[{"data":1,"prerenderedAt":419},["ShallowReactive",2],{"knowledge-diesel-vs-sprinter-en":3,"knowledge-list-en":381},{"_path":4,"_dir":5,"_draft":6,"_partial":6,"_locale":7,"title":8,"description":9,"related":10,"references":15,"body":28,"_type":375,"_id":376,"_source":377,"_file":378,"_stem":379,"_extension":380},"\u002Fen\u002Fknowledge\u002Fdiesel-vs-sprinter","knowledge",false,"","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.",[11,12,13,14],"fatmax","why-vo2-testing","metabolic-zones","slow-endurance",[16,20,24],{"title":17,"url":18,"source":19},"Determinants of Maximal Fat Oxidation During Exercise","https:\u002F\u002Fwww.frontiersin.org\u002Fjournals\u002Fphysiology\u002Farticles\u002F10.3389\u002Ffphys.2018.00599\u002Ffull","Randell et al., Front Physiol 2018",{"title":21,"url":22,"source":23},"Fat oxidation rates across a range of exercise intensities","https:\u002F\u002Fpubmed.ncbi.nlm.nih.gov\u002F15831061\u002F","Venables et al., Med Sci Sports Exerc 2005",{"title":25,"url":26,"source":27},"Skeletal muscle fiber type: influence on contractile and metabolic properties","https:\u002F\u002Fpubmed.ncbi.nlm.nih.gov\u002F8775717\u002F","Pette & Staron, J Appl Physiol 1996",{"type":29,"children":30,"toc":367},"root",[31,39,46,81,92,98,131,140,146,151,194,206,212,308,314,319,362],{"type":32,"tag":33,"props":34,"children":35},"element","p",{},[36],{"type":37,"value":38},"text","Not every athlete responds to the same training. Some are natural fat burners — efficient, steady, built for hours. Others run hot on carbs — explosive, powerful, but limited by glycogen. Most people don't know which type they are. A single metabolic test tells you.",{"type":32,"tag":40,"props":41,"children":43},"h2",{"id":42},"the-diesel",[44],{"type":37,"value":45},"The Diesel",{"type":32,"tag":47,"props":48,"children":49},"ul",{},[50,56,61,66,71,76],{"type":32,"tag":51,"props":52,"children":53},"li",{},[54],{"type":37,"value":55},"FatMax at 65-75% of VO2max — burns fat even at solid intensity",{"type":32,"tag":51,"props":57,"children":58},{},[59],{"type":37,"value":60},"RER stays below 0.85 deep into Zone 2",{"type":32,"tag":51,"props":62,"children":63},{},[64],{"type":37,"value":65},"Can ride or run for hours without fueling",{"type":32,"tag":51,"props":67,"children":68},{},[69],{"type":37,"value":70},"Crossover point (where carbs take over) happens late",{"type":32,"tag":51,"props":72,"children":73},{},[74],{"type":37,"value":75},"Naturally suited for: Ironman, ultra-running, gravel, bikepacking, long fondos",{"type":32,"tag":51,"props":77,"children":78},{},[79],{"type":37,"value":80},"Risk: neglects top-end speed, avoids intensity, plateaus at threshold",{"type":32,"tag":33,"props":82,"children":83},{},[84,90],{"type":32,"tag":85,"props":86,"children":87},"strong",{},[88],{"type":37,"value":89},"What this looks like in a test:",{"type":37,"value":91}," RER rises slowly and linearly. Fat oxidation stays high well into the ramp. VT1 is relatively high. The athlete can talk at intensities that would silence others.",{"type":32,"tag":40,"props":93,"children":95},{"id":94},"the-sprinter",[96],{"type":37,"value":97},"The Sprinter",{"type":32,"tag":47,"props":99,"children":100},{},[101,106,111,116,121,126],{"type":32,"tag":51,"props":102,"children":103},{},[104],{"type":37,"value":105},"FatMax at 35-50% of VO2max — shifts to carbs early",{"type":32,"tag":51,"props":107,"children":108},{},[109],{"type":37,"value":110},"RER jumps above 0.90 at moderate intensity",{"type":32,"tag":51,"props":112,"children":113},{},[114],{"type":37,"value":115},"Depends on glycogen from the first interval",{"type":32,"tag":51,"props":117,"children":118},{},[119],{"type":37,"value":120},"High power output but bonks in long events without careful fueling",{"type":32,"tag":51,"props":122,"children":123},{},[124],{"type":37,"value":125},"Naturally