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[Purpose] This study examined the adjustment of work load in the sit-to-stand exercise (STSE). [Subjects] The subjects were twenty-nine healthy young males, average age of nineteen. [Methods] Subjects did STSE and cycle ergometer exercise on the same day. The STSE protocol was standing-up frequencies set from 6 to 30 (times per minute),with an exercise time of three minutes at each frequency. The anaerobic threshold (AT) was determined on a cycle ergometer with a ramp protocol. The items measuring work load were oxygen uptake and heart rate. Cardiopulmonary function was measured from resting time to the end of the exercise. Oxygen uptake volume and heart rate relative to their AT values were calculated. [Results] Oxygen uptake volume and heart rate relative to their AT values frequencies from 6 to 30 times per minute ranged from 45.9 to 119.8 (%), and from 67.6 to 106.9 (%), respectively. [Conclusion] In case of STSE, the work load intensity of a subject cannot be quantitatively determined. Heart rate and oxygen uptake at standing exercise frequencies setting from 6 to 30 times/min relative to their anaerobic threshold values were 67.6-106.9 (%) and 45.9-119.8 (%), respectively. It was clarified that 30 times or less were anaerobic threshold that corresponded to work load . It is appropriate to adjust work load based on this standing up frequency only for young subjects.

The Relationship between Sit-to-stand Frequency and Anaerobic Threshold Determined by Cycle Ergometer