ACL Graft Choice Risk Factors ACL-RSI Calculator (Return to Sport Readiness)AHA Pre-Participation Screening AOFAS Ankle-Hindfoot Scale ASES Elbow Score ASES Shoulder Score Acute:Chronic Workload Ratio (ACWR)Altitude Gain Guidelines Ankle Syndesmosis (High Ankle Sprain)Athlete's Heart vs HCM Beighton Score (Joint Hypermobility)Borg CR-10 Scale Borg RPE Scale (6–20)Brighton Criteria (BJHS)Buffalo Concussion Treadmill Test (BCTT)Child SCAT6 (Age 8–12)Commotio Cordis Protocol Cumberland Ankle Instability Tool (CAIT)DASH (UE Disability Index)Doha Groin Agreement ESC HCM SCD Risk Score ESC Pre-Participation Screening Energy Availability Calculator FAI Syndrome (Warwick)FAOS (Foot and Ankle Outcome Score)Fear-Avoidance Beliefs Questionnaire (FABQ)Female Athlete Triad Risk Foot Posture Index (FPI-6)Foot and Ankle Ability Measure (FAAM)Functional Movement Screen (FMS)Graduated Return-to-Play (GRTP) Protocol HAGOS (Hip and Groin Outcome Score)Hamstring Asymmetry Index Heat Index (Apparent Temp)Hip Outcome Score (HOS)Hooper Index (Athlete Wellness)I-PRRS (Psychological Readiness)IKDC (Objective Examination)IKDC (Subjective Knee Evaluation)Injury Severity KJOC Shoulder & Elbow Score KOOS (Knee Outcome Score)KOOS-PS (Physical Function Short Form)Kujala (Anterior Knee Pain Scale)LEAF-Q (LEA Screening)Lake Louise AMS Score Limb Symmetry Index (LSI)Little League Elbow Grading Lysholm Knee Score Marx Activity Rating Scale (MARS)Mayo Elbow Performance Score (MEPS)Modified Schober Test NEXUS C-Spine Criteria Neck Disability Index (NDI)One-Rep Max Estimator Osgood-Schlatter Severity Oswestry Disability Index (ODI)Ottawa Knee Rules Oxford Elbow Score Oxford Shoulder Score PAR-Q+ Readiness Questionnaire PARS-3 Youth Readiness Patellar Instability Severity Score Pitch Smart Guidelines (USA Baseball)Pittsburgh Knee Rules Post-Concussion Symptom Scale (PCSS)QuickDASH (Shoulder & UE)RED-S CAT (Clinical Assessment)Re-injury Anxiety Inventory (RIAI)Relative Age Effect (RAE)Return-to-Play Battery SANE Score (Single Assessment)SCAT6 (Sport Concussion Assessment Tool 6)SCOAT6 (Sub-acute and Office Follow-up)SEAQ-I Appetite Questionnaire STarT Back Screening Tool Session RPE (Internal Load)Sever's Disease Activity Single-Leg Hop Test Battery Standardized Assessment of Concussion (SAC)Steroid Equivalence Calculator Stinger / Burner Grading Sweat Rate and Rehydration TSK-11 (Tampa Scale for Kinesiophobia)TUE Criteria Checklist Tanner Stage Assessment Tegner Activity Scale (TAS)Training Monotony and Strain UCL Injury Risk (Medial Elbow)VISA-A (Achilles Tendinopathy)VISA-P Scale (Patellar Tendinopathy)VO2 Max VOMS (Vestibular/Ocular-Motor Screening)WADA Prohibited List Checker WBGT (Wet Bulb Globe Temp)WORC (Rotator Cuff Index)WOSI (Shoulder Instability Index)Wilks Score (Relative Strength)Wind Chill Index hEDS Diagnostic Criteria (2017)iHOT-33 (International Hip Outcome Tool)

Recent Journal Updates

WHO NewsJun 24, 2026

655 million people still living without electricity underscore urgent need to deliver on universal energy access target

Clinical Context

We think this might be relevant to the clinical guidance for Energy Availability.

FDA MedWatchJun 16, 2026

Disruptions in Availability of Breast Biopsy Needles - Letter to Health Care Providers

Clinical Context

We think this might be relevant to the clinical guidance for Energy Availability.

WHO NewsMay 28, 2026

Message by the WHO Director-General to the people of the Democratic Republic of the Congo

Clinical Context

We think this might be relevant to the clinical guidance for Energy Availability.

