[{"data":1,"prerenderedAt":118},["ShallowReactive",2],{"knowledge-rer-en":3,"knowledge-list-en":80},{"_path":4,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":8,"description":9,"related":10,"references":14,"body":23,"_type":74,"_id":75,"_source":76,"_file":77,"_stem":78,"_extension":79},"\u002Fen\u002Fknowledge\u002Frer","knowledge",false,"","RER - Respiratory Exchange Ratio","The metabolic fingerprint that reveals your fuel mix.",[11,12,13],"vo2max","fatmax","metabolic-zones",[15,19],{"title":16,"url":17,"source":18},"Indirect calorimetry: methodology, instruments and clinical application","https:\u002F\u002Fpubmed.ncbi.nlm.nih.gov\u002F16779921\u002F","Ferrannini E, J Appl Physiol 1988",{"title":20,"url":21,"source":22},"Energy expenditure by indirect calorimetry in exercise","https:\u002F\u002Fpubmed.ncbi.nlm.nih.gov\u002F2691813\u002F","Weir JB, J Physiol 1949",{"type":24,"children":25,"toc":68},"root",[26,34,41,46,52,57,63],{"type":27,"tag":28,"props":29,"children":30},"element","p",{},[31],{"type":32,"value":33},"text","The Respiratory Exchange Ratio (RER) is the ratio of carbon dioxide produced to oxygen consumed (VCO2\u002FVO2) during exercise. It provides a window into which fuels the body is using and at what proportion, making it one of the most important metrics in metabolic testing.",{"type":27,"tag":35,"props":36,"children":38},"h2",{"id":37},"interpreting-rer-values",[39],{"type":32,"value":40},"Interpreting RER values",{"type":27,"tag":28,"props":42,"children":43},{},[44],{"type":32,"value":45},"An RER of 0.70 indicates nearly pure fat oxidation, while an RER of 1.00 indicates nearly pure carbohydrate oxidation. Values between 0.70 and 1.00 represent a mix of both fuels. At rest, a healthy individual typically has an RER of 0.80-0.85. During high-intensity exercise, RER can exceed 1.00 due to excess CO2 production from buffering of lactic acid (hyperventilation and bicarbonate buffering).",{"type":27,"tag":35,"props":47,"children":49},{"id":48},"rer-in-performance-testing",[50],{"type":32,"value":51},"RER in performance testing",{"type":27,"tag":28,"props":53,"children":54},{},[55],{"type":32,"value":56},"RER is critical for determining FatMax zones, ventilatory thresholds, and substrate utilization patterns. An RER consistently above 1.00 during a ramp test suggests the athlete is approaching VO2max and relying almost entirely on carbohydrate metabolism. The crossover point - where RER transitions from fat-dominant to carbohydrate-dominant metabolism - typically occurs around 0.85 and is an important training landmark.",{"type":27,"tag":35,"props":58,"children":60},{"id":59},"practical-considerations",[61],{"type":32,"value":62},"Practical considerations",{"type":27,"tag":28,"props":64,"children":65},{},[66],{"type":32,"value":67},"RER accuracy depends on steady-state conditions. Allow 2-3 minutes at each intensity stage for gas exchange to stabilize before interpreting values. Pre-test diet significantly affects RER: a high-carb meal before testing will shift baseline RER upward. For repeatable results, standardize nutrition 24 hours before testing. OpenSpiro displays RER in real-time and uses breath-by-breath averaging for smooth, reliable readings.",{"title":7,"searchDepth":69,"depth":69,"links":70},2,[71,72,73],{"id":37,"depth":69,"text":40},{"id":48,"depth":69,"text":51},{"id":59,"depth":69,"text":62},"markdown","content:en:knowledge:rer.md","content","en\u002Fknowledge\u002Frer.md","en\u002Fknowledge\u002Frer","md",[81,85,89,93,97,98,102,106,110,114],{"_path":82,"title":83,"description":84},"\u002Fen\u002Fknowledge\u002Fdiesel-vs-sprinter","Diesel vs. Sprinter — Two Athlete Types, One Test","Some athletes burn fat efficiently at high intensities. Others depend on carbs from the start. A metabolic test reveals which type you are — and how to train accordingly.",{"_path":86,"title":87,"description":88},"\u002Fen\u002Fknowledge\u002Ffatmax","FatMax - Maximum Fat Oxidation","Finding the intensity where your body burns the most fat.",{"_path":90,"title":91,"description":92},"\u002Fen\u002Fknowledge\u002Fmetabolic-zones","Metabolic Training Zones","From fat burning to VO2max - training with metabolic precision.",{"_path":94,"title":95,"description":96},"\u002Fen\u002Fknowledge\u002Fpower-meter","Power Meter Integration in Metabolic Testing","Why power data is essential for accurate metabolic analysis.",{"_path":4,"title":8,"description":9},{"_path":99,"title":100,"description":101},"\u002Fen\u002Fknowledge\u002Fslow-endurance","Why Slow Endurance Training Makes You Faster","The science behind long, slow distance training. Why 80% of your training should feel too easy - and how to find the right intensity.",{"_path":103,"title":104,"description":105},"\u002Fen\u002Fknowledge\u002Fspiroergometry","Best Practices for Spiroergometry","Where to get a spiroergometry test, what it costs, how to prepare, and how to do it yourself with portable equipment.",{"_path":107,"title":108,"description":109},"\u002Fen\u002Fknowledge\u002Ftraining-problems","Common Problems from Training in the Wrong Zones","Achilles tendon pain, chronic fatigue, stagnating performance - often caused by wrong training intensity.",{"_path":111,"title":112,"description":113},"\u002Fen\u002Fknowledge\u002Fvo2max","VO2max - Maximum Oxygen Uptake","The gold standard of cardiorespiratory fitness.",{"_path":115,"title":116,"description":117},"\u002Fen\u002Fknowledge\u002Fwhy-vo2-testing","Why VO2 Testing — What Your Watch Can't Tell You","Heart rate zones are guesses. VO2 testing shows what's actually happening inside your body. Here's why it matters for every endurance athlete.",1776594391333]