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In the present study we examined the effect on physiological cost of different arm positions when standing up using physiological measurements. Ten healthy young women were used as subjects. They stood up at their own speed from a sitting position on a seat of 40 cm and 20 cm height. Their actions were captured on video and from stills we measured the knee angles at which they found it easiest to stand up. With reference to these measurements, we then set the knee angles at 95° and 125°, respectively, and compared standing up with the arms extended forward in a horizontal position with standing up with the arms held downwards at the sides of the body in a vertical position. Each subject . was required to stand at a prescribed frequency while we measured Oxygen Uptake (VO2), Heart Rate (HR) and Ratings of Perceived Exertion (RPE). The results were, that compared with the vertical position, a reduction of the trunk flexion angle was observed when standing with the arms in the . horizontal position. Also, in the case of standing from the seat of 40 cm height alone, VO2 showed a significantly high value with the arms in the horizontal position, but no significant differences were noticed in HR or RPE. Furthermore, when standing from the seat of 20 cm height, no significant difference was seen between the two arm positions in any of the measured values. From these results we conclude that the movement of standing up with the arms held in the horizontal position does not necessarily have the effect of reducing the physiological cost.

Change of Physiological Cost due to Differences in Arm Position When Standing Up