[{"data":1,"prerenderedAt":686},["ShallowReactive",2],{"lexique-en-muscle-mass":3,"lexique-all-en":327,"lexique-trans-en-muscle-mass":680},{"id":4,"title":5,"body":6,"description":317,"extension":318,"lang":319,"letter":320,"meta":321,"navigation":322,"path":323,"ref":12,"seo":324,"stem":325,"__hash__":326},"lexique/lexique/en/muscle-mass.md","Muscle mass",{"type":7,"value":8,"toc":305},"minimark",[9,13,18,29,32,35,38,43,90,92,96,164,166,170,208,210,213,215,219,226,233,235,239,265,267,271,288,290,294],[10,11,5],"h1",{"id":12},"muscle-mass",[14,15,17],"h4",{"id":16},"definition","Definition",[19,20,21,24,25,28],"p",{},[22,23,5],"strong",{}," is the ",[22,26,27],{},"total weight of skeletal muscles in the body",". It typically represents 30-50% of total body weight in an adult, depending on sex, age, and training level.",[30,31],"blockquote",{},[19,33,34],{},"💡 Muscle mass is metabolically active, even at rest. Each kg of muscle burns ~13 kcal/day vs ~5 kcal for the same weight of fat.",[36,37],"hr",{},[39,40,42],"h3",{"id":41},"why-is-muscle-mass-crucial","Why is muscle mass crucial?",[44,45,46,54,60,66,72,78,84],"ul",{},[47,48,49,50,53],"li",{},"✅ ",[22,51,52],{},"Higher metabolism",": more muscle = higher TDEE",[47,55,49,56,59],{},[22,57,58],{},"Functional strength",": daily life and sport performance",[47,61,49,62,65],{},[22,63,64],{},"Insulin sensitivity",": better blood sugar regulation",[47,67,49,68,71],{},[22,69,70],{},"Bone health",": muscle stimulates the skeleton",[47,73,49,74,77],{},[22,75,76],{},"Longevity",": studies link muscle mass to lower mortality",[47,79,49,80,83],{},[22,81,82],{},"Sarcopenia prevention",": muscle loss from aging",[47,85,49,86,89],{},[22,87,88],{},"Aesthetics",": athletic, full silhouette",[36,91],{},[39,93,95],{"id":94},"reference-values","Reference values",[97,98,99,112],"table",{},[100,101,102],"thead",{},[103,104,105,109],"tr",{},[106,107,108],"th",{},"Profile",[106,110,111],{},"% of muscle mass",[113,114,115,124,132,140,148,156],"tbody",{},[103,116,117,121],{},[118,119,120],"td",{},"Sedentary man (30 yr)",[118,122,123],{},"30-40%",[103,125,126,129],{},[118,127,128],{},"Active man (30 yr)",[118,130,131],{},"40-45%",[103,133,134,137],{},[118,135,136],{},"Trained athlete",[118,138,139],{},"45-55%",[103,141,142,145],{},[118,143,144],{},"Sedentary woman (30 yr)",[118,146,147],{},"25-30%",[103,149,150,153],{},[118,151,152],{},"Active woman (30 yr)",[118,154,155],{},"30-35%",[103,157,158,161],{},[118,159,160],{},"Trained female athlete",[118,162,163],{},"35-40%",[36,165],{},[39,167,169],{"id":168},"how-to-gain-muscle-mass","How to gain muscle mass?",[44,171,172,178,184,190,196,202],{},[47,173,49,174,177],{},[22,175,176],{},"Heavy strength training",": 3-5 sessions/week",[47,179,49,180,183],{},[22,181,182],{},"Progressive overload",": regular increase",[47,185,49,186,189],{},[22,187,188],{},"High protein",": 1.6-2.2 g/kg of bodyweight",[47,191,49,192,195],{},[22,193,194],{},"Moderate caloric surplus",": +200-400 kcal",[47,197,49,198,201],{},[22,199,200],{},"Quality sleep",": 7-9 hours/night",[47,203,49,204,207],{},[22,205,206],{},"Patience",": 0.5-2 kg/month max",[30,209],{},[19,211,212],{},"⚠️ Realistic expectations: a beginner can gain 8-12 kg of muscle in year 1. An advanced lifter, less than 1-2 kg/year.",[36,214],{},[39,216,218],{"id":217},"muscle-mass-and-aging","Muscle mass and aging",[19,220,221,222,225],{},"After 30, sedentary people lose ",[22,223,224],{},"3-5% of their muscle mass per decade",". Past 60, the rate accelerates dramatically (sarcopenia).",[19,227,228,229,232],{},"The good news: strength training stops or reverses this loss ",[22,230,231],{},"at any age",". Studies show that 80-year-olds can still build significant muscle.",[36,234],{},[39,236,238],{"id":237},"how-to-measure-muscle-mass","How to measure muscle mass",[44,240,241,247,253,259],{},[47,242,243,246],{},[22,244,245],{},"DEXA scan",": gold standard, accurate measurement",[47,248,249,252],{},[22,250,251],{},"Bioimpedance scale",": indicative, ±5-10%",[47,254,255,258],{},[22,256,257],{},"Anthropometry",": girth measurements + skinfolds",[47,260,261,264],{},[22,262,263],{},"Visual estimation",": progress photos",[36,266],{},[39,268,270],{"id":269},"common-mistakes","Common mistakes",[44,272,273,276,279,282,285],{},[47,274,275],{},"❌ Believing only weight matters (composition is what counts)",[47,277,278],{},"❌ Cutting too aggressively → muscle loss",[47,280,281],{},"❌ Ignoring protein",[47,283,284],{},"❌ Stopping strength training when getting older",[47,286,287],{},"❌ Comparing to enhanced athletes",[36,289],{},[39,291,293],{"id":292},"key-takeaways","Key