Clinical trial NCT05185895: Visa-versa! Breaking Instead of Pushing the Pedals-D
Official title: Visa-versa! Breaking Instead of Pushing the Pedals: Eccentric Exercise to Improve Training Performance in Healthy Controls. A Single-center Randomized Controlled Trial
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Healthy (Controls)
Lead sponsor: University of Zurich
Sponsor class: OTHER
First posted: 2022-01-11
Enrollment: 24
Sex: ALL
Minimum age (years): 18
Maximum age (years): 80
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: TREATMENT

Brief summary: Eccentric muscle work is defined as lengthening of a muscle while applying force. It was shown that with eccentric work, muscles are able to perform four times as much power compared to usual concentric work, which results in huge training gain with a highly decreased oxygen demand and thus lower cardiovascular load. Pulmonary hypertension (PH) is a chronic condition associated with significant reduced exercise capacity and increased morbidity and mortality, resulting in reduced quality of life. Physical training has been shown to be beneficial in PH, even in severely limited patients. However, due to cardiopulmonary constraints in PH, training intensities may be very low, so that many patients are physically almost unable to perform exercise on a high enough level to maintain muscle mass. A low body muscle not only feeds the vicious cycle of decreasing exercise capacity, but also has many deleterious metabolic and immunological consequences which further increase disability and decrease quality of life in PH. Thus, eccentric training, which allows to gain muscle mass with a low stress to the cardiopulmonary unit may to be highly beneficial for patients with PH and allied cardiopulmonary disease, such as chronic obstructive pulmonary disease (COPD) and heart failure. Therefore, the objective of the trial is, to compare differences in oxygen uptake (peak VO2 \[l/min\]) and other physiological measures during similar cardiopulmonary exercise test protocols of eccentric- vs. concentric cycling in PH- patients and comparators with or without other cardiopulmonary diseases.

Detailed description: Eccentric muscle work is when a muscle lengthens while applying force. Although eccentric muscle work is part of everyday life, e.g. whilst descending, it is not integrated in modern training protocols and its underlying physiological mechanisms are still incompletely understood. It was shown that muscles are able to perform four times as much power eccentrically compared to common concentric muscle work with a comparably very low oxygen demand and thus cardiovascular load. Thus, eccentric training may be of special interest for patients with cardiopulmonary diseases. Since much higher training intensities are achieved eccentrically, the training increase after a few weeks of eccentric training is huge compared to ordinary concentric training. In addition, it has been observed that these high intensities applied eccentrically lead also to a concentric gain in strength and are therefore transferable to everyday activities. Physical training has been shown to be beneficial in almost every cardiovascular disease, even in severely limited patients. However, training intensities may be very low in some patients with advanced cardiopulmonary disease, so some patients are physically almost unable to perform exercise on a beneficial level. Thus, for this collective, eccentric training may to be a very intriguing option. Patients with pulmonary vascular diseases such as pulmonary arterial and chronic thromboembolic pulmonary hypertension (PH) per definition reveal an elevated pulmonary artery pressure (PAP) along with an increased pulmonary vascular resistance (PVR). However, also other common diseases, such as left heart disease (LHD) or chronic obstructive pulmonary disease (COPD) are often associated with PH. The cardinal symptoms of PH is dyspnea on exertion leading to limited exercise performance, daily activity and quality of life. PH-patients also benefit from structured exercise training, but training intensities might be limited in patients with advanced disease. A few studies have investigated eccentric exercising in cardiopulmonary patients but none in PH. Most of these studies are in patients with coronary heart disease- (CHD) or COPD, including only few participants and often studies did not followed sound methodologies, such as randomized-controlled trial (RCT) protocols However, even in the hitherto limited patients´ investigated, eccentric training was assessed beneficial, feasible and safe.

The physiological cardiopulmonary response to eccentric exercising has not been investigated in patients with PH and the physiological basis to investigate such training opportunities is completely lacking.

The aim of this project is to investigate the cardiopulmonary effects of eccentric exercise in using solid randomized-controlled research protocols in cardiopulmonary diseases with focus on PH in order to provide a basis to the question of whether this promising training method could become established in cardiopulmonary rehabilitation, especially in patients with advanced disease and pulmonary hypertension.

Eligibility criteria: Inclusion Criteria:

* Signed informed consent.
* no cardio respiratory diseases

Exclusion Criteria:

* Severe daytime hypoxemia (pO2 ≤7.3 kPa or \<55 mmHg).
* Other clinically significant concomitant disease states (e.g., renal, hepatic dysfunction, etc.).
* Inability to follow the procedures of the study, e.g. due to language problems, psychological disorder, dementia or confusional state of the subject, neurological or orthopedic problems with inability to ride a bicycle.
* Woman with known pregnancy (Women with known pregnancy will not be allowed into the study. It will however not be searched for early unknown pregnancy in woman of child-bearing potential, as cycling is not contraindicated in early unknown pregnancy stage and we thus do not plan routine pregnancy tests before study entrance in women of childbearing potential).
* Enrolment into another clinical trial with active treatment.

Primary outcomes:
measure: Oxygen uptake (peak VO2 [l/min])
timeFrame: 1 Day
Secondary outcomes:
measure: Respiratory exchange ratio (RER)
timeFrame: 1 day
measure: Breathing equivalent for carbon dioxide
timeFrame: 1 day
measure: Pulmonary end tidal carbon dioxide (PET CO2)
timeFrame: 1 day
measure: Arterial oxygen saturation (SpO2)
timeFrame: 1 day
measure: Borg Scale for dyspnea
timeFrame: 1 day
measure: Borg Scale for leg fatigue
timeFrame: 1 day
measure: Cardiac output
timeFrame: 1 day
measure: Pulmonary Artery Pressure
timeFrame: 1 day
measure: Blood pressure
timeFrame: 1 day
measure: Brain tissue oxygenation
timeFrame: 1 day
measure: Muscle tissue oxygenation
timeFrame: 1 day
measure: Arterial blood gases: PH
timeFrame: 1 day
measure: Arterial blood gases: Partialpressure for oxygen (PaO2)
timeFrame: 1 day
measure: Arterial blood gases: Bicarbonate (HCO3)
timeFrame: 1 day
measure: Arterial blood gases: lactate
timeFrame: 1 day
Other outcomes:
Locations:
city: Zurich
country: Switzerland
facility: Respiratory Clinic, University Hospital of Zurich
Study officials:
References: