What is the device that Sinner uses on his arm while training for Wimbledon?

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The image of Jannik Sinner training in Monte Carlo, in preparation for Wimbledon, with a small device attached to his arm has sparked the interest of many, wondering what that little device used by the San Candido tennis player is. It's nothing rare, but rather a sensor known as CGM, which is used to measure glucose.

Faced with this image of Jannik Sinner training with the device, a logical question arose: Why would an elite tennis player need to measure his glucose? The answer doesn't necessarily have to do with an illness, but with an increasingly widespread trend in professional sports: using internal body data to better understand performance, recovery, and moments of low energy.

The context helps to understand why Sinner, advised by his doctors, wanted to monitor his glucose to understand certain things that could be happening to him. After his physical episode at Roland Garros, where he felt disoriented, low on energy, and nauseous, several Italian media outlets reported that Sinner underwent medical checks in Italy to clarify what was behind that collapse.

La Gazzetta dello Sport reported tests conducted at J Medical, while Rai News later mentioned more in-depth examinations at the San Raffaele Hospital in Milan, before his return to Monte Carlo to prepare for Wimbledon. It's likely that from all these studies arose the idea of studying how his glucose responds to different stimuli, to understand what might be happening to him during those moments when his body drops physically in very hot days.

What does that device Sinner uses really measure?

The device seen on Jannik Sinner's arm appears to be a continuous glucose monitoring sensor, known as CGM. It doesn't directly measure blood at every moment, but the glucose present in the interstitial fluid, under the skin, and allows observing trends throughout the day: spikes after eating, drops during exertion, responses to heat, stress, or lack of recovery.

In people with diabetes, these sensors are a well-established medical tool. In healthy athletes, their use is different: it serves to identify patterns. A tennis player can check if they arrive at a training session with sufficient available energy, if they experience drops during long sessions, or if certain foods cause sharp spikes and drops.

Why this might be of interest to Sinner

Modern tennis is a sport of repeated efforts, with matches that can last for hours and under extreme environmental conditions. In Paris, heat was identified as an important factor, although Sinner himself made it clear that he didn't want to attribute everything to temperature. This is where science comes in: heatstroke, partial dehydration, poor carbohydrate replenishment, or an abnormal metabolic response can generate similar sensations like sudden fatigue, dizziness, weakness, or lack of clarity.

It wasn't the first time that Sinner experienced a problem like that on similar days. We saw him go through something similar in Australia, facing Spizzirri, or in Shanghai, against Griekspoor, having to retire from the match there as well.

Scientific evidence on CGM in athletes suggests that these sensors can help tailor nutrition and detect episodes of exercise-related hypoglycemia, although also warning that they shouldn't be interpreted as an absolute truth or a direct predictor of performance. Studies emphasize that glucose responses are highly individual and that the data needs medical, nutritional, and physiological context.

Sinner has been seen these days in Monte Carlo using this device, which has sparked the interest of many, wondering what it is.

It's something very specific.

The Italian seems to be using a glucose sensor, a device increasingly used in elite sports… pic.twitter.com/XZ8hFZTxyd

— José Morón (@jmgmoron) June 17, 2026

One step further in performance monitoring

Therefore, what Sinner is doing doesn't seem like an oddity but a form of prevention. After such a strange episode in Paris, his team is seeking answers: blood analyses, cardiological review, hydration status, thermal stress, training load, recovery, and energy metabolism.

The glucose sensor would be another piece of that puzzle. It doesn't win matches, doesn't by itself prevent heatstroke, and doesn't replace medical judgment, but it can offer valuable information to adjust meals, rest, and training. In a sport where a slight physical drop can alter a Grand Slam victory, understanding how the body responds internally is becoming as important as knowing how to hit the ball.

This news is an automatic translation. You can read the original news, ¿Qué es el dispositivo que usa Sinner en su brazo mientras entrena de cara a Wimbledon?