Energy cost and cardiovascular response to upper and lower limb rhythmic exercise with different equipments in normal-weight and severely obese individuals

Aims: The purpose of the study was to assess energy expenditure and cardiovascular response to rhythmic activity with 6 machines exercising different arm and leg muscle groups in normal-weight (NW) and obese (OB) individuals. Methods: In 16 extremely OB subjects and 15 NW controls, oxygen uptake (VO₂), heart rate (HR), blood lactate (LA) concentration and ratings of perceived exertion (RPE) were determined during submaximal rhythmic exercise at different intensities obtained by increasing the frequency of the movement (FOM) with each machine. Peak VO₂ (VO₂p) for each equipment was determined with incremental tests up to exhaustion, whereas maximal VO₂ was estimated at cycle ergometer. Results: Net energy cost (Enet) of exercise increased (p2p were attained with lower limbs than with upper limbs, in both NW (p2 (relative to maximal), HR, LA, and RPE were similar in NW and OB but higher during arm than leg activity (p2 (relative to VO ₂p) no difference was detected. Conclusion: Enet of rhythmic exercise is higher in OB than NW with machines requiring wide displacement of large body segments. For both NW and OB, physiological responses and RPE are importantly affected by the relative activation of involved muscles. LA concentration is an important determinant of RPE, independent of the limb in activity.