RED-S | Symptoms & Causes
What are the symptoms of RED-S?
The symptoms of RED-S include:
- fatigue
- rapid weight loss
- missed periods or delayed puberty (female athletes)
- low libido (male athletes)
- frequent illness
- hair loss
- trouble focusing
- trouble staying warm
- irritability and depression
RED-S and athletic performance
Low energy availability may lead to short-term performance improvements, however, this effect is temporary. As RED-S depletes their performance, many athletes train even harder, using up even more energy without giving their bodies the fuel or rest they need to get stronger.
RED-S impairs athletic performance in the following ways:
- decreased muscle strength
- decreased endurance
- increased risk of injury
- decreased training response
- impaired judgement
- decreased coordination
- decreased concentration
RED-S | Diagnosis & Treatments
How is RED-S diagnosed?
Low energy availability can be difficult to diagnose and is often overlooked. Ideally, an athlete with symptoms of RED-S should see a sports medicine specialist who takes an athlete’s overall health and well-being, not just an individual injury, into account when making care decisions.
The diagnosis typically begins with a medical history. The clinician may ask the athlete if they have any symptoms such as weakness, fatigue, frequent colds, or interrupted menstrual cycle. They’ll ask about the athlete’s sport and training history, including the number of hours they train per week, whether their training load has increased recently, and if the athlete has noticed a drop in performance. They’ll also ask about the athlete’s eating habits and attitudes toward food.
After the medical history, the doctor will perform a physical exam, which will include measuring blood pressure and heart rate.
Based on what they find, the clinician may rate the athlete as being high, moderate, or low risk for serious harm from RED-S. This will help determine the athlete’s treatment plan.
- An athlete may be considered high risk if they use extreme techniques to lose weight or have signs of a serious medical condition related to RED-S.
- An athlete may be considered at moderate risk if they have lost a significant amount of weight in the past month (5 to 10 percent of their body mass), have irregular periods, or a history of stress fractures.
- An athlete is considered low risk if they have a healthy physique, don’t resort to unhealthy diet or exercise strategies, and are in overall good health.
How is RED-S treated?
The goal of treatment for RED-S is to enable an athlete to participate in sports at a safe and appropriate level, replenishing their energy reserves continuously to support their health and performance.
The athlete’s care team may include:
- a physician, who will monitor and treat the athlete’s physical health
- a dietitian, who will work with the athlete to understand how food provides fuel they need to reach their goals and how to establish healthy eating habits
- a psychotherapist or psychologist, who will help the athlete address underlying issues and anxieties that may contribute to unhealthy exercise and eating habits
Depending on the athlete’s level of risk, they may need to stop training for a while or cut back on training until their health and energy levels are more stable. They may also have an eating plan designed to rebuild strength and vitality.
Is it possible to prevent RED-S?
RED-S is preventable, but true prevention requires a shift in sports culture. Coaches, team doctors, and other sports officials need to prioritize athlete’s health and well-being above all. To this end, Dr. Kathryn Ackerman, director of the Wu Tsai Female Athlete Program, and other specialists have called for the following:
- increased awareness of the negative effects of low energy availability
- safe standards for monitoring athletes’ body composition and weight
- elimination of toxic training environments in which athletes are shamed for the size and shape of their bodies
How we care for RED-S at Boston Children’s Hospital
The Wu Tsai Female Athlete Program takes a comprehensive approach to diagnosing, treating, and managing sports injuries in female athletes and sees athletes of any gender with low energy availability. We start by assessing the whole athlete, including exercise habits, hormonal balance, and nutritional needs — not just symptoms and injuries — to ensure peak performance. We educate young athletes on proper nutrition and its importance in athletic performance. We also educate other clinicians, coaches, and parents on the signs of RED-S and how to intervene appropriately.
As the largest and most experienced pediatric and young adult sports medicine practice in the country, the Sports Medicine Division leads the way for innovation in the prevention and care of sports injuries. We work with athletes of all ages and abilities to help them train and compete at their best.
