Related Experiment Video
Updated: Jun 13, 2026

Assessment of Physical Activity Intensity with Accelerometers and Oxygen Consumption
Published on: June 20, 2025
Oxygen uptake kinetics: associations with ambulatory activity and physical functional performance in stroke survivors
Patricia J Manns1, Corey R Tomczak, Anwar Jelani
1Department of Physical Therapy, University of Alberta, Edmonton, AB, Canada. trish.manns@ualberta.ca
Objective:
To explore the associations amongst the on-and-off kinetics time constants, ambulatory activity outcomes, and physical functional performance in stroke survivors.
Design:
Cross-sectional, case control study.
Subjects:
Ten stroke survivors (time since stroke: mean 7.5 years (standard deviation 8.3); gender: 4 males, 6 females) and 10 control subjects matched for age and physical activity level.
Methods:
Oxygen uptake kinetics (on-and-off kinetics) were measured using a submaximal exercise test with a recumbent cycle. The continuous-scale physical functional performance test was used to measure functional ability. Ambulatory activity outcomes including steps per day, number of activity bouts and length of activity bouts were measured using a Step Activity Monitor.
Results And Conclusion:
Shorter activity bouts were significantly associated with longer off-kinetics time constants in stroke survivors (or longer time to recover from an exercise bout). Future research may test the effect of activity interventions designed to increase the length of activity bouts on-kinetics outcomes and functional ability.
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