[{"data":1,"prerenderedAt":607},["ShallowReactive",2],{"lexique-en-type-ii-muscle-fibers":3,"lexique-all-en":248,"lexique-trans-en-type-ii-muscle-fibers":602},{"id":4,"title":5,"body":6,"description":238,"extension":239,"lang":240,"letter":241,"meta":242,"navigation":243,"path":244,"ref":12,"seo":245,"stem":246,"__hash__":247},"lexique/lexique/en/type-ii-muscle-fibers.md","Type II muscle fibers",{"type":7,"value":8,"toc":228},"minimark",[9,13,18,30,33,36,39,44,98,101,103,107,148,150,154,186,188,191,193,197,211,213,217],[10,11,5],"h1",{"id":12},"type-ii-muscle-fibers",[14,15,17],"h4",{"id":16},"definition","Definition",[19,20,21,25,26,29],"p",{},[22,23,24],"strong",{},"Type II fibers"," (or fast-twitch / \"white\" fibers) are ",[22,27,28],{},"muscle fibers optimized for high-intensity, short-duration efforts",". They contract quickly and powerfully, but fatigue rapidly.",[31,32],"blockquote",{},[19,34,35],{},"💡 The triceps, biceps, quadriceps and gastrocnemius are typically rich in type II fibers. The opposite of type I fibers (slow, endurance-oriented).",[37,38],"hr",{},[40,41,43],"h3",{"id":42},"the-2-subtypes-of-type-ii","The 2 subtypes of Type II",[45,46,47,66],"table",{},[48,49,50],"thead",{},[51,52,53,57,60,63],"tr",{},[54,55,56],"th",{},"Subtype",[54,58,59],{},"Speed",[54,61,62],{},"Endurance",[54,64,65],{},"Profile",[67,68,69,84],"tbody",{},[51,70,71,75,78,81],{},[72,73,74],"td",{},"Type IIa",[72,76,77],{},"Fast",[72,79,80],{},"Moderate",[72,82,83],{},"Hybrid (force + some endurance)",[51,85,86,89,92,95],{},[72,87,88],{},"Type IIb (or IIx)",[72,90,91],{},"Very fast",[72,93,94],{},"Very low",[72,96,97],{},"Pure power, explosive",[19,99,100],{},"Type IIb fibers are the most powerful, but also the fastest to fatigue.",[37,102],{},[40,104,106],{"id":105},"characteristics-of-type-ii","Characteristics of Type II",[108,109,110,118,124,130,136,142],"ul",{},[111,112,113,114,117],"li",{},"✅ ",[22,115,116],{},"Force production",": very high",[111,119,113,120,123],{},[22,121,122],{},"Contraction speed",": fast to very fast",[111,125,113,126,129],{},[22,127,128],{},"Hypertrophy potential",": high (visible muscle gains)",[111,131,132,133,135],{},"❌ ",[22,134,62],{},": low",[111,137,132,138,141],{},[22,139,140],{},"Mitochondria",": few",[111,143,132,144,147],{},[22,145,146],{},"Energy source",": anaerobic (ATP-PC, glycolysis)",[37,149],{},[40,151,153],{"id":152},"how-to-develop-type-ii","How to develop Type II",[108,155,156,162,168,174,180],{},[111,157,113,158,161],{},[22,159,160],{},"Heavy reps",": 1-8 reps at 70-90% 1RM",[111,163,113,164,167],{},[22,165,166],{},"Long rest",": 3-5 minutes",[111,169,113,170,173],{},[22,171,172],{},"Explosive movements",": power cleans, jumps, plyometrics",[111,175,113,176,179],{},[22,177,178],{},"Sprints",": 20-100 m at maximum effort",[111,181,113,182,185],{},[22,183,184],{},"Maximum movement speed",": even with moderate loads, push intent",[31,187],{},[19,189,190],{},"⚠️ Type II fibers atrophy faster with age and inactivity than type I. Maintaining them requires regular stimulation.",[37,192],{},[40,194,196],{"id":195},"common-mistakes","Common mistakes",[108,198,199,202,205,208],{},[111,200,201],{},"❌ Always training at high reps (15+) → ignores type II",[111,203,204],{},"❌ Slow movements without explosive intent",[111,206,207],{},"❌ Cardio-only without resistance training (atrophy of type II)",[111,209,210],{},"❌ Skipping plyometrics and sprints",[37,212],{},[40,214,216],{"id":215},"key-takeaways","Key takeaways",[19,218,219,220,223,224,227],{},"Type II fibers are ",[22,221,222],{},"your engine for strength, power and visible hypertrophy",". Train them with heavy loads, low reps, explosive intent. ",[22,225,226],{},"Develop them young, maintain them with age"," — they're the first to disappear with sedentarism.",{"title":229,"searchDepth":230,"depth":230,"links":231},"",2,[232,234,235,236,237],{"id":42,"depth":233,"text":43},3,{"id":105,"depth":233,"text":106},{"id":152,"depth":233,"text":153},{"id":195,"depth":233,"text":196},{"id":215,"depth":233,"text":216},"Type II fibers (fast-twitch) are powerful muscle fibers optimized for explosive efforts. Essential for strength and power.","md","en","T",{},true,"/lexique/en/type-ii-muscle-fibers",{"title":5,"description":238},"lexique/en/type-ii-muscle-fibers","rBhCeRIy4uZJsf4NZKJUyNnEBgY0eiYg3HaZ6k1t20w",[249,253,257,261,265,269,273,277,281,285,289,293,297,301,305,309,313,317,321,325,329,333,337,341,345,349,353,357,361,365,369,373,377,381,385,389,393,397,401,405,409,413,417,421,425,429,433,437,441,445,449,453,457,461,465,469,473,477,481,485,489,493,497,501,505,509,513,517,521,525,529,533,537,541,545,549,553,557,561,565,569,573,577,581,585,589,593,594,598],{"title":250,"description":251,"slug":252},"AMRAP - As Many Reps/Rounds As Possible","AMRAP is a high-intensity training format: do as many reps or rounds as possible in a fixed time. CrossFit favorite.","amrap-as-many-reps-rounds-as-possible",{"title":254,"description":255,"slug":256},"ATP (Adenosine Triphosphate)","ATP is the universal energy currency of the body. Every muscle contraction, every cellular function depends on it.","atp-adenosine-triphosphate",{"title":258,"description":259,"slug":260},"Abduction","Discover what abduction is in bodybuilding, this movement which moves a limb away from the central axis of the body to develop the stabilizing muscles.","abduction",{"title":262,"description":263,"slug":264},"Active recovery","Active recovery uses light activity to speed muscle recovery. Find out how to effectively integrate it into your routine.","active-recovery",{"title":266,"description":267,"slug":268},"Adduction","Adduction is a movement that brings a body part toward the body's midline. Opposite of abduction.","adduction",{"title":270,"description":271,"slug":272},"Aerobic System","The aerobic system produces energy with oxygen, fueling long-duration efforts. It's the foundation of endurance and recovery.","aerobic-system",{"title":274,"description":275,"slug":276},"Anabolic window","The anabolic window is the post-workout period considered ideal for nutrition. The reality: it's much longer than thought.","anabolic-window",{"title":278,"description":279,"slug":280},"Anaerobic System","The anaerobic system produces energy without oxygen — for explosive, intense efforts. Limited but powerful, it fuels strength and sprints.","anaerobic-system",{"title":282,"description":283,"slug":284},"BCAA","BCAAs are 3 essential branched-chain amino acids: leucine, isoleucine, valine. Discover their real usefulness, timing, and whether you actually need them.","bcaa",{"title":286,"description":287,"slug":288},"BMI","BMI (Body Mass Index) is a quick health screening tool, but it doesn't account for body composition. Limited but useful.","bmi-body-mass-index",{"title":290,"description":291,"slug":292},"BMR","BMR (Basal Metabolic Rate) is your resting metabolism — the calories burned just to stay alive. Learn how to calculate and optimize it for your fitness goals.","bmr",{"title":294,"description":295,"slug":296},"Body fat percentage","Body fat percentage measures the share of fat in your total body mass. A key indicator of body composition.","body-fat-percentage",{"title":298,"description":299,"slug":300},"Body recomposition","Body recomposition is gaining muscle and losing fat at the same time. Possible but slow — discover the conditions for success.","body-recomposition",{"title":302,"description":303,"slug":304},"Bodyweight","Bodyweight training uses your own body as resistance. No equipment, anywhere, scalable to any level.","bodyweight",{"title":306,"description":307,"slug":308},"Calorie Maintenance","Caloric maintenance is the calorie level keeping your weight stable. Foundation of any nutritional plan.","calorie-maintenance",{"title":310,"description":311,"slug":312},"Calorie Surplus","A caloric surplus means consuming more calories than you burn. Mandatory mechanism for serious muscle building.","calorie-surplus",{"title":314,"description":315,"slug":316},"Calorie deficit","A caloric deficit means consuming fewer calories than you burn. It's the only proven mechanism for fat loss. Learn how to set yours up properly.","calorie-deficit",{"title":318,"description":319,"slug":320},"Calories","Calories measure the energy provided by food. Understanding your caloric needs is the foundation of every fitness goal.","calories",{"title":322,"description":323,"slug":324},"Carbohydrates","Carbohydrates are the main source of energy for intense training. Discover your needs, the different types and their role in performance.","carbohydrates",{"title":326,"description":327,"slug":328},"Circuit training","Circuit training chains several exercises with little rest. Ideal for burning calories and improving cardiovascular fitness while keeping muscle.","circuit-training",{"title":330,"description":331,"slug":332},"Concentric (Phase)","The concentric phase is the lifting movement, where the muscle shortens under load. It's the active phase that produces force.","concentric-phase",{"title":334,"description":335,"slug":336},"Creatine","Creatine is the most studied supplement in sports nutrition, proven to boost