MEASURES | MEASURE DESCRIPTION | MEASURE TIME FRAME | Insomnia Severity Index (ISI): "change" is being assessed | To report the perceived severity of difficulties falling asleep, difficulties maintaining sleep and early morning awakenings, as well as the degree of dissatisfaction with current sleep, the degree to which sleep difficulties interfere with daytime functioning, the degree to which the deterioration of functioning related to the sleep problem is noticeable by others, and the level of distress or worry caused by the sleep difficulties.
The total score is interpreted as follows: the absence of insomnia (0-7); sub-threshold insomnia (8-14); moderate insomnia (15-21); and severe insomnia (22-28). | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
Chronotype: "change" is being assessed | One hears about 'morning' and 'evening' types of people with 5 response categories. | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
Health-related quality of life will be assessed using the Medical Outcomes Study 36-Item: "change" is being assessed Short-Form Health Survey (SF-36) | A reliable and valid generic index of perceived health status for cancer patients and used on the previous study for patients undergoing scheduled colorectal surgery. 36-item patient-reported questionnaire that covers eight health domains: physical functioning (10 items), bodily pain (2 items), role limitations due to physical health problems (4 items), role limitations due to personal or emotional problems (4 items), emotional well-being (5 items), social functioning (2 items), energy/fatigue (4 items), and general health perceptions (5 items). Scores for each domain range from 0 to 100, with a higher score defining a more favorable health state. | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
The World Health Organization Disability Assessment Schedule (WHODAS 2.0): "change" is being assessed | 12 items used to measures disability due to health conditions including diseases, illnesses, injuries, mental or emotional problems, and problems with alcohol or drugs.
The sum score for global disability therefore ranges from 0 (no disability) to 48 (complete disability). | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
Patient-Generated Subjective Global Assessment (PG-SGA): "change" is being assessed | Validated for oncologic patients, it comprises 4 scored domains: recent weight loss, food intake, symptoms, and activities and functions. PG-SGA Short Form is a patient-reported instrument for the assessment of nutrition status in patients with cancer. The PG-SGA Short Form numerical scoring range from 0 (no problems) to 36 (worst problem). | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
The oxygen peak during cardiopulmonary exercise testing (CPET): "change" is being assessed | CPET has a growing role in major abdominal surgery to guide decision-making by clinicians and to evaluate the consequences of neo-adjuvant therapies and prehabilitation programs.
The term 'peak VO2' is used as a synonym for VO2 max throughout this text. Peak VO2 is considered abnormal when below 85% of the predicted value. | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
Anaerobic threshold (AT) measured during cardiopulmonary exercise testing (CPET): "change" is being assessed | The VO2 value measured in the first ventilatory threshold (VT1) or anaerobic threshold (AT) is determined by the nonlinear increase of pulmonary ventilation (VE) in relation to VO2. The normal mean AT values expected for adults is around 40% to 65% of peak VO2. | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
Pulmonary ventilation measured during cardiopulmonary exercise testing (CPET): "change" is being assessed | Pulmonary ventilation (VE): Ventilation increases continuously during progressive effort on CPET and undergoes additional increases influenced by the anaerobic metabolism resulting from the accumulation of lactic acid, well defined as the first and second ventilatory thresholds. Periodic (or oscillatory) ventilation is defined as the resting oscillatory pattern that persists in ≥ 60% of the effort with an amplitude of ≥ 15% as compared to mean resting values. | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
CO2 production: "change" is being assessed | CO2 production measured during cardiopulmonary exercise testing (CPET) | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
O2 consumption: "change" is being assessed | O2 consumption measured during cardiopulmonary exercise testing (CPET) | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
Respiratory coefficient measured during cardiopulmonary exercise testing (CPET): "change" is being assessed | Respiratory coefficient or respiratory exchange ratio (R): expresses the ratio between CO2 production and O2 consumption (VCO2/VO2). It is currently the best non-invasive indicator of maximal or quasi-maximal exercise intensity. Values above 1.0 can reflect intense exercise, but those ≥ 1.10 are those searched on CPET, and have been accepted as a parameter of exhaustion or quasi-exhaustion. | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
Muscle strength Handgrip strength will be measured with the Jamar hydraulicdynamometer, in kg: "change" is being assessed | Maximal strength will be recorded, according to standardized procedures. Isokinetic leg strength will be measured with a Biodex on the dominant side.
Loss of muscle strength was defined as < 30kg (men) and < 20 kg (women). | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
Height: "change" is being assessed | Height with a ruler on the wall measured in cm | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |
Weight: "change" is being assessed | Bodyweight will be measured by a digital scale by the Seca mBCA machine in kg | At the baseline, it will be repeated the week of the surgery and at 4 and 8 weeks after the surgery. |