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The individualized aerobic training program will be developed according to Karvonem's equation . It will programmed in 3 sessions/week (not in row) during 4 weeks.

Each 50-minutes session will be organized in three phases: warm up, central and back to calm. The heart rate target will be prescribed as follows:

Week 1: heart rate target: 50% of maximum heart rate Week 2: heart rate target: 60% of maximum heart rate Week 3: heart rate target: 70% of maximum heart rate Week 4: heart rate target: 60% of maximum heart rate The aerobic exercise will be carried on a treadmill or in a stationary bicycle, according to the patient's preferences and will be supervised by a physical therapist.

Individualized aerobic training program developed by physical therapist using Karvonem's equation . It will programmed in 3 sessions/week (not in row) during 4 weeks. Each 50-minutes session will be organized in three phases: warm up, central and back to calm. The heart rate target will be prescribed between 50 to 70% of the maximum heart rate and will be carried on a treadmill or in a stationary bicycle.

Preoperative exercise program

Oscar Guevara, MD, MSc

Kelly Chacon, FT

Maria T. Vallejo, Md

Oscar A Guevara, MD MSc

Patients with gastrointestinal cancer often experience physical deconditioning; this could lead to an increased risk of complications, especially when they require major abdominal surgical procedures.

It has been suggested that physical training in the preoperative period could improve their condition, reducing the risk of complications. Although this topic has been investigated, it has not been established yet the best short preoperative aerobic exercise program to enhance the aerobic capacity in patients with gastrointestinal cancer who are going to be to surgical primary management, and consequently, to help patients dealing with the physiological stress involved in a surgical intervention.

Main objective:

To determine the efficacy and safety of a 4 weeks preoperative exercise program in patients with gastrointestinal cancer scheduled for primary surgery.

Materials and methods:

This is a Phase II single arm clinical trial that will include patients between 45 and 70 years, with confirmed gastrointestinal cancer (gastric, hepatic, colon or rectal cancer), without electrocardiographic abnormalities, and scheduled for primary surgery in 4 weeks or more since recruitment

All the enrolled patients will receive a basal aerobic capacity assessment with the 6-minute walk test. Then, two physical therapist will prescribe them a supervised and individualized aerobic training program in 3 sessions per week during 4 weeks. Each session will last 50 minutes and will increase the heart rate target weekly (from 50% to 70% of the maximum heart rate). The aerobic exercise will be carried on a treadmill or in a stationary bicycle.

The post intervention aerobic capacity will be measured at week 3 and 4 with the 6-minute walk test. The main efficacy outcome will be peak oxygen consumption (VO2 peak) and the safety outcomes will be exercise-related adverse events and the program adherence.

This protocol was approved by the Instituto Nacional de Cancerología's Ethical Board

Gastrointestinal - origin cancer is one of the most frequent causes of cancer worldwide ; the primary surgical management is the standard treatment, however, the postoperative complications rate could be up to 35% . Patients with gastrointestinal - origin cancer often experience physical deconditioning; this could lead to an increased risk of complications, especially when they require major abdominal procedures.

It has been suggested that physical training in the preoperative period could improve their condition, reducing the risk of complications. Although this topic has been investigated, it has not been established yet the best short preoperative aerobic exercise program to enhance the aerobic capacity in patients with gastrointestinal cancer who are going to be to surgical primary management, and consequently, to help patients dealing with the physiological stress involved in a surgical intervention.

Main objective:

To determine the efficacy and safety of a 4 weeks preoperative exercise program in patients with gastrointestinal cancer scheduled for primary surgery.

Materials and methods:

This is a Phase II single arm clinical trial that will include patients between 45 and 70 years, with confirmed gastrointestinal cancer (gastric, liver, colon or rectal cancer), scheduled for surgery in 4 weeks or more since recruitment and without electrocardiographic abnormalities.

The patients will be selected from the gastrointestinal unit surgical schedule. The eligible patients will be invited to participate and after their agreement to participate and to do the informed consent process, they will be scheduled to the basal assessment. This aerobic capacity assessment will be done with the 6-minute walk test.

After the basal measurement, two physical therapists will prescribe an individualized aerobic training program in 3 sessions per week during 4 weeks. Each session will last 50 minutes and will be programmed as follows:

* Week 1: heart rate target: 50% of maximum heart rate
* Week 2: heart rate target: 60% of maximum heart rate
* Week 3: heart rate target: 70% of maximum heart rate
* Week 4: heart rate target: 60% of maximum heart rate

The aerobic exercise will be carried on a treadmill or in a stationary bicycle, according to the patient's preferences and will be supervised by a physical therapist.

The post intervention aerobic capacity will be measured at week 3 and 4 with the 6-minute walk test. The main efficacy outcome will be peak oxygen consumption (VO2 peak) and the safety outcomes will be exercise-related adverse events and the program adherence.

This protocol was approved by the Instituto Nacional de Cancerología's Ethical Board.

The individualized aerobic training program will be developed according to Karvonem's equation . It will programmed in 3 sessions/week (not in row) during 4 weeks

Each 50-minutes session will be organized in three phases: warm up, central and back to calm. The heart rate target will be prescribed as follows:

* Week 1: heart rate target: 50% of maximum heart rate
* Week 2: heart rate target: 60% of maximum heart rate
* Week 3: heart rate target: 70% of maximum heart rate
* Week 4: heart rate target: 60% of maximum heart rate

The aerobic exercise will be carried on a treadmill or in a stationary bicycle, according to the patient's preferences and will be supervised by a physical therapist.

The post intervention aerobic capacity will be measured at week 3 and 4 with the 6-minute walk test.

Efficacy and Safety of a Preoperative Aerobic Exercise Program in Patients With Gastrointestinal Cancer.

Efficacy and Safety of a Preoperative Aerobic Exercise Program in Patients With Gastrointestinal Cancer. A Phase II Clinical Trial

IPD will not be shared with other researchers

peak oxygen consumption measured in ml/kg/min using the American College of Sports Medicine's equation

any unexpected reaction secondary to the exercise program. This could be mild (nausea, fall, joint pain, tendinitis) or severe (syncope, fracture, myocardial infarction).

frequency of patients who will complete at least the 3 week program.

peak oxygen consumption measured in ml/kg/min using the American College of Sports

Spots Global Cancer Trial Database for preoperative exercise program