strength, power and muscle mass. Learn dosage, timing and real benefits.","creatine",{"title":338,"description":339,"slug":340},"Cutting","A cutting phase is a period of caloric deficit aimed at losing fat while preserving muscle. Discover how to do it without losing your hard-earned gains.","dried",{"title":342,"description":343,"slug":344},"DOMS (Delayed Onset Muscle Soreness)","DOMS is the muscle soreness that appears 24-72h after exercise. Discover its causes, how to manage it, and what it really means for your progress.","doms-delayed-onset-muscle-soreness",{"title":346,"description":347,"slug":348},"Deload","Deload is an active recovery week where you intentionally reduce volume and intensity to allow your body to fully recover and come back stronger.","deload",{"title":350,"description":351,"slug":352},"Dropset","A dropset extends a set by reducing the load when failure hits. Powerful intensification method for hypertrophy.","dropset",{"title":354,"description":355,"slug":356},"EMOM - Every Minute On the Minute","EMOM (Every Minute On the Minute) is a training format where you start a set at the top of each minute and rest until the next.","emom-every-minute-on-the-minute",{"title":358,"description":359,"slug":360},"Eccentric (Phase)","The eccentric phase is the lowering movement, where the muscle lengthens under tension. It's the most damaging phase and the key driver of hypertrophy.","eccentric-phase",{"title":362,"description":363,"slug":364},"Extension","Extension is the anatomical movement that increases the angle between two body segments. Opposite of flexion.","extension",{"title":366,"description":367,"slug":368},"Fat mass","Fat mass is the total weight of fat tissue. Essential for survival, but excess harms health and aesthetics.","fat-mass",{"title":370,"description":371,"slug":372},"Fibers","Muscle fibers are the cells that make up muscle. Two main types — Type I (slow) and Type II (fast) — define your physical potential.","fibers",{"title":374,"description":375,"slug":376},"Flexion","Flexion is the anatomical movement that decreases the angle between two body segments. Opposite of extension.","flexion",{"title":378,"description":379,"slug":380},"Foam rolling","Foam rolling is a myofascial self-massage technique to release muscle tension. Find out how to use it effectively to improve recovery and mobility.","foam-rolling",{"title":382,"description":383,"slug":384},"For Time","For Time is a training format where you complete a fixed amount of work as fast as possible. Race against the clock.","for-time",{"title":386,"description":387,"slug":388},"Full Body","A full body program trains all major muscle groups in each session, 2-4 times per week. Ideal for beginners and strength training.","full-body",{"title":390,"description":391,"slug":392},"Hypertrophy","Muscle hypertrophy is the increase in muscle fiber size. It's the primary mechanism behind muscle growth from resistance training.","hypertrophy",{"title":394,"description":395,"slug":396},"Hypertrophy Training","Hypertrophy training aims to maximize muscle growth using moderate loads (65-85% 1RM) with 8-15 repetitions per set.","hypertrophy-training",{"title":398,"description":399,"slug":400},"Intra-workout","Intra-workout refers to nutrition consumed during training to maintain energy, hydration and performance on long sessions.","intra-workout",{"title":402,"description":403,"slug":404},"Isometric","Isometric contraction is when the muscle produces tension without changing length. No visible movement, intense work.","isometric-contraction",{"title":406,"description":407,"slug":408},"Lean mass","Lean mass is everything in your body except fat: muscles, bones, organs, water. A real performance indicator.","lean-mass",{"title":410,"description":411,"slug":412},"Lipids (Fats)","Lipids are essential for hormone production and vitamin absorption. Discover your needs, the right sources and their role in bodybuilding.","lipids-fats",{"title":414,"description":415,"slug":416},"Macrocycle","A macrocycle is the global organization of your training over 3-12 months. The highest level of periodization, your annual game plan.","macrocycle",{"title":418,"description":419,"slug":420},"Macronutrients (Macros)","Macronutrients are the 3 main types of nutrients: proteins, carbohydrates and lipids. Their balance is crucial for performance and body composition.","macronutrients-macros",{"title":422,"description":423,"slug":424},"Maintenance","Maintenance is the calorie level at which your weight remains stable. The neutral baseline for any nutritional