blood glucose levels trigger the brain to reduce muscle recruitment as a protective mechanism. The research, conducted by teams from the Universities of Cape Town, Ohio State, Florida, and South Florida, indicates that the brain acts like a warning light, shutting down performance before serious damage occurs. Crucially, the study finds that athletes do not need massive carbohydrate intake to prevent this. Ingesting just 10 grams of carbohydrates per hour was shown to improve performance by 12 to 20 percent by stabilizing blood sugar levels. This finding contrasts with current trends of high-carb consumption in cycling. The implications suggest that maintaining stable blood glucose, rather than fully topping up muscle glycogen stores, is key to preventing fatigue during prolonged exercise, offering a more efficient nutritional strategy for endurance athletes.
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New Study Suggests Bonking Is Mostly a Brain Response to Low Blood Sugar
A comprehensive review published in Endocrine Reviews challenges the traditional understanding of 'bonking' in endurance sports. For decades, fatigue was attributed to muscle glycogen depletion. However, this new analysis of over 160 studies suggests that bonking is primarily caused by exercise-induced hypoglycemia, where falling blood glucose levels trigger the brain to reduce muscle recruitment as a protective mechanism. The research, conducted by teams from the Universities of Cape Town, Ohio State, Florida, and South Florida, indicates that the brain acts like a warning light, shutting down performance before serious damage occurs. Crucially, the study finds that athletes do not need massive carbohydrate intake to prevent this. Ingesting just 10 grams of carbohydrates per hour was shown to improve performance by 12 to 20 percent by stabilizing blood sugar levels. This finding contrasts with current trends of high-carb consumption in cycling. The implications suggest that maintaining stable blood glucose, rather than fully topping up muscle glycogen stores, is key to preventing fatigue during prolonged exercise, offering a more efficient nutritional strategy for endurance athletes.
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