Fitness
Follow Fitness in the Factlen app and get an alert when there is news. Get the app
Athlete Health
Slovenian Olympian Katja Fain Reveals Chronic Myeloid Leukemia Diagnosis
5 sources · 38d ago
Explainer
The 70-90 RPM Range: How Pedal Cadence Optimizes the Trade-Off Between Muscular Fatigue and Cardiovascular Strain
6 sources · 40d ago
Explainer
The 84% Exhalation: How Fat Loss Converts Stored Triglycerides Into Carbon Dioxide and Water
5 sources · 40d ago
More in Fitness
ExplainerGlycogen Metabolism
The 300-400% Glycogen Increase: How the Depletion-Repletion Cycle Upregulates Glycogen Synthase to Maximize Muscle Fuel Stores
Moderate Taper Advocates 40%Metabolic Researchers 40%Traditional Carbohydrate Loaders 20%
ExplainerBlister Prevention
The 40% Reduction in Blister Risk: How Paper Tape Stabilizes Skin Layers to Minimize Shear Deformation
Preventative Taping Advocates 50%Traditional Cushioning Proponents 30%Clinical Researchers 20%
ExplainerRecovery Science
The 24-Hour Window: Why Cold Water Immersion Immediately Post-Workout Blunts Muscle Protein Synthesis
Hypertrophy Researchers 40%Clinical Health Providers 35%Evidence-Based Coaches 25%
ExplainerHeart Rate Variability
The 6-Breaths-Per-Minute Rate: How Slow Respiration Maximizes Vagal Tone and Heart Rate Variability
Clinical Psychophysiologists 40%Biofeedback Researchers 35%Sports Science Analysts 25%
Anti-Doping PolicyRegulatory Decision
WADA Keeps GLP-1 Weight-Loss Drugs Off 2027 Banned List, Updates Cannabinoid Rules
Anti-Doping Regulators 40%Sports Medicine Physicians 30%Endurance Athletes & Coaches 30%
ExplainerBiomechanics
The 3-to-1 Force Ratio: How the Ground Reaction Force in a Single-Leg Stance Dictates the Optimal Load for Grappling Strength Training
Functional Biomechanics Advocates 40%Combat Sports S&C Coaches 35%Sports Science Researchers 25%
Deep DiveFlexibility Science
The Neurological Hack That Outperforms Static Stretching for Immediate Flexibility
Neurological Flexibility Advocates 50%Structural Adaptation Proponents 50%
Track & FieldChampionship Result
Masai Russell Claims Inaugural World Athletics Ultimate Championship 100m Hurdles Title
Global Athletics Coverage 50%Nigerian Sports Media 50%
ExplainerRehabilitation Timelines
The 5-to-8 Week Threshold: How Long Pilates Must Last to Improve Chronic Low Back Pain
Clinical Researchers 40%Physical Therapists 35%Rehabilitation Specialists 25%
Pediatric CancerCharity Event
Swim Across America's San Francisco Event Raises $7 Million for Pediatric Cancer Research
Fundraising Organizers 40%Medical Beneficiaries 30%Local Community 30%
ExplainerStrength Science
The 0-4 Reps in Reserve Sweet Spot: How Proximity to Failure Maximizes Hypertrophy While Minimizing Neuromuscular Fatigue
Volume & Frequency Proponents 45%Clinical Researchers 35%Intensity Proponents 20%
ExplainerBlood Flow Restriction
The 40-80% Arterial Occlusion Pressure: How Venous Pooling and Metabolic Stress Induce Muscle Hypertrophy at 20% 1RM
Clinical Rehabilitation Specialists 35%Exercise Physiologists 35%Sports Performance Coaches 30%
Anti-Doping PolicyRegulatory Shift
WADA Bars Olympic Host Nations' Anti-Doping Agencies From Testing Their Own Athletes
Global Anti-Doping Regulators 65%U.S. Anti-Doping Officials 35%
ExplainerMuscle Hypertrophy
The 20-40 Second Set Duration: How Time Under Tension Maximizes Mechanical Tension for Muscle Growth
