Cardiol Res

Cardiology Research, ISSN 1923-2829 print, 1923-2837 online, Open Access

Article copyright, the authors; Journal compilation copyright, Cardiol Res and Elmer Press Inc

Journal website https://cr.elmerpub.com

Case Report

Volume 16, Number 4, August 2025, pages 380-384

Safety and Sufficient Cardiac Rehabilitation With a Wearable Activity Tracker in a Patient With Acute Myocardial Infarction and Residual Stenosis

Figures

Figure 1. Coronary angiography. Representative results of coronary angiography are shown. Red circle showed 99% stenosis in in the posterior descending artery of the left circumflex artery (a) and showed 75% stenosis in proximal left anterior descending artery (b).

Figure 2. Illustration of the system using iAide2-W for outpatient CR. The system using iAide2-W for outpatient CR is illustrated. iAide2-W measures the patient’s physical data and the transmitter (iAide2-GV) sends the data to a specialized information cloud by telemetry. Medical staff then instructs the patient according to the data. CR: cardiac rehabilitation.

Figure 3. Representative biological information using iAide2-W. Representative 1 day biological information is shown. (a) Pulse rate (blue dot) and body surface temperature (red bar), (b) steps, and (c) METS in the day are shown. METS: metabolic equivalents.

Table

**Table 1.** Changes of Body Weight and Exercise Tolerance After 5 Months of CR
	Pre-CR	Post-CR
AT: anaerobic threshold; CPX: cardiopulmonary exercise test; CR: cardiac rehabilitation; METS: metabolic equivalents; Post-CR: the time point when patient finished cardiac rehabilitation for 5 months; Pre-CR: the time point when patient discharged; RER: respiratory gas exchange ratio; VCO₂: carbon dioxide output; VO₂: oxygen intake.
Body weight, kg	70.1	65.2
Body mass index, kg/m²	24.2	22.7
CPX
AT VO₂, mL/min/kg	875	927
AT VCO₂, mL/min	1027	992
AT RER	1.17	1.07
AT VO₂/wt, mL/min/kg	12.5	14.2
AT VO₂/wt, % predict	84	95
AT METS	3.6	4.1
Peak VO₂, mL/min/kg	1173	1330
Peak VCO₂, mL/min	1611	1754
Peak RER	1.37	1.32
Peak VO₂/wt, mL/min/kg	16.7	20.4
Peak VO₂/wt, % predict	68	83
Peak METS	4.8	5.8