Exercise Training Using an App on Physical Cardiovascular Function Individuals With Post-covid-19 Syndrome

The 6-minute walk test performed in a 30-meter corridor, measured in meters

The test consists in rise from a chair, carry a weighted backpack, walk 10 meters, climb stairs, move objects between shelves (1 kg each), and return. They perform tasks sequentially, transferring items up and down shelves. The route is retraced, ending by sitting back in the initial chair, measured in seconds

The test consists in rising from a chair as many times as possible within 30 seconds, measured in number of repetitions

The Post-COVID-19 Functional Status Scale assesses limitations following SARS-CoV-2 infection, measured as a score

The Patient Functional Scale allows individuals to identify 3 to 5 important activities they consider themselves unable to perform or are having difficulty with due to their condition, measured in a score

The cortical excitability of the quadriceps motor area will be measured using Motor Evoked Potential results in microvolts (µV) using the Transcranial Magnetic Stimulation equipment model MagPro R20 (MagVenture, Denmark) with the parabolic coil model MMC-140-II, measured in kgf

This scale comprises five items, allowing the patient to select the item that corresponds to how much their dyspnea limits their daily life activities, measured as a score

Comprising eight specific statements about physical fatigue to confirm its presence or absence, measured as a score

The questionnaire evaluate the symptoms of fatigue in different conditions, measured as a score

To assess quality of life, the 12-Item Short-Form Health Survey will be used, consisting of twelve items that evaluate eight different dimensions influencing quality of life, measured as a score

Frailty will be assessed using the Tilburg Frailty Indicator, while sarcopenia will be evaluated through the Sarcopenia Form questionnaire, both measured as a score

Levels of anxiety and depression will be assessed using the Hospital Anxiety and Depression Scale, measured as a score

Assessed using the Numeric Pain Rating Scale, measured as a score

Movement behavior will be quantified through a motion sensor, measured in minutes

Specific questionnaire to assess the most prevalent environmental barriers to physical activity, measured as presence or absence

Adherence to exercise interventions will be obtained with the Adherence Assessment Scale

The clinical resting blood pressure will be assessed using automatic blood pressure monitoring equipment (HEM-7113, OMRON®, Brazil), measured in mmHg

Cardiac autonomic modulation will be assessed through heart rate variability using a heart rate monitor, measured in RR intervals

The measurements of basal blood flow and flow-mediated vasodilation will be obtained through ultrasonography in brachial artery, measured in ml/min or %

Changes in Forced vital capacity, forced expiratory volume in the first second, Peak expiratory flow, forced expiratory flow 25-75% and FEV 1 /FVC ratio

Scale used to assess the individuals' perception of the app's usability in the group submitted to the intervention

The questionnaire will be applied in experimental group to collect information regarding the user's overall experience with the app, such as: general perception, overall experience, main barriers, and key difficulties in using the app.

The focus group will be conducted via video conference with 4 to 10 individuals that participated in experimental group. The guiding questions will aim to understand the user's perception, from usability to effectiveness, including satisfaction and potential improvements to the app.