Energy Availability Calculator

Energy Availability (EA)

29kcal/kg FFM/d

Low EA — RED-S Risk

Dietary Energy Intake (kcal/day)

2200 kcal

800 kcal5000 kcal

Exercise Energy Expenditure (kcal/day)

600 kcal

0 kcal3000 kcal

Fat-Free Mass (kg)

55 kg

20 kg120 kg

< 30

Low EA

RED-S risk zone

30–45

Sub-optimal

Functional impairment possible

≥ 45

Optimal

Supports health & performance

Formula: EA = (Dietary Energy − Exercise EE) / FFM. FFM can be estimated via DXA, BIA, or skinfolds. Use consistent measurement method for serial monitoring.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Pre-participation screening for female and male athletes at risk of Relative Energy Deficiency in Sport (RED-S), particularly in endurance, aesthetic, and weight-class sports.

Clinical evaluation of athletes presenting with unexplained underperformance, recurrent injuries, menstrual dysfunction (e.g., oligomenorrhea, amenorrhea), or low bone mineral density.

Monitoring of athletes during periods of intentional weight loss or high training loads to ensure energy balance is maintained.

Assessment of athletes with disordered eating or eating disorders to quantify energy deficit severity.

Surveillance in team sports where body composition pressures are high (e.g., gymnastics, figure skating, long-distance running, cycling).

Return-to-play decision-making after RED-S diagnosis, to confirm restoration of adequate energy availability.

Key Indication - RED-S Risk Stratification

Energy availability (EA) is the cornerstone of the International Olympic Committee (IOC) RED-S consensus framework. EA <30 kcal/kg FFM/day is considered low and associated with metabolic and hormonal disturbances, while EA <20 kcal/kg FFM/day is severely low and linked to clinical RED-S manifestations. The ACSM recommends EA assessment in all athletes with suspected RED-S.

When Not to Use / Contraindications

Do not use as a standalone diagnostic tool for eating disorders; requires multidisciplinary assessment.

Invalid in athletes with acute illness or injury that significantly alters energy intake or expenditure.

Unreliable in individuals with inaccurate self-reported dietary intake or exercise logs (e.g., cognitive impairment, language barriers).

Contraindicated in pregnant athletes due to altered energy requirements and body composition changes.

Not suitable for children under 12 years due to growth-related variability in energy needs.

Last Comprehensive Review: 2026

Recent Journal Updates

WHO NewsJun 24, 2026

655 million people still living without electricity underscore urgent need to deliver on universal energy access target

Clinical Context

We think this might be relevant to the clinical guidance for Energy Availability.

FDA MedWatchJun 16, 2026

Disruptions in Availability of Breast Biopsy Needles - Letter to Health Care Providers

Clinical Context

We think this might be relevant to the clinical guidance for Energy Availability.

WHO NewsMay 28, 2026

Message by the WHO Director-General to the people of the Democratic Republic of the Congo

Clinical Context

We think this might be relevant to the clinical guidance for Energy Availability.

Energy Availability Calculator

Energy Availability (EA)

29kcal/kg FFM/d

Low EA — RED-S Risk

Dietary Energy Intake (kcal/day)

2200 kcal

800 kcal5000 kcal

Exercise Energy Expenditure (kcal/day)

600 kcal

0 kcal3000 kcal

Fat-Free Mass (kg)

55 kg

20 kg120 kg

< 30

Low EA

RED-S risk zone

30–45

Sub-optimal

Functional impairment possible

≥ 45

Optimal

Supports health & performance

Formula: EA = (Dietary Energy − Exercise EE) / FFM. FFM can be estimated via DXA, BIA, or skinfolds. Use consistent measurement method for serial monitoring.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Pre-participation screening for female and male athletes at risk of Relative Energy Deficiency in Sport (RED-S), particularly in endurance, aesthetic, and weight-class sports.

Clinical evaluation of athletes presenting with unexplained underperformance, recurrent injuries, menstrual dysfunction (e.g., oligomenorrhea, amenorrhea), or low bone mineral density.

Monitoring of athletes during periods of intentional weight loss or high training loads to ensure energy balance is maintained.

Assessment of athletes with disordered eating or eating disorders to quantify energy deficit severity.

Surveillance in team sports where body composition pressures are high (e.g., gymnastics, figure skating, long-distance running, cycling).

Return-to-play decision-making after RED-S diagnosis, to confirm restoration of adequate energy availability.

Key Indication - RED-S Risk Stratification

When Not to Use / Contraindications

Do not use as a standalone diagnostic tool for eating disorders; requires multidisciplinary assessment.

Invalid in athletes with acute illness or injury that significantly alters energy intake or expenditure.

Unreliable in individuals with inaccurate self-reported dietary intake or exercise logs (e.g., cognitive impairment, language barriers).

Contraindicated in pregnant athletes due to altered energy requirements and body composition changes.

Not suitable for children under 12 years due to growth-related variability in energy needs.

Last Comprehensive Review: 2026