An inner side upper foot coupling device for a bicycle pedal is provided made of a cylindrical rod. The blade has a tip, a sharp edge and back. The support device is designed as a gas-filled cushion that changes its shape dependent on the gas pressure therein. The protein fraction of the formula is preferably a hydrolysate prepared by hydrolysing a protein starting material, especially a whey protein with a combination of at least one endo- and at least one exoproteinase. The cavity has a width and height such that an impedance of a transmission line is dependent upon the width and height of the cavity, or the impedance of a transmission line is dependent upon the width of a center conductor within the cavity.