Clinical Researchers 40%Commercial Fitness Coaches 30%Evidence-Based Practitioners 30%
Wearable TechFeature Update
Amazfit Firmware Update Adds FTMS Smart Trainer Support and On-Watch HYROX Analysis
Hybrid Fitness Competitors 40%Indoor Cycling Purists 35%Value-Conscious Tech Adopters 25%
Wearable TechSoftware Update
Garmin Releases System Software 23.31 for Fenix 8 and Enduro 3 Lines
Everyday Athletes 60%Specialist Sportsmen 40%
Endurance Physiology
Conservative Pacing and Early Fueling Delay Glycogen Depletion on Long Runs
Endurance Coaches 40%Sports Dietitians 40%Wearable Technologists 20%
ExplainerAerobic Base
Sweet Spot vs. Polarized Training: How Weekly Volume Dictates the Optimal Cycling Base
Time-Crunched Pragmatists 40%Physiological Purists 40%Volume-Dependent Centrists 20%
ExplainerStretch-Shortening Cycle
Why Tendons Only Stiffen When Ground Contact Drops Below 250 Milliseconds
Biomechanics Researchers 40%Sprint & Jump Coaches 35%Recreational Endurance Runners 25%
Deep DiveThermic Effect
The 20-30% Digestion Tax: How Protein's Thermic Effect Compares to Carbohydrates and Fats
High-Protein Advocates 40%Mixed-Meal Proponents 40%Metabolic Skeptics 20%
ExplainerHeart Rate Monitors
Why Wrist-Based Heart Rate Monitors Lag During Sprints, and When to Trust Them
Clinical Precision Advocates 35%Practical Training Coaches 35%Wearable Tech Developers 30%
ExplainerEndurance Metrics
The 42-Day Decay Rate: How Training Impulse Math Predicts Peak Athletic Readiness
Sports Data Scientists 40%Endurance Coaches 35%Commercial Platform Developers 25%
ExplainerMetabolic Conditioning
The 2.0 mmol/L Inflection Point: How a Single Blood Marker Defines the Boundary of Aerobic Base Training
Clinical Exercise Physiologists 40%Applied Endurance Coaches 35%Sports Technology Developers 25%
ExplainerSwimming Biomechanics
The Hydrodynamic Catch: How Lift Forces and Vortex Shedding Propel Elite Freestyle Swimmers
Hydrodynamic Efficiency Researchers 41%Lift and Vortex Proponents 41%Technological Interventionists 18%
ExplainerLoad Carriage
The 20% Body Weight Threshold: Where Backpack Load Limits Diverge Between Metabolic Cost and Joint Strain
Biomechanical Researchers 40%Outdoor Industry Guidelines 35%Physiological Analysts 25%
Wearable TechFeature Update
Apple Watch Series 12 Introduces 'Health Age' Metric and Readiness Scoring Alongside Upgraded Heart Rate Sensor
Wearable Technology Analysts 40%Apple Ecosystem Users 35%Fitness Hardware Skeptics 25%
ExplainerSupplement Science
The 0.7% Water Retention Trade-Off: How Creatine Drives Muscle Growth Through ATP Regeneration
Clinical Researchers 45%Sports Nutritionists 35%Physiology Analysts 20%
ExplainerConnective Tissue
Collagen Fiber Reorientation: How Sustained Load and Hydration Remodel Connective Tissue for Long-Term Flexibility
Biomechanical Researchers 40%Sports Nutritionists 30%Clinical Physical Therapists 30%
Deep DiveMuscle Physiology
The Cellular Vault: How Muscle Fibers Retain Their Nuclei Through Months of Detraining
Cellular Physiologists 40%Sports Medicine & Rehab 35%Anti-Doping Regulators 25%
Deep DiveMobility Training
How Percussive Therapy and Dynamic Stretching Differ in Building Range of Motion
Device-Assisted Recovery Advocates 40%Traditional Mobility Proponents 40%Evidence-Based Skeptics 20%
ExplainerRecovery Science
