Quick Overview
Scientists at Fudan University tested NMES with 30 national freestyle swimmers for 12 weeks.
Half received NMES before water training; half did not. Underwater sEMG and cameras tracked iEMG, RMS and synergies.
The NMES group posted higher activation in vastus medialis, lateralis and biceps femoris. Propulsion synergy weights rose and postural duration fell.
These facts show EMS boosts muscle activation and coordination for better freestyle kicks.
Peer-reviewed in Sensors by MDPI from a top research centre, the work is solid. Dive into the full post for every detail and what it means for swimmers.
We always provide direct links to the original research at the end of every article so you can review the evidence yourself.
EMS + Water Training = Stronger Kicks (Science Confirms)
Researchers at Fudan University in Shanghai wanted to know something simple: Could adding NMES make a swimmer’s freestyle kick stronger and smarter?
They tested thirty national-level male freestyle swimmers.
All were highly trained athletes with years of competitive experience.
Half received NMES before every water session.
The other half did the same water training without it.
The study lasted twelve weeks.
Three sessions each week took place in the pool.
NMES was applied on land for just three minutes before swimming.
It targeted the vastus medialis, vastus lateralis and biceps femoris.
Frequency was set at 50 Hz with a 200-microsecond pulse width.
Underwater sensors and high-speed cameras recorded every kick.
Scientists measured muscle activity with iEMG and RMS values.
They also mapped how muscles worked together using synergy analysis.
Results showed clear progress for the NMES group.
Key lower-limb muscles produced higher iEMG and RMS signals.
Vastus medialis and biceps femoris gained greater weight inside the main propulsion synergy.
The postural adjustment synergy became shorter and more efficient.
These changes appeared in both the upward and downward phases of the kick.
The control group improved too, yet the gains stayed smaller.
Adding NMES produced stronger muscle activation and cleaner coordination.
The number of basic movement patterns stayed the same.
What changed was how well the body used them.
This work came from Fudan University, a leading research centre in China.
China holds a long and respected scientific tradition.
The paper appeared in the peer-reviewed journal Sensors.
MDPI, based in Switzerland, published the study after careful review.
The findings give clear evidence.
NMES paired with water resistance training helps swimmers activate key muscles more fully.
It also helps them coordinate those muscles with greater efficiency.
For athletes chasing better freestyle kick performance, the results point in a positive direction.
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Research Summary
| Research Detail | Information |
|---|---|
| Full Title | Effects of NMES Combined with Water-Based Resistance Training on Muscle Coordination in Freestyle Kick Movement |
| Authors | Yaohao Guo, Tingyan Gao, Jun Liu |
| Research Institution | Fudan University, Shanghai, China |
| Journal | Sensors |
| Year and Volume | 2026, Volume 26, Article 673 |
| Publisher | MDPI (Basel, Switzerland) |
| Direct Link to Original Study | https://doi.org/10.3390/s26020673 |
| Study Design | 12-week randomised controlled trial |
| Participants | 30 National Level male freestyle swimmers |
| Experimental Group | NMES pretreatment plus water-based resistance training with fins |
| Control Group | Water-based resistance training with fins only |
| NMES Protocol | 50 Hz frequency, 200 µs pulse width, biphasic waveform, applied for 3 minutes on vastus medialis, vastus lateralis and biceps femoris |
| Measurement Tools | Underwater surface electromyography (sEMG) and high-speed video cameras |
| Key Activation Findings | Significantly higher iEMG and RMS values in vastus medialis, vastus lateralis, biceps femoris and other key muscles during upward and downward kick phases |
| Key Coordination Findings | Increased weighting of vastus medialis and biceps femoris in the core propulsion synergy; shortened activation duration of the postural adjustment synergy |
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