Continuous Biochemical Insight for Athletes: From Lab Tests to On‑Body Sensing

The Use Case

An enquiry came from an early‑stage founder developing a wearable sweat‑sensing patch designed to provide athletes with real‑time biochemical feedback during training.

The proposed system combined:

Continuous lactate monitoring
Cortisol sensing as a physiological stress marker
Integration with commercial wearables (e.g. heart rate and recovery data)
Low‑cost, repeatable testing as an alternative to periodic laboratory lactate threshold tests

This application reflects a broader trend in biosensing: moving biochemical measurement out of controlled laboratory environments and into continuous, on‑body use, where cost, robustness, and repeatability matter as much as analytical performance.

Sensor Selection: Off‑the‑Shelf vs Programme‑Based Technologies

In the enquiry, the founder referenced several Zimmer & Peacock (ZP) sensor products already visible on the webshop, including lactate sensors and calibration solutions, while also asking about availability and pricing for cortisol sensors.

ZP’s response clearly distinguished between:

Commercially available sensor products
Programme‑based technologies requiring structured collaboration

Lactate Sensors: Ready for Prototyping

ZP confirmed that its Generation 1 lactate sensors are available directly via the webshop and are suitable for rapid prototyping:

For applications involving repeated or continuous measurements—particularly on skin—ZP also recommended incorporating a rinse step into the workflow:

Biosensor Rinse Solution

Key insight: Measurement workflow and sensor handling can be just as important as sensor chemistry itself when moving from single tests to continuous or on‑body use.

Cortisol Sensors: Collaboration Rather Than Commodity

While cortisol sensing is a topic of high interest in wearable technology, ZP clarified that cortisol sensors are not offered as an off‑the‑shelf product.

Instead, they are released only as part of well‑funded, structured client programmes.

The rationale is pragmatic rather than restrictive. Cortisol measurement presents additional challenges around:

Validation
Interpretation
Ongoing technical support

These challenges are amplified in non‑laboratory environments. By limiting availability to collaborative programmes, ZP can ensure:

Adequate technical resources
Proper validation and characterisation
Meaningful application‑level support

For founders and R&D teams, this is an important reminder that not all biosensing technologies mature at the same pace, and some analytes require deep collaboration rather than transactional purchasing.

Electronics Matter: Why Hardware–Sensor Matching Is Critical

The enquiry proposed reading ZP sensors using third‑party potentiostat hardware. While ZP noted familiarity with such platforms, they emphasised a key limitation:

ZP sensors are not officially validated on all third‑party electronics.

Instead, ZP recommended using its own electronics, which are:

Designed specifically for ZP’s sensor stack
Characterised with known performance envelopes
Optimised to reduce setup time and experimental uncertainty

For teams aiming to move quickly from concept to usable data, ZP pointed to its single‑purpose biosensor board:

Biosensor Single‑Purpose Board

This highlights a recurring lesson in biosensor development: mismatched electronics can introduce noise, artefacts, or misinterpretation long before chemistry becomes the limiting factor.

Takeaways for Students, Startups, and Innovation Teams

This short exchange surfaces several insights relevant to anyone building wearable or point‑of‑use biosensors:

Start with commercially mature analytes
Technologies like lactate sensing are far more accessible for early prototyping than emerging targets such as cortisol.
Budget for the full measurement workflow
Calibration solutions, rinse steps, and handling protocols are essential for repeatable data.
Electronics are not interchangeable by default
Sensor performance depends heavily on the electronics they are paired with—validated stacks reduce risk and development time.
Some technologies require partnership, not procurement
For complex biomarkers, collaboration often replaces catalogue pricing.

Supporting Early Innovation—With Clear Boundaries

Zimmer & Peacock’s response balanced encouragement with realism: supporting early‑stage innovation where products are ready, while setting clear expectations where technologies remain programme‑based.

For founders and engineers, this kind of transparency can save significant time and cost—and help focus development on what is feasible today.

For more on electrochemical biosensors, measurement workflows, and application‑driven development, explore the wider ZP knowledge base: