Can Electrical Stimulation Help With Age-Related Muscle Loss? Sarcopenia and Dynamic FES
BIOELECTRIC TEXTILES · 03
Sarcopenia is the age-related decline in muscle mass and strength, and the fibres responsible for quick, powerful movement — the fast-twitch, type II fibres — are reported to thin out first. Electrical stimulation keeps coming up in this field because it can bypass the voluntary command pathway and recruit fibres that ordinary effort rarely reaches. One systematic review pooling randomised controlled trials reported that stimulation delivered during actual movement (Dynamic FES) was linked to improved strength measures more often than stimulation delivered at rest. Wave Company works on this ground with a mission of slow aging through exercise, through TracMe and its ElecSil™ material technology.
When getting out of a chair starts to feel harder, it is usually filed under losing energy. Much of the change, though, happens in muscle — and more precisely, which muscle fibres shrink first is what alters daily life. This article looks at the pattern of age-related muscle change, then at where electrical stimulation research currently points.
Why is muscle loss more than a cosmetic sign of aging?
Sarcopenia describes muscle mass and strength declining together with age. What matters is less the number than the change in daily life. As muscle declines, walking slows, balance becomes harder to hold, and the risk of a fall rises. The movements that get difficult first are the ones repeated every day: standing up from a chair, climbing a flight of stairs.
For that reason sarcopenia is often treated less as a by-product of aging than as an indicator of how long someone can keep living independently.
Why do the fast fibres go first?
Muscle fibres fall into two broad groups: slow-twitch type I fibres, which sustain effort over time, and fast-twitch type II fibres, which produce short, powerful contractions. With age, the type II fibres are reported to thin earlier and relatively faster.
Fast fibres are involved in quick reactions and in regaining posture. The force that straightens you out when your foot catches on a kerb comes from there. So when fast fibres decline, the ability to respond in a risky moment can fade before the overall mass figure looks alarming. That is why this point comes up whenever fall risk is discussed.
Why does electrical stimulation keep coming up here?
What makes electrical stimulation interesting is that it can skip the usual recruitment order. Under voluntary effort the body recruits lower-force fibres first, and fast fibres join relatively late, only when strong force is required. As vigorous movement becomes harder with age, the opportunity for fast fibres to be recruited at all shrinks.
Electrical stimulation is understood to change that order by bypassing the central nervous pathway, which leaves room to bring fibres into a contraction that voluntary exercise rarely uses. The mechanism, however, does not guarantee the outcome. Reported results differ depending on how the stimulation is delivered.
Which approaches did the research favour?
One systematic review pooling randomised controlled trials addresses exactly this question. It synthesised data from 12 randomised controlled trials covering 455 participants, and reported significant improvement in strength measures in nine of them. The notable pattern was not the intensity of the stimulation but its timing: stimulation delivered during actual movement was linked to good outcomes more often than stimulation delivered while the participant stayed still.
The table below summarises the main approaches used in that body of research. The trends shown are limited to what the cited review reported, and individual results can differ with health status and training history.
Approach | How the stimulation is delivered | Trend reported in the research |
|---|---|---|
Dynamic FES (dynamic functional electrical stimulation) | Synchronised with a real movement, such as standing up from a chair | Most consistently linked to improved strength measures |
NMES combined with resistance training | Stimulation applied alongside strength work | Favourable results reported across several trials |
Static NMES (static neuromuscular electrical stimulation) | Stimulation only, with no movement | Meaningful change reported in participants with limited mobility |
WB-EMS (full-body EMS suit) | Short, repeated sessions in a full-body suit | Considered as an option with lower joint load |
TENS | Nerve stimulation aimed at pain relief | No muscle-building effect established |
Why might Dynamic FES come out ahead?
The review offers several explanations side by side. The first is the recruitment order described above: stimulation can draw in fast fibres that voluntary contraction engages only sparsely. The second is context — when stimulation is matched to a movement that is actually used in daily life, such as rising from a chair, what is trained is more likely to stay attached to that movement. The third is that blood flow and oxygen consumption are reported to rise more steeply when movement and stimulation happen together.
These explanations are not mutually exclusive, and the evidence base is still accumulating. Rather than compressing it into a single verdict, the summary that fits the current evidence is that when the stimulation arrives appears to matter more than how strong it is.
Where does Wave Company fit into this?
Wave Company is a smart textile company with a mission of slow aging through exercise. It received a CES 2024 Innovation Award in digital health.
Two things exist today as consumer products. WaveWear is a sportswear brand combining kinesiology taping with compression. TracMe is an AI fitness solution that embeds the TracSil™ motion-sensing material into a support brace, counts repetitions and tracks balance during stationary bodyweight work such as squats and planks, and recommends the next session from the accumulated data. Its focus is making 15 minutes of daily bodyweight exercise something people actually keep doing.
ElecSil™ is the material technology one step beyond that. Conductive silicone is printed directly onto fabric, so the garment itself becomes the electrode and the wiring, able to read signals from the body and deliver electrical signals through the same surface. The approach this article looked at — matching stimulation to movement, as in Dynamic FES — is hard to repeat daily when pads and leads have to be attached each time. When the garment is the electrode, that repetition becomes far easier.
This application is a possibility the material opens up rather than a finished product: garments with electrical stimulation built in are still in development. What is commercialised and on sale today is WaveWear and TracMe, and the stimulation applications are being prepared as the next step.
Frequently asked questions
At what age should muscle loss be on your radar?
Muscle mass is generally understood to begin declining gradually from the late thirties, with the pace picking up after midlife. Individual variation is wide, though, so watching the signals — walking pace, how stairs feel, getting out of a chair — tends to be more useful than watching a birthday.
Can electrical stimulation replace strength training?
The research so far shows better trends when the two are combined rather than substituted. Reading it as something that supports exercise, not something that reduces the need for it, fits the evidence.
How is Dynamic FES different from ordinary EMS?
The main difference is synchronisation with movement. Dynamic FES times the stimulation to the moment a real movement occurs, while static NMES and ordinary EMS deliver stimulation without movement.
Do TracMe or ElecSil solve sarcopenia?
No. TracMe is a solution for exercise habit and movement data, and ElecSil™ is a material technology for biosignal measurement and the delivery of electrical stimulation. Neither claims an effect on any specific medical condition.
Is electrical stimulation suitable for older adults?
The protocols used in research vary in intensity and placement, and suitability depends on individual health status, including cardiac conditions and altered sensation. Consulting a professional before starting is advisable.
Related reading
If slow aging through exercise is a direction you want to follow, there is more at wavecompany.net. Companies evaluating biosignal sensing or wearable electrical stimulation for their own products are welcome to get in touch through the contact page.
This article is for general information and is not medical advice. Please consult a qualified professional about your own health.