takeaways",[19,295,296,297,300,301,304],{},"Muscle mass is ",[22,298,299],{},"much more than aesthetics",": it's a pillar of health, longevity, and performance. Build it (heavy training + protein + surplus) and protect it (resistance training every week, even later in life). ",[22,302,303],{},"An investment that pays for life",".",{"title":306,"searchDepth":307,"depth":307,"links":308},"",2,[309,311,312,313,314,315,316],{"id":41,"depth":310,"text":42},3,{"id":94,"depth":310,"text":95},{"id":168,"depth":310,"text":169},{"id":217,"depth":310,"text":218},{"id":237,"depth":310,"text":238},{"id":269,"depth":310,"text":270},{"id":292,"depth":310,"text":293},"Muscle mass is the total weight of muscles in the body. Key indicator of strength, metabolism, and longevity.","md","en","M",{},true,"/lexique/en/muscle-mass",{"title":5,"description":317},"lexique/en/muscle-mass","KeSVpya74cnSxiwRac7x0FoH2U5TtozrjbapdyGu-lI",[328,332,336,340,344,348,352,356,360,364,368,372,376,380,384,388,392,396,400,404,408,412,416,420,424,428,432,436,440,444,448,452,456,460,464,468,472,476,480,484,488,492,496,500,504,508,512,516,520,524,525,529,533,537,541,545,549,553,557,561,565,568,572,576,580,584,588,592,596,600,604,608,612,616,620,624,628,632,636,640,644,648,652,656,660,664,668,672,676],{"title":329,"description":330,"slug":331},"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":333,"description":334,"slug":335},"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":337,"description":338,"slug":339},"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":341,"description":342,"slug":343},"Active recovery","Active recovery uses light activity to speed muscle recovery. Find out how to effectively integrate it into your routine.","active-recovery",{"title":345,"description":346,"slug":347},"Adduction","Adduction is a movement that brings a body part toward the body's midline. Opposite of abduction.","adduction",{"title":349,"description":350,"slug":351},"Aerobic System","The aerobic system produces energy with oxygen, fueling long-duration efforts. It's the foundation of endurance and recovery.","aerobic-system",{"title":353,"description":354,"slug":355},"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":357,"description":358,"slug":359},"Anaerobic System","The anaerobic system produces energy without oxygen — for explosive, intense efforts. Limited but powerful, it fuels strength and sprints.","anaerobic-system",{"title":361,"description":362,"slug":363},"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":365,"description":366,"slug":367},"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":369,"description":370,"slug":371},"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":373,"description":374,"slug":375},"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":377,"description":378,"slug":379},"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":381,"description":382,"slug":383},"Bodyweight","Bodyweight training uses your own body as resistance. No equipment, anywhere, scalable to any level.","bodyweight",{"title":385,"description":386,"slug":387},"Calorie Maintenance","Caloric maintenance is the calorie level keeping your weight stable. Foundation of any nutritional plan.","calorie-maintenance",{"title":389,"description":390,"slug":391},"Calorie Surplus","A caloric surplus means consuming more calories than you burn. Mandatory mechanism for serious muscle building.","calorie-surplus",{"title":393,"description":394,"slug":395},"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":397,"description":398,"slug":399},"Calories","Calories measure the energy provided by food. Understanding your caloric needs is the foundation of every fitness goal.","calories",{"title":401,"description":402,"slug":403},"Carbohydrates","Carbohydrates are the main source of energy for intense training. Discover your needs, the different types and their role in performance.","carbohydrates",{"title":405,"description":406,"slug":407},"Circuit training","Circuit training chains several exercises with little rest. Ideal for burning calories and improving cardiovascular fitness while keeping muscle.","circuit-training",{"title":409,"description":410,"slug":411},"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":413,"description":414,"slug":415},"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":417,"description":418,"slug":419},"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":421,"description":422,"slug":423},"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":425,"description":426,"slug":427},"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":429,"description":430,"slug":431},"Dropset","A dropset extends a set by reducing the load when failure hits. Powerful intensification method for hypertrophy.","dropset",{"title":433,"description":434,"slug":435},"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":437,"description":438,"slug":439},"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":441,"description":442,"slug":443},"Extension","Extension is the anatomical movement that increases the angle between two body segments. Opposite of flexion.","extension",{"title":445,"description":446,"slug":447},"Fat mass","Fat mass is the total weight of fat tissue. Essential for survival, but excess harms health and aesthetics.","fat-mass",{"title":449,"description":450,"slug":451},"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":453,"description":454,"slug":455},"Flexion","Flexion is the anatomical movement that decreases the angle between two body segments. Opposite of extension.","flexion",{"title":457,"description":458,"slug":459},"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":461,"description":462,"slug":463},"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":465,"description":466,"slug":467},"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":469,"description":470,"slug":471},"Hypertrophy","Muscle hypertrophy is the increase in muscle fiber size. It's the primary mechanism behind muscle growth from resistance training.","hypertrophy",{"title":473,"description":474,"slug":475},"Hypertrophy Training","Hypertrophy training aims to maximize muscle growth using moderate loads (65-85% 1RM) with 8-15 repetitions per set.","hypertrophy-training",{"title":477,"description":478,"slug":479},"Intra-workout","Intra-workout refers to nutrition consumed during training to maintain energy, hydration and performance on long sessions.","intra-workout",{"title":481,"description":482,"slug":483},"Isometric","Isometric contraction is when the muscle produces tension without changing length. No visible movement, intense work.","isometric-contraction",{"title":485,"description":486,"slug":487},"Lean mass","Lean mass is everything in your body except fat: muscles, bones, organs, water. A real performance indicator.","lean-mass",{"title":489,"description":490,"slug":491},"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":493,"description":494,"slug":495},"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":497,"description":498,"slug":499},"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":501,"description":502,"slug":503},"Maintenance","Maintenance is the calorie level at which your weight remains stable. The neutral baseline for any nutritional strategy.","maintenance",{"title":505,"description":506,"slug":507},"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":509,"description":510,"slug":511},"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":513,"description":514,"slug":515},"Mesocycle","A mesocycle is a 4-8 week training block with a specific objective (hypertrophy, strength, peak, deload). The cornerstone of periodization.","mesocycle",{"title":517,"description":518,"slug":519},"Microcycle","A microcycle is the smallest planning unit in bodybuilding: generally 1 week of training. This is your weekly routine.","microcycle",{"title":521,"description":522,"slug":523},"Mobility","Mobility is the ability to actively control range of motion. Find out how to improve your mobility to optimize your performance.","mobility",{"title":5,"description":317,"slug":12},{"title":526,"description":527,"slug":528},"Muscular Endurance Training","Muscular endurance training develops the ability to sustain prolonged effort. Light loads, high reps, short rests.","muscular-endurance-training",{"title":530,"description":531,"slug":532},"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":534,"description":535,"slug":536},"Muscular strength","Muscular strength is the maximum force a muscle (or group) can produce. The fundamental physical quality of any athlete.","muscular-strength",{"title":538,"description":539,"slug":540},"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":542,"description":543,"slug":544},"PR - Personal Record","A PR (Personal Record) is your best performance ever on a movement. The fundamental progress marker.","pr-personal-record",{"title":546,"description":547,"slug":548},"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":550,"description":551,"slug":552},"Periodization","Periodization is the cyclical organization of training into distinct phases to optimize progression, prevent plateaus, and avoid injuries.","periodization",{"title":554,"description":555,"slug":556},"Plateau","A