Potentials of Smart dynamometer use for clinical and self-management of rehabilitation in breast cancer survivors: a feasibility study

  • Seungjin Kang
  • Sooyoung Yoo
  • Hyunyoung Baek
  • Junheon Lee
  • Younggeun Choi
  • Hyangjung Kim
  • Hyoseok Yi
  • Eun Joo YangEmail author
Original Article


The aim of this study was to examine the feasibility of the Smart dynamometer as a rehabilitation exercise device in a daily care by comparing with the existing medical devices. We used and analyzed clinical and measurement data of breast cancer survivors who have used Smart dynamometer during their rehabilitation after breast cancer surgery. The Smart dynamometer was compared with the two existing devices of Takei dynamometer and surface electromyography (sEMG) that were used in routine care, respectively. Three key components of the rehabilitation exercise devices were analyzed to validate the feasibility of the Smart dynamometer: grip strength, reaction time, and grip endurance time. Pearson’s correlation analysis was performed to compare the statistical significance between the devices. The data of 12 and 15 female breast cancer patients were analyzed for comparing the Smart dynamometer with Takei dynamometer and sEMG, respectively. There was a very weak correlation between the maximum values from the Takei and the Smart dynamometers in the affected and non-affected arms of breast cancer patients (r = 0.5321, 0.4733). Comparisons of 3 features between the Smart dynamometer and sEMG showed that there were strong positive correlations for both reaction time and endurance time in the affected and non-affected arms (r > 0.9). The feasibility of the Smart dynamometer for the possible use in a daily rehabilitation exercise was partially verified. Moreover, since the Smart dynamometer was highly correlated with time-related variables, it was important and significant to measure both grip strength and time-related information.


Dynamometer Resistance exercise Electromyogram Breast cancer Feasibility study 



This work was funded by SK Telecom Co. Ltd. and partly supported by IT R&D Program of Seoul National University Bundang Hospital and the Creative Industrial Technology Development Program (10053249, Development of Personalized Healthcare System exploiting User Life-Log and Open Government Data for Business Service Model Proof on Whole Life Cycle Care) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Ethical statement

This study was funded by SK Telecom Co. Ltd. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the Helsinki declaration and its later amendments or comparable ethical standards. This was a retrospective, observational study that used clinical data collected during examinations at the department of rehabilitation medicine, therefore informed consent was not required by Institute review board (IRB).


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Copyright information

© Korean Society of Medical and Biological Engineering 2019

Authors and Affiliations

  • Seungjin Kang
    • 1
  • Sooyoung Yoo
    • 1
  • Hyunyoung Baek
    • 1
  • Junheon Lee
    • 2
  • Younggeun Choi
    • 3
  • Hyangjung Kim
    • 4
  • Hyoseok Yi
    • 4
  • Eun Joo Yang
    • 2
    Email author
  1. 1.Healthcare ICT Research Center, Office of eHealth Research and BusinessesSeoul National University Bundang HospitalSeongnamRepublic of Korea
  2. 2.Department of Rehabilitation MedicineSeoul National University Bundang HospitalSeongnam-siRepublic of Korea
  3. 3.Department of Applied Computer EngineeringDankook UniversityYonginRepublic of Korea
  4. 4.NEOFECTYonginRepublic of Korea

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