strategy.","maintenance",{"title":426,"description":427,"slug":428},"Mass gain","Mass gain (or bulk) is a controlled caloric surplus phase aimed at building muscle. Discover how to do it without gaining excess fat.","mass-gain",{"title":430,"description":431,"slug":432},"Meal timing","Meal timing is the strategic distribution of your meals around training and through the day to optimize performance and recovery.","meal-timing",{"title":434,"description":435,"slug":436},"Mesocycle","A mesocycle is a 4-8 week training block with a specific objective (hypertrophy, strength, peak, deload). The cornerstone of periodization.","mesocycle",{"title":438,"description":439,"slug":440},"Microcycle","A microcycle is the smallest planning unit in bodybuilding: generally 1 week of training. This is your weekly routine.","microcycle",{"title":442,"description":443,"slug":444},"Mobility","Mobility is the ability to actively control range of motion. Find out how to improve your mobility to optimize your performance.","mobility",{"title":446,"description":447,"slug":448},"Muscle mass","Muscle mass is the total weight of muscles in the body. Key indicator of strength, metabolism, and longevity.","muscle-mass",{"title":450,"description":451,"slug":452},"Muscular Endurance Training","Muscular endurance training develops the ability to sustain prolonged effort. Light loads, high reps, short rests.","muscular-endurance-training",{"title":454,"description":455,"slug":456},"Muscular endurance","Muscular endurance is a muscle's capacity to sustain repeated or prolonged contractions without excessive fatigue. Foundation of many sports.","muscular-endurance",{"title":458,"description":459,"slug":460},"Muscular strength","Muscular strength is the maximum force a muscle (or group) can produce. The fundamental physical quality of any athlete.","muscular-strength",{"title":462,"description":463,"slug":464},"NEAT","NEAT is the energy you burn through all your daily activities outside of training. The most underestimated lever of your body composition.","neat",{"title":466,"description":467,"slug":468},"PR - Personal Record","A PR (Personal Record) is your best performance ever on a movement. The fundamental progress marker.","pr-personal-record",{"title":470,"description":471,"slug":472},"Passive recovery","Passive recovery links on complete rest to allow the body to regenerate. Find out when and how to use it effectively.","passive-recovery",{"title":474,"description":475,"slug":476},"Periodization","Periodization is the cyclical organization of training into distinct phases to optimize progression, prevent plateaus, and avoid injuries.","periodization",{"title":478,"description":479,"slug":480},"Plateau","A plateau is a period of stagnation despite consistent training. Identifying the cause is the key to breaking it.","plateau",{"title":482,"description":483,"slug":484},"Post-workout","The post-workout is the nutrition right after training to optimize recovery and growth. Protein, carbs, hydration.","post-workout",{"title":486,"description":487,"slug":488},"Pre-workout","The pre-workout is the meal or supplement taken before training to optimize performance. Energy, focus, and pump.","pre-workout",{"title":490,"description":491,"slug":492},"Progressive overload","Progressive overload is the foundational principle of training: gradually increasing the demand on your muscles to keep gaining strength and size.","progressive-overload",{"title":494,"description":495,"slug":496},"Protein","Protein is the essential macronutrient for building and repairing muscle. Discover your needs, the best sources and the optimal timing.","protein",{"title":498,"description":499,"slug":500},"Protein powder","Protein powders are concentrated protein supplements. Practical for hitting daily protein needs.","protein-powder",{"title":502,"description":503,"slug":504},"Push/Pull/Legs (PPL)","The Push/Pull/Legs program divides the workout into 3 types of sessions: push (chests/shoulders/triceps), pull (back/biceps) and legs. Optimal for all levels with frequency 2x/week per muscle.","push-pull-legs-ppl",{"title":506,"description":507,"slug":508},"RIR","RIR (Reps in Reserve) measures how many reps you have left before failure. Modern, intuitive tool to manage intensity.","rir-reps-in-reserve",{"title":510,"description":511,"slug":512},"RPE","RPE (Rate of Perceived Exertion) is a 1-10 scale to measure subjective effort. Essential tool for managing intensity.","rpe-rate-of-perceived-exertion",{"title":514,"description":515,"slug":516},"Range of motion (ROM)","Range of motion (ROM) is the amplitude