摘要：Experimental research of hydraulic cylinder type resistance devices at different operating regimes (piston speed and resistance level) has been performed by means of universal computer controlled benchtop materials test-ing machine “Tinius Olsen H25K-T”. The samples were taken from different brands exercisers where resistance is generated by the pair of cylinders: three mini steppers and three rowing exercisers (these with manually adjustable resistance). The research showed that hydraulic cylinder type loading devices of exercise machines generate quite uneven resistance force: depending on the operation re-gime its variation reaches up to 30 % of nominal size. Ac-cording to the results of investigation it may be stated that the nominal resistance force depend on the cylinder used (is different for the same design cylinders of different ven-dors), so it is important to use proper cylinder when replac-ing broken or worn unit or even both cylinders have to be replaced to ensure symmetry of resistance.