suited for: crits, short TTs, Hyrox, CrossFit, track",{"type":32,"tag":51,"props":127,"children":128},{},[129],{"type":37,"value":130},"Risk: poor endurance base, chronic glycogen depletion, weight issues",{"type":32,"tag":33,"props":132,"children":133},{},[134,138],{"type":32,"tag":85,"props":135,"children":136},{},[137],{"type":37,"value":89},{"type":37,"value":139}," RER rises steeply. Fat oxidation peaks early and drops fast. The athlete produces high watts but crosses RER 1.0 quickly.",{"type":32,"tag":40,"props":141,"children":143},{"id":142},"most-athletes-are-somewhere-in-between",[144],{"type":37,"value":145},"Most athletes are somewhere in between",{"type":32,"tag":33,"props":147,"children":148},{},[149],{"type":37,"value":150},"The Diesel\u002FSprinter model is a spectrum, not a binary. Your position on it is determined by:",{"type":32,"tag":47,"props":152,"children":153},{},[154,164,174,184],{"type":32,"tag":51,"props":155,"children":156},{},[157,162],{"type":32,"tag":85,"props":158,"children":159},{},[160],{"type":37,"value":161},"Genetics",{"type":37,"value":163}," — muscle fiber composition (Type I vs Type II dominance)",{"type":32,"tag":51,"props":165,"children":166},{},[167,172],{"type":32,"tag":85,"props":168,"children":169},{},[170],{"type":37,"value":171},"Training history",{"type":37,"value":173}," — years of aerobic base vs intensity focus",{"type":32,"tag":51,"props":175,"children":176},{},[177,182],{"type":32,"tag":85,"props":178,"children":179},{},[180],{"type":37,"value":181},"Diet",{"type":37,"value":183}," — high-carb vs fat-adapted",{"type":32,"tag":51,"props":185,"children":186},{},[187,192],{"type":32,"tag":85,"props":188,"children":189},{},[190],{"type":37,"value":191},"Current training phase",{"type":37,"value":193}," — base period vs race season",{"type":32,"tag":33,"props":195,"children":196},{},[197,199,204],{"type":37,"value":198},"The key insight: ",{"type":32,"tag":85,"props":200,"children":201},{},[202],{"type":37,"value":203},"your position on this spectrum is trainable.",{"type":37,"value":205}," A Sprinter can develop their fat metabolism through targeted Zone 2 work. A Diesel can build top-end power through structured intensity. But you need to know where you start.",{"type":32,"tag":40,"props":207,"children":209},{"id":208},"why-this-changes-your-training",[210],{"type":37,"value":211},"Why this changes your training",{"type":32,"tag":213,"props":214,"children":215},"table",{},[216,240],{"type":32,"tag":217,"props":218,"children":219},"thead",{},[220],{"type":32,"tag":221,"props":222,"children":223},"tr",{},[224,230,235],{"type":32,"tag":225,"props":226,"children":227},"th",{},[228],{"type":37,"value":229},"If you're a...",{"type":32,"tag":225,"props":231,"children":232},{},[233],{"type":37,"value":234},"Your priority",{"type":32,"tag":225,"props":236,"children":237},{},[238],{"type":37,"value":239},"Your risk",{"type":32,"tag":241,"props":242,"children":243},"tbody",{},[244,266,287],{"type":32,"tag":221,"props":245,"children":246},{},[247,256,261],{"type":32,"tag":248,"props":249,"children":250},"td",{},[251],{"type":32,"tag":85,"props":252,"children":253},{},[254],{"type":37,"value":255},"Diesel",{"type":32,"tag":248,"props":257,"children":258},{},[259],{"type":37,"value":260},"Add intensity. VO2max intervals, threshold work, race-pace sessions. Your engine is big — now add the turbo.",{"type":32,"tag":248,"props":262,"children":263},{},[264],{"type":37,"value":265},"Getting stuck in \"forever Zone 2\". Comfortable but not improving.",{"type":32,"tag":221,"props":267,"children":268},{},[269,277,282],{"type":32,"tag":248,"props":270,"children":271},{},[272],{"type":32,"tag":85,"props":273,"children":274},{},[275],{"type":37,"value":276},"Sprinter",{"type":32,"tag":248,"props":278,"children":279},{},[280],{"type":37,"value":281},"Build the base. More volume below VT1, longer rides, patience. Your turbo is there — build the engine under it.",{"type":32,"tag":248,"props":283,"children":284},{},[285],{"type":37,"value":286},"Overtraining, glycogen depletion, injury from too much intensity.",{"type":32,"tag":221,"props":288,"children":289},{},[290,298,303],{"type":32,"tag":248,"props":291,"children":292},{},[293],{"type":32,"tag":85,"props":294,"children":295},{},[296],{"type":37,"value":297},"In between",{"type":32,"tag":248,"props":299,"children":300},{},[301],{"type":37,"value":302},"Polarize. 