through which a joint or muscle can move during an exercise. Crucial for hypertrophy and joint health.","range-of-motion-rom",{"title":518,"description":519,"slug":520},"Repetitions (Reps)","A rep is one complete execution of an exercise. The rep range determines whether you primarily develop strength, hypertrophy, or muscular endurance.","repetitions-reps",{"title":522,"description":523,"slug":524},"Rest","Rest between sets is critical and depends on the goal. Strength: 3-5 min. Hypertrophy: 1-3 min. Endurance: 30-60 sec.","rest",{"title":526,"description":527,"slug":528},"Rest-Pause","Rest-pause is an intensification method using ultra-short pauses to extend a set. Powerful tool for hypertrophy.","rest-pause",{"title":530,"description":531,"slug":532},"Sarcomere","The sarcomere is the basic contractile unit of muscle. Composed of actin and myosin, it produces all your movements.","sarcomere",{"title":534,"description":535,"slug":536},"Series (Sets)","A series (or set) is a group of consecutive reps without rest. The basic unit of training programming.","series-sets",{"title":538,"description":539,"slug":540},"Sleep","Sleep is the most underrated training variable. It's during sleep that recovery, muscle building, and hormonal regulation happen.","sleep",{"title":542,"description":543,"slug":544},"Split (Split program)","A split workout involves dividing muscle groups over different days. The classic split trains each muscle once a week for 5-6 days.","split-split-program",{"title":546,"description":547,"slug":548},"Strength Training","Strength training aims to develop maximal strength using heavy loads (80-95% of 1RM) with few repetitions (1-6 reps).","strength-training",{"title":550,"description":551,"slug":552},"Stretching","Stretching improves flexibility and range of motion. Learn about the different types and how to effectively incorporate them into your routine.","stretching",{"title":554,"description":555,"slug":556},"Superset","A superset chains two exercises with no rest between them. Time-efficient method that boosts intensity and density.","superset",{"title":558,"description":559,"slug":560},"TDEE","TDEE (Total Daily Energy Expenditure) represents your total daily energy expenditure. Find out how to calculate it precisely to optimize your results.","tdee",{"title":562,"description":563,"slug":564},"TUT - Time Under Tension","TUT (Time Under Tension) measures the total time the muscle is under load during a set. Key variable for hypertrophy.","tut-time-under-tension",{"title":566,"description":567,"slug":568},"Tabata","Tabata is a 4-minute HIIT protocol: 20 seconds max effort, 10 seconds rest, 8 rounds. Maximum efficiency in minimum time.","tabata",{"title":570,"description":571,"slug":572},"Tempo - Execution speed","Tempo is the controlled speed of each phase of a movement. Powerful tool to maximize stimulus and control.","tempo-execution-speed",{"title":574,"description":575,"slug":576},"Training density","Training density measures the amount of work done per unit of time. Increase it to boost intensity and metabolic stress.","training-density",{"title":578,"description":579,"slug":580},"Training frequency","Training frequency defines how many times per week you work a muscle. Discover the optimal frequency to progress.","training-frequency",{"title":582,"description":583,"slug":584},"Training intensity","Bodybuilding intensity measures the difficulty of the effort. Find out how to calculate it with % of 1RM, RPE, and RIR.","training-intensity",{"title":586,"description":587,"slug":588},"Training volume","Training volume represents the total amount of work performed. Discover the optimal volumes per muscle per week to progress.","training-volume",{"title":590,"description":591,"slug":592},"Type I muscle fibers","Type I fibers (slow-twitch) are endurance-oriented muscle fibers. Resistant to fatigue, they sustain prolonged efforts.","muscle-fibers-type-i",{"title":5,"description":238,"slug":12},{"title":595,"description":596,"slug":597},"Upper/Lower","The Upper/Lower program divides training into upper body and lower body sessions over 4 days per week. Perfect balance between frequency (2x/week) and volume for all levels.","upper-lower",{"title":599,"description":600,"slug":601},"VO2 max","VO2 max is the maximum amount of oxygen your body can use during intense exercise. It's the gold standard of cardiovascular fitness.","vo2-max",{"de":603,"en":12,"es":604,"fr":605,"it":606,"pt":604},"typ-ii-muskelfasern","fibras-musculares-tipo-ii","fibres-musculaires-type2","fibre-muscolari-tipo-ii",1784214985635]