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Two chair test: a substitute of 6 min walk test appear cardiopulmonary reserve specific
  1. Parthasarathi Bhattacharyya1,
  2. Dipanjan Saha2,
  3. Mintu Paul2,
  4. Dhiman Ganguly3,
  5. Biswarup Mukherjee4,
  6. Sushmita Roy Chowdhury5,
  7. Sourav RoyChoudhury6,
  8. Pawan Agarwal5,
  9. Indranil Halder7,
  10. Debanu Ghosh Roy8 and
  11. Shuvanan Ray9
  1. 1Pulmonology, Institute of Pulmocare and Research, DG-8, Action area 1, New Town, Kolkata, India
  2. 2Pulmonology, Institute of Pulmocare and Research, New Town, India
  3. 3Pulmonology, Institute of Pulmocare and Research, Kolkata, India
  4. 4Associate Prof, Cardiology, NRS Medical College, Kolkata, India
  5. 5Consultant Pulmonologist, Apollo Hospital, Kolkata, India
  6. 6Institute of Reproductive Medicine, Salt lake, Kolkata, Kolkata, India
  7. 7Pulmonologist, JNM Hospital, Kalyani, Nadia, India
  8. 8Consultant Cardiologists, Peerless Hospital, Kolkata, India
  9. 9Consultant Cardiologist, Fortes Hospital Anandapur, Kolkata, West Bengal, India
  1. Correspondence to Dr Parthasarathi Bhattacharyya; parthachest{at}


Background A simple and efficient exercise test possible in a small space is welcome to supplement 6 min walk test (6MWT) that demands a 100 feet corridor to perform.

Methods The proposed two chair test (2CT) makes a person to sit and move five times between two chairs placed face to face at 5 feet apart and note the changes in pulse-rate (PR) and arterial oxygen saturation (SpO2) at every 10 s for 2 min after that. Comparison of the post-exercise measurements (PR and SpO2) with a repeat performance in same patients was done for reproducibility and doing the same after 6MWT and 2CT in another set of patients was meant for for acceptability. The statistical analysis was made on moment to moment change, mean maximal difference and mean cumulative difference for the measurements using p value, z-score, r value and principal component analysis (PCA).

Findings A total of 40 and 60 volunteers were included for testing reproducibility and acceptability. On both the sets, the difference in most of comparisons between the measured variable (PR and SpO2) showed the p values remaining insignificant (>0.05), and z-score being <1 SD of the corresponding other and the correlation coefficients (r) remaining excellent (>0.9). Furthermore, the PCA shows complete overlapping. The post-exercise changes did not corelate the walking distance in 6MWT.

Interpretation The proposed 2CT demands small space and appears reproducible and comparable with 6MWT in terms of its post-exercise impact on PR and SpO2. This novel test also appears more of cardiopulmonary reserve specific.

  • exercise

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  • Contributors All authors (PB, DS, MP, DG, BM, SushmitaRC, SouravRC, PA, IH, DGR, SR) contributed to planning, conduct, reporting, conception and design, analysis and interpretation of data for this manuscript.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent for publication Not required.

  • Ethics approval The study was approved by the Institutional Ethics Committee (DCGI approved IRB (IEC) ECR/159/Inst/WB/2013/RR-16 issued under Rule 122DD of the Drugs and Cosmetics Rules 1945 dated 21 February 2017). The recruitment was done from outpatient department of the institute following procurement of a proper written consent.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data availability statement All data relevant to the study are included in the article or uploaded as supplementary information.