80% below VT1, 20% above VT2. Avoid the gray zone.",{"type":32,"tag":248,"props":304,"children":305},{},[306],{"type":37,"value":307},"Spending all training time at moderate intensity — too hard to recover, too easy to improve.",{"type":32,"tag":40,"props":309,"children":311},{"id":310},"how-to-find-out-which-type-you-are",[312],{"type":37,"value":313},"How to find out which type you are",{"type":32,"tag":33,"props":315,"children":316},{},[317],{"type":37,"value":318},"A FatMax test (graded exercise test) reveals your metabolic profile:",{"type":32,"tag":47,"props":320,"children":321},{},[322,332,342,352],{"type":32,"tag":51,"props":323,"children":324},{},[325,330],{"type":32,"tag":85,"props":326,"children":327},{},[328],{"type":37,"value":329},"Where your fat oxidation peaks",{"type":37,"value":331}," — this is your FatMax zone",{"type":32,"tag":51,"props":333,"children":334},{},[335,340],{"type":32,"tag":85,"props":336,"children":337},{},[338],{"type":37,"value":339},"How quickly RER rises",{"type":37,"value":341}," — steep = Sprinter, gradual = Diesel",{"type":32,"tag":51,"props":343,"children":344},{},[345,350],{"type":32,"tag":85,"props":346,"children":347},{},[348],{"type":37,"value":349},"Where the crossover point is",{"type":37,"value":351}," — when carbs take over from fat",{"type":32,"tag":51,"props":353,"children":354},{},[355,360],{"type":32,"tag":85,"props":356,"children":357},{},[358],{"type":37,"value":359},"Your absolute fat oxidation rate",{"type":37,"value":361}," — grams of fat per minute at peak",{"type":32,"tag":33,"props":363,"children":364},{},[365],{"type":37,"value":366},"OpenSpiro runs a guided FatMax protocol and shows all of this in real time. One test, 30 minutes, and you know exactly which type you are — and what to do about it.",{"title":7,"searchDepth":368,"depth":368,"links":369},2,[370,371,372,373,374],{"id":42,"depth":368,"text":45},{"id":94,"depth":368,"text":97},{"id":142,"depth":368,"text":145},{"id":208,"depth":368,"text":211},{"id":310,"depth":368,"text":313},"markdown","content:en:knowledge:diesel-vs-sprinter.md","content","en\u002Fknowledge\u002Fdiesel-vs-sprinter.md","en\u002Fknowledge\u002Fdiesel-vs-sprinter","md",[382,383,387,391,395,399,403,407,411,415],{"_path":4,"title":8,"description":9},{"_path":384,"title":385,"description":386},"\u002Fen\u002Fknowledge\u002Ffatmax","FatMax - Maximum Fat Oxidation","Finding the intensity where your body burns the most fat.",{"_path":388,"title":389,"description":390},"\u002Fen\u002Fknowledge\u002Fmetabolic-zones","Metabolic Training Zones","From fat burning to VO2max - training with metabolic precision.",{"_path":392,"title":393,"description":394},"\u002Fen\u002Fknowledge\u002Fpower-meter","Power Meter Integration in Metabolic Testing","Why power data is essential for accurate metabolic analysis.",{"_path":396,"title":397,"description":398},"\u002Fen\u002Fknowledge\u002Frer","RER - Respiratory Exchange Ratio","The metabolic fingerprint that reveals your fuel mix.",{"_path":400,"title":401,"description":402},"\u002Fen\u002Fknowledge\u002Fslow-endurance","Why Slow Endurance Training Makes You Faster","The science behind long, slow distance training. 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Here's why it matters for every endurance athlete.",1776594391333]