Galaxy a5

Optical measurements are realized by taking an image with a Samsung Galaxy A5 (2017, Samsung Electronics, Seoul, South Korea) in a custom-made Photobox (see Figure S1) and analyzing the intensity of the adsorbed bead labelled antibodies, using the software ImageJ (University of Wisconsin-Madison, Madison, WI, USA). For image analysis, the background intensity is subtracted and the calculated values are normalized. Each intensity measurement, shown in this work, is repeated eight times, unless otherwise stated.
In order to estimate the amount of adsorbed bead labelled antibodies, SEM images with a JEOL 7100F (JEOL Ltd., Tokyo, Japan) are carried out. A very low acceleration voltage of 1 keV is used to overcome charging effects and degradation of the polymer during observation. Detailed spectra of oxygen and nitrogen are recorded by XPS, using the Physical Electronics 5600ci (Perkin Elmer, Waltham, MA, USA) to study the influence of the plasma gas composition on the biomolecule immobilization. For the investigation of the surface wettability, contact angle measurements are also performed using a Drop Shape Analysis System DSA 10 MK2 (Krüss, Hamburg, Germany) along with a dispensing needle (Type #5125-1-B, acquired from Nordson EFD, Westlake, OH, USA). Here, the dynamic measurement mode is used by applying 10 µL water droplets. Each measurement is repeated four times.

PA metrics (i.e., tasks and step count) and lower-limb load estimates, described in more detail below, could not all be recorded using a single smart device. At the time of this study, the standard Fitbit™ report did not provide access to raw acceleration data which is essential for the estimation of lower-limb load. So, a Fitbit™ smartwatch was used to measure step count whilst a smartphone was used to capture raw accelerometer data to estimate lower-limb load rate.
Participants were provided with a smartwatch (Fitbit™ Versa series 2, Fitbit Inc., San Francisco, USA) and an Android smartphone (Samsung Galaxy™ A5, Samsung Electronics Inc., Suwon, South Korea), to carry in addition to their primary phone for 10 working days during working hours. Participants were asked to place the smartphone either in their trouser pocket or alternatively, strapped around their waist using a phone holder. Participants were also asked to wear the smartwatch on their non-dominant wrist which is a standard placement site for PA measurement using wrist-worn accelerometers as well as in compliance with the manufacturer recommendations [9 (link), 31 , 32 (link)].