plateau is a period of stagnation despite consistent training. Identifying the cause is the key to breaking it.","plateau",{"title":558,"description":559,"slug":560},"Post-workout","The post-workout is the nutrition right after training to optimize recovery and growth. Protein, carbs, hydration.","post-workout",{"title":562,"description":563,"slug":564},"Pre-workout","The pre-workout is the meal or supplement taken before training to optimize performance. Energy, focus, and pump.","pre-workout",{"title":182,"description":566,"slug":567},"Progressive overload is the foundational principle of training: gradually increasing the demand on your muscles to keep gaining strength and size.","progressive-overload",{"title":569,"description":570,"slug":571},"Protein","Protein is the essential macronutrient for building and repairing muscle. Discover your needs, the best sources and the optimal timing.","protein",{"title":573,"description":574,"slug":575},"Protein powder","Protein powders are concentrated protein supplements. Practical for hitting daily protein needs.","protein-powder",{"title":577,"description":578,"slug":579},"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":581,"description":582,"slug":583},"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":585,"description":586,"slug":587},"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":589,"description":590,"slug":591},"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":593,"description":594,"slug":595},"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":597,"description":598,"slug":599},"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":601,"description":602,"slug":603},"Rest-Pause","Rest-pause is an intensification method using ultra-short pauses to extend a set. Powerful tool for hypertrophy.","rest-pause",{"title":605,"description":606,"slug":607},"Sarcomere","The sarcomere is the basic contractile unit of muscle. Composed of actin and myosin, it produces all your movements.","sarcomere",{"title":609,"description":610,"slug":611},"Series (Sets)","A series (or set) is a group of consecutive reps without rest. The basic unit of training programming.","series-sets",{"title":613,"description":614,"slug":615},"Sleep","Sleep is the most underrated training variable. It's during sleep that recovery, muscle building, and hormonal regulation happen.","sleep",{"title":617,"description":618,"slug":619},"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":621,"description":622,"slug":623},"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":625,"description":626,"slug":627},"Stretching","Stretching improves flexibility and range of motion. Learn about the different types and how to effectively incorporate them into your routine.","stretching",{"title":629,"description":630,"slug":631},"Superset","A superset chains two exercises with no rest between them. Time-efficient method that boosts intensity and density.","superset",{"title":633,"description":634,"slug":635},"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":637,"description":638,"slug":639},"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":641,"description":642,"slug":643},"Tabata","Tabata is a 4-minute HIIT protocol: 20 seconds max effort, 10 seconds rest, 8 rounds. Maximum efficiency in minimum time.","tabata",{"title":645,"description":646,"slug":647},"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":649,"description":650,"slug":651},"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":653,"description":654,"slug":655},"Training frequency","Training frequency defines how many times per week you work a muscle. Discover the optimal frequency to progress.","training-frequency",{"title":657,"description":658,"slug":659},"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":661,"description":662,"slug":663},"Training volume","Training volume represents the total amount of work performed. Discover the optimal volumes per muscle per week to progress.","training-volume",{"title":665,"description":666,"slug":667},"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":669,"description":670,"slug":671},"Type II muscle fibers","Type II fibers (fast-twitch) are powerful muscle fibers optimized for explosive efforts. Essential for strength and power.","type-ii-muscle-fibers",{"title":673,"description":674,"slug":675},"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":677,"description":678,"slug":679},"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":681,"en":12,"es":682,"fr":683,"it":684,"pt":685},"muskelmasse","masa-muscular","masse-musculaire","massa-muscolare","massa-muscular",1784214982793]