NMES Recovery Technology Explained: How Peroneal Nerve Stimulation Supports Athlete Recovery

Recovery has become one of the most important aspects of modern athletic performance. Elite athletes, collegiate programs, sports medicine professionals, and active individuals all recognize that how you recover between training sessions can be just as important as how you train.

Today's recovery strategies extend far beyond the athletic training room. Athletes spend significant portions of their day sitting in meetings, classrooms, hotel rooms, buses, airports, and airplanes. Those periods of inactivity create opportunities to support recovery without adding another treatment session to an already busy schedule.

Firefly Recovery was developed with this reality in mind. Using a specialized form of neuromuscular electrical stimulation (NMES), Firefly stimulates the common peroneal nerve to activate the lower-leg muscle pump during periods of inactivity. The result is a wearable recovery solution designed to support circulation and sports recovery while fitting naturally into an athlete's daily routine.

Recovery Technology Has Evolved

Recovery is no longer limited to ice baths, compression boots, or treatment tables.

Athletes often move directly from practice to meals, meetings, travel, or hotel rooms before preparing for another workout or competition. Because these periods already exist in an athlete's schedule, sports medicine professionals increasingly seek recovery technologies that work during normal downtime.

Implementation has become just as important as innovation.

If a recovery intervention is difficult to use, requires extensive setup, or demands staff supervision every time it's used, athlete compliance typically declines. The best recovery technologies are often the ones athletes consistently use because they fit seamlessly into everyday life.

How Firefly's Recovery Technology Works

Firefly uses neuromuscular electrical stimulation to deliver a gentle electrical pulse to the common peroneal nerve.

Stimulating this nerve creates a light rhythmic foot movement, often described as a "foot flutter." That movement activates the muscles of the lower leg, producing rhythmic contractions that help maintain the natural muscle-pump action normally created during walking.

Rather than requiring an athlete to move continuously, Firefly supports circulation during periods when movement naturally decreases, such as while traveling, studying, working, or relaxing after training.

Walking is one of the body's most effective ways to keep the lower-leg muscle pump active. Firefly is designed to recreate that rhythmic activation during periods when walking simply isn't possible.

Why the Common Peroneal Nerve Matters

One of Firefly's biggest differentiators is where it delivers stimulation.

Traditional NMES systems typically place electrodes directly over individual muscles to create localized contractions used for strengthening, rehabilitation, or muscle re-education.

Firefly Recovery takes a different approach.

Instead of targeting individual muscles, Firefly stimulates the common peroneal nerve, creating a coordinated motor response that activates the lower-leg muscle pump through rhythmic foot movement.

This specialized nerve placement makes Firefly fundamentally different from traditional muscle stimulation devices. It also allows athletes to use the device comfortably during normal daily activities without interrupting work, travel, or recovery routines.

TENS vs. Traditional NMES vs. Firefly

Although all three technologies use electrical stimulation, they are designed to achieve very different outcomes. Understanding these differences helps practitioners select the right technology for the right objective.

Feature	TENS	Traditional NMES	Firefly
Primary Purpose	Pain relief	Muscle strengthening and rehabilitation	Support circulation and sports recovery during periods of inactivity
Primary Target	Sensory nerves	Individual muscles	Common peroneal nerve
Muscle Contraction	Minimal or none	Direct contraction of selected muscles	Rhythmic activation of the lower-leg muscle pump
Electrode Placement	Around the area of pain	Over the target muscle(s)	Over the common peroneal nerve
Typical Use	Pain management	Rehabilitation and muscle re-education	Recovery between training sessions, travel, prolonged sitting, and between competitions

While TENS is primarily intended for pain management and traditional NMES is designed to strengthen or rehabilitate specific muscles, Firefly represents a specialized application of NMES. By stimulating the common peroneal nerve, Firefly activates the lower-leg muscle pump to support circulation and sports recovery during periods of inactivity.

What the Research Shows

Neuromuscular electrical stimulation has been extensively studied within sports medicine and rehabilitation.

Research evaluating Firefly's approach has demonstrated increases in lower-limb blood flow, benefits to muscle performance, and reductions in post-exercise soreness.

These physiological responses are particularly relevant during periods of inactivity, when normal muscle-pump activity naturally decreases.

Like any recovery modality, Firefly is designed to complement foundational recovery strategies such as quality sleep, nutrition, hydration, and appropriately managed training loads rather than replace them.

Where Firefly Fits Into Athlete Recovery

One of Firefly's greatest strengths is that it works during situations athletes already experience every day.

Between Training Sessions

After practice, athletes often spend several hours eating, attending meetings, studying, or relaxing before their next workout. Firefly can be worn during the existing downtime without requiring an additional dedicated recovery session.

Between Games and Competitions

Tournament schedules and congested competition calendars rarely provide ideal recovery conditions. Teams often move between venues, buses, hotels, and locker rooms with limited time between events.

Because Firefly requires minimal setup and can be applied independently, it integrates naturally into these environments.

During Travel

Travel presents one of the biggest recovery challenges in modern sport.

Long flights and bus rides reduce opportunities for movement and often leave athletes feeling stiff or heavy-legged. Firefly allows athletes to support circulation while remaining comfortably seated, turning passive travel time into productive recovery time.

Who Uses Firefly Recovery?

Firefly has become part of recovery programs used by a wide range of performance professionals, including:

• Athletic trainers

• Physical therapists

• Strength and conditioning coaches

• Professional sports organizations

• Collegiate athletic programs

• Endurance athletes

• Recreational athletes

• Frequent business travelers

Because the device is lightweight, wire-free, and easy to apply, it scales efficiently from individual athletes to entire teams.

How Does Firefly Recovery Work?

The mechanism is relatively simple:

• Firefly is positioned just below the knee.

• The electrical pulse reaches the peroneal nerve.

• The foot moves rhythmically.

• The calf muscles contract and relax repeatedly.

• The lower-leg muscle pump remains active during inactivity.

The process occurs while the athlete continues with normal activities, without requiring a separate recovery session. Firefly Recovery is FDA-cleared as a Class II device and clinically proven to reduce soreness, accelerate recovery, and improve muscle performance.

Final Words 

Recovery technology continues to move toward solutions that fit the realities of modern sport. Practitioners increasingly need interventions that are easy to implement, require minimal supervision, and work within the time athletes already have available.

Firefly's NMES approach reflects this shift. Using peroneal nerve stimulation to create repeated lower-leg muscle contractions during periods of inactivity offers a practical way to support circulatory recovery without adding unnecessary complexity to an athlete's routine.

Armando Rivas joined the Golden State Warriors as an Athletic Trainer in February 2025. He brings extensive experience in sports medicine, with prior NBA stops in Miami, Chicago, Minnesota, and Philadelphia. Before his NBA career, he served as Director of Sports Medicine and Head Athletic Trainer for the Los Angeles Galaxy and as Head Athletic Trainer for minor league affiliates of the Los Angeles Angels. He holds a Bachelor of Science in Athletic Training from Cal State Fullerton and a Master of Science in Exercise Physiology from Cal Poly Pomona. A California native, he resides in Rancho Mission Viejo.