Quick Overview

Scientists in Germany and Sweden tested EMS with arm cycling in a peer-reviewed Journal of Human Kinetics study. Eleven adults rode an arm ergometer to exhaustion, once with EMS and once without.

They tracked heart rate, oxygen uptake, blood lactate and effort. At the same watts, EMS lifted heart rate 2–9%, oxygen uptake 7–15%, lactate 8–46% and effort 4–14%. Peak power fell 10.1%, yet max markers still hit exhaustion.

Those numbers suggest a denser upper-body session for kayaking, rowing, swimming, cross-country skiing and parasports — and for any pro plan that needs more arm-driven load.

Ethics-approved. PubMed-listed. Read the full post for every lab figure.

We always provide direct links to the original research at the end of every article so you can review the evidence yourself.

EMS Turns Up The Heat On Arm Training For Kayak, Row, Swim And Ski Work

A peer-reviewed sports science paper asked a simple training question.
What happens when EMS is added to arm cycling?

The answer was clear in the lab numbers.
The same arm work produced a bigger training stimulus.

This post explains that study in plain language.
Every figure below comes from the published paper.

Why this write-up is based on real science

The paper appeared in 2021 in the Journal of Human Kinetics.
That journal is a peer-reviewed sports science title from the Academy of Physical Education in Katowice, Poland.

Poland has a long record in movement science and elite sport research.
The article is indexed on PubMed.
The DOI is 10.2478/hukin-2021-0016.

The lead author is Prof. Dr. Christoph Zinner.
He works at the University of Applied Sciences for Police and Administration of Hesse in Wiesbaden, Germany.

Co-authors came from the University of Würzburg in Germany.
One co-author came from RWTH Aachen University.
Another came from Mid Sweden University in Östersund.

Germany and Sweden are known for careful exercise physiology.
The protocol had local ethics approval.
It followed the Declaration of Helsinki.

Eleven healthy adults took part.
They were 24 ± 3 years old.
Mean height was 182 ± 10 cm.
Mean body mass was 86 ± 16.8 kg.

They trained for fitness one to three times a week.
They were not a marketing panel.
They were a lab sample under controlled tests.

What the scientists set out to measure

The purpose was not a miracle claim.
It was to measure body responses during incremental arm cycling.

Each person did two tests, seven days apart.
One test used EMS on the upper body.
One test used the same arm work with no EMS.

Order was randomised.
That design helps reduce bias.

The ergometer was a Monark 891E arm cycle.
Work started at 40 watts.
Load rose by 20 watts every three minutes.
Riders continued to volitional exhaustion.

EMS pads sat on both upper arms.
They also sat on the chest, stomach, and upper and lower back.
Settings were 85 Hz, with a 400 ms impulse width.
The duty cycle was 10 seconds on and 2 seconds off.
Intensity was the highest each person could tolerate while still cycling cleanly.

The team measured heart rate.
They measured oxygen uptake.
They measured blood lactate.
They measured ratings of perceived exertion on the Borg 6–20 scale.

Those are standard training markers.
They show how hard a session hits the body.

The headline lab result

Peak power was 10.1% lower with EMS.
Mean peak was 128 ± 30 watts with EMS.
Mean peak was 141 ± 25 watts without it.
That difference was statistically significant (p = 0.01).

That does not mean the session was weaker.
It means riders hit their limit at a lower external wattage.

At exhaustion, the peak markers looked the same.
Heart rate, oxygen uptake, lactate and effort did not differ.
Both trials reached true hard finishes.

Mean max heart rate sat above the 220-minus-age rule of thumb.
Lactate rose above 10 mmol/L in both tests.
The respiratory exchange ratio passed 1.1.
Borg scores hit 20.

So the body still went to the red line.
EMS simply made that line arrive sooner.

Where the extra stimulus showed up

The bright finding sat in the submaximal steps.
That is the zone most athletes use for volume work.

With EMS, submaximal heart rate ran 2–9% higher.
Oxygen uptake ran 7–15% higher.
Blood lactate ran 8–46% higher.
Perceived effort ran 4–14% higher.

Oxygen uptake was significantly higher at 100, 120 and 140 watts.
Those steps matter for endurance sports.

At 140 watts, lactate was 46% higher with EMS.
That is a large metabolic gap at the same crank load.

In plain terms, the arms were doing the same watts.
The body was paying a higher internal cost.

The authors link that to extra motor unit recruitment.
EMS can switch on type I and type II fibres together.
It can do that even when the voluntary load is still moderate.

That is the training logic.
More muscle work at a given pace can mean a denser session.

Which sports the paper points to

This was not a kayak race or a swim time-trial.
It was arm cycling in a laboratory.

The authors still named the sports that live on upper body power.
They listed kayaking.
They listed cross-country skiing.
They listed swimming.
They listed rowing.
They also listed various parasports.

The common thread is simple.
Those sports ask the arms, trunk and back to produce a lot of work.

A tool that raises oxygen uptake and lactate at submaximal arm loads is therefore of interest.
It may help athletes load the engine without needing a higher external wattage.

The same logic can stretch beyond one sport.
Any code that leans on pulling, paddling or poling may care about this stimulus.

The paper also notes a practical training use.
When legs are already tired from hard running or riding, arm cycling can still stress the heart and lungs.
Adding EMS made that upper-body session cost more.

That is a programming idea, not a medical claim.

What this study does not prove

Honesty keeps the piece legit.
This was an acute test, not a 12-week training block.

It does not prove faster race times.
It does not prove bigger muscles after months of use.
The authors say long-term adaptation still needs more research.

It also does not treat injury or illness.
The volunteers were healthy recreational adults.

EMS comfort varies.
Intensity in this trial was limited by discomfort and clean technique.

Those limits belong in any fair summary.

The bright side, in one picture

Picture a 100-watt arm piece.
Without EMS, it is a solid aerobic effort.
With EMS, heart rate, oxygen uptake, lactate and effort all climb.

The athlete has not raised the dial on the ergometer.
The session has still become more demanding.

For kayaking, rowing, swimming, cross-country skiing and parasports, that is the useful hint.
More internal work from the same arm pattern.

That is what the Würzburg, Wiesbaden, Aachen and Östersund team measured.
That is what the Polish sports science journal published.

The takeaway is training-focused and modest.
EMS plus arm cycling can raise the cost of submaximal upper body work.
Athletes who live on arm power now have peer-reviewed numbers to discuss with their coaches.

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