Cardiovascular diseases (CVD) are a group of illnesses that include coronary heart disease, cerebrovascular disease, congenital heart disease, and deep vein thrombosis. CVD is the leading cause of mortality worldwide, representing 31% of deaths. In Spain, CVD caused 24% of all deaths in 2020. Major surgery is often chosen as the treatment of choice for CVD. The concept of fast-track rehabilitation after surgery appeared in the 1970s. Participation in these exercise-based prehabilitation programs may decrease postoperative complications and length of hospital stay.

The purpose of the present study is to evaluate whether the implementation of an additional resistance training (RT) prehabilitation protocol within a cardiac exercise-based prehabilitation can reduce ICU length of stay, postoperative complications, and hospital length of stay (LOS). Additionally, the secondary objective is to determine whether a program that includes RT in addition to respiratory and aerobic training can have better effects on ventilatory variables.

This study follows the protocol of a prospective, parallel, non-randomized clinical trial. Ninety-six adult patients diagnosed with valvular pathology and who have been scheduled for surgery will be included. The control group will be treated with ventilatory and strengthening of respiratory muscles, as well as aerobic exercise. The experimental group, in addition, will receive RT targeting peripheral muscles. Variables such as hospital stay, quality of life, respiratory values, and exercise capacity will be evaluated. Quantitative variables will be analyzed using a t-test or ANOVA, or Mann-Whitney test if the distribution is non-parametric.

Inclusion Criteria:

• adult patients diagnosed with valvular pathology who have been admitted as candidates for cardiac surgery for the first time, and who have been scheduled for surgery

Exclusion Criteria:

• stage 4 or 5 renal failure, low ejection fraction, Euroscore greater than 15 (Nashef et al., 2012) , non-ST-segment elevation acute coronary syndrome (NSTEACS), coronary artery disease, or need for urgent intervention

None of the evaluators or caregivers will know the group assignment of each participant. The person responsible for analyzing the data will only see on the data sheet whether they belong to group 1 or group 0, but they will not know which group each of the values is assigned to.