Mechanoreceptor Activation: Why Foam Rolling Increases Range of Motion by Modulating the Autonomic Nervous System, Not Breaking Up Adhesions
Neurological Model Advocates 45%Evidence-Based Skeptics 30%Traditional Mechanical Proponents 25%
Combat ReadinessPolicy Shift
Pentagon Codifies Sex-Neutral Fitness Standards Across All Military Branches
Defense Policy & Leadership 40%Frontline Personnel & Advocates 30%Global Defense Observers 30%
ExplainerCore Biomechanics
The Deep Core Anchor: How Pelvic Floor Co-Contraction Redefines Lumbar Stability
Clinical Rehabilitation Specialists 40%Biomechanics Researchers 35%Traditional Pilates Instructors 25%
ExplainerMuscle Physiology
The 1.7x Force Multiplier: How the Lowering Phase of a Lift Drives Greater Muscle Growth
Hypertrophy Researchers 40%Clinical Rehabilitation Specialists 35%Strength and Conditioning Coaches 25%
ExplainerEndurance Fueling
How Endurance Athletes Train the Gut to Prevent Gastrointestinal Distress
Sports Dietitians 40%Gastroenterologists 35%Endurance Coaches 25%
Functional Hypertrophy
The Functional Hypertrophy Shift: How Odd-Object Lifting and Isometric Bracing Are Redefining Muscle Growth
Functional Performance Advocates 70%Nutritional Support & Recovery 30%
ExplainerRunning Biomechanics
Impact Speed Over Force: Why Vertical Loading Rates Predict Running Stress Fractures Better Than Peak Impact
Gait Retraining Advocates 40%Structural Biomechanists 40%Clinical Synthesizers 20%
Recovery NutritionEvidence Pack
The 3:1 Carbohydrate-to-Protein Ratio: How Insulin Signaling Accelerates Post-Exercise Glycogen and Muscle Repair
Endurance Physiologists 40%Strength and Conditioning Coaches 30%Clinical Nutritionists 30%
ExplainerDietary Restraint
Flexible Dieting vs. Rigid Meal Plans: How Dietary Restraint Dictates Post-Diet Muscle Loss
Flexible Restraint Researchers 60%Clinical Comparison Analysts 40%
ExplainerAerodynamic Drag
The 30-Watt Penalty: How Drafting Reduces Aerodynamic Drag and Saves Energy in a Peloton
Aerodynamic Researchers 40%Endurance Athletes & Coaches 40%Race Officials & Regulators 20%
Metabolic ScienceMechanism Explainer
Pterostilbene's PPAR-Delta Stabilization: How a Blueberry Compound Forces Skeletal Muscle to Break Down Fat
Metabolic Researchers 45%Nutritional Scientists 35%Public Health Advocates 20%
ExplainerVO2 Max Training
The 4-Minute Exhaustion Window: How Maximal Aerobic Speed Defines the Optimal Duration and Intensity for VO2max Intervals
Exercise Physiologists 50%Endurance Coaches 30%Recreational Athletes 20%
ExplainerPre-Race Fueling
How Alcohol Disrupts Taper Week: The Physiological Cost of a Pre-Race Drink
Medical Consensus 45%Sleep Researchers 30%Endurance Athletes 25%
ExplainerWater Treatment
The 0.1-Micron Threshold: Why Standard Backpacking Filters Catch Bacteria but Miss Viruses
Domestic Backcountry Hikers 40%International Travelers & Health Agencies 40%Filtration Engineers 20%
ExplainerMuscle Plasticity
Myosin Heavy Chain Isoform Expression: The Mechanism Driving Muscle Fiber Plasticity from Type IIx to Type IIa
Molecular Physiologists 40%Strength and Conditioning Coaches 35%Mind-Body Practitioners 25%
Oncology FitnessClinical Trial
12-Week Supervised Exercise Protocol Mitigates Hormone Therapy Side Effects in Prostate Cancer Trial
Clinical Oncologists 40%Exercise Physiologists 35%Patient Advocates 25%
Per page