Recent work have shown that low load, high-repetitive single limb resistance training, if compared to a control, can increase limb muscle function and functional exercise capacity in patients with chronic obstructive pulmonary disease (COPD) while avoiding the occurrence of limiting exertional symptoms. However, no comparison to another exercise regimen have been performed. In addition neither the intramuscular nor the mechanism of this exercise regimen have been investigated and represents the aim of the proposed project. We will in a prospective, assessor-blind; block randomized controlled, parallel-group trial compare single-limb to two-limb low load, high-repetitive resistance training in patients with severe and very severe COPD The research hypothesizes are: * that single-limb low-load high-repetitive resistance training will provide larger gain in the 6-min walking distance than two-limb low-load high- repetitive resistance training in patients with severe to very severe (stage III-IV) COPD. * that eight weeks of single limb training should also be associated with larger physiological (increased muscle endurance, less muscle fatigue and deoxygenation) and structural (muscle protein synthesis, fiber-type distribution and capillarization) muscle adaptations to training, lower cardio- respiratory demand, as well a greater increase in health-related quality of life in comparison to two-limbs simultaneous training. We will also compare the groups at baseline to investigate the acute effects and mechanisms of single-limb to two-limb low load, high-repetitive resistance training, a comparison that also will include healthy matched controls. The research hypothesizes are: * that involving a large muscle mass during exercise (e.g., two-limb low load, high-repetition resistance training) compared to involving a small muscle mass during training (e.g., single limb low load, high-repetition resistance training) would lead to larger restraints on the cardiorespiratory system in patients with severe to very severe COPD. Conversely, single limb interventions should produce less dyspnea and more muscle deoxygenation and fatigue than two-limb simultaneous exercise while healthy controls will be able to perform both legs/arms exercise without a central constraint, and no negative consequences on muscle fatigue or exercise stimulus.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
50
Low load, high-repetitive resistance training. * single limb at a time (e.g., one arm or one leg) * elastic bands * 8 weeks * 3 times/week, * each session 60 minutes * seven resistance exercises: Latissimus row, leg curl, elbow flexion, chestpress, plantar flexion, shoulder flexion and knee extension * maximal number of repetitions (RM) \* 3 sets in each exercise.
Low load, high-repetitive resistance training. * two limbs at a time (e.g., both arms or both legs) * elastic bands * 8 weeks * 3 times/week, * each session 60 minutes * seven resistance exercises: Latissimus row, leg curl, elbow flexion, chestpress, plantar flexion, shoulder flexion and knee extension * maximal number of repetitions (RM) \* 3 sets in each exercise.
Institut universitaire de cardiologie et de pneumologie de Québec (IUCPQ)
Québec, Quebec, Canada
Centre de recherche de l'IUCPQ
Québec, Canada
Walking capacity (distance [meters])
Meters walked on the 6- minute walk test. The walking course will be 30 meters in length and the patients will be instructed in accordance to standardized guidelines to walk as far as possible in 6 minutes. One practice test will be performed to minimize risk of learning effect. The highest walking distance of the two 6-min walks will be chosen as baseline value.
Time frame: Baseline (week 0), 8 weeks
Unsupported upper extremity endurance capacity (time [seconds])
Endurance time (seconds) on the Unsupported Upper Limb Exercise test (UULEX) will be used to measure unsupported endurance capacity in the upper extremity. Participants will hold a plastic bar (0.2 kg), at shoulder width and will be asked to raise it from hip to the UULEX eight level chart for one minute at each level with a cadence of 30 movements per minute. If a patient reaches the highest level, the plastic bar will be replaced by a heavier one every minute. There are five different weights of the bar (0.2, 0.5, 1, 1.5, 2 Kg) and the patient will continue on the highest level until symptom limitation.
Time frame: Baseline (week 0), 8 weeks
Isokinetic limb muscle function (Endurance [total work], strength [peak torque])
Isokinetic limb muscle function during one-arm shoulder flexion, one-leg knee extension and two-leg knee extension will be assessed. The subjects are informed to flex their arm or extend their leg(s) 25 consecutive times using maximal effort at each repetition during the concentric phase and to rest during the eccentric phase of the movement. Two different aspects of isokinetic muscle function will be measured. Peak torque from the highest contraction will be used for maximal strength and the total work generated from all contractions will be used for limb muscle endurance. The tests will be performed at an angular velocity of 60°• s-1,
Time frame: Baseline (week 0), 8 weeks
Ventilatory response
Respiratory response during all elastic band exercises (1: one-arm shoulder flexion, biceps flexion, chest press and latissimus row 2: two-arm shoulder flexion, biceps flexion, chest press and latissimus row 3: one-leg knee extension, plantar flexion and leg curl 4: two-leg knee extension, plantar flexion and leg curl) will be determined using a portable gas analysis system (Oxycon Mobile, Viasys Healthcare, Jaeger, Germany. Minute ventilation (VE) oxygen uptake (VO2), carbon dioxide excretion (VCO2,), heart rate (HR), respiratory exchange ratio (RER) and pulsed oxygen saturation (SpO2) will be collected
Time frame: Baseline (week 0), 8 weeks
Cardiac output
Arterial blood pressures and cardiac output will be non-invasively measured by a finger photoplethysmography device (BMEYE, Nexfin HD, Academic Medical Center, Amsterdam, The Netherlands) during all elastic band exercises detailed above.
Time frame: Week 0 and week 8
Muscle deoxygenation
Changes of deoxyhemoglobin/myoglobin concentrations will be non-invasively measured by near-infrared spectroscopy of vastus lateralis muscle. Obtained during all elastic band exercises detailed above
Time frame: Baseline (week 0), week 8
Dyspnea (Rating [0-10])
Magnitude of dyspnea after each exercise and test will be measured by the Borg CR 10 scale
Time frame: Baseline (week 0), 8 weeks
Limb muscle fatigue (Rating [0-10])
Magnitude of limb muscle fatigue after each exercise and test will be measured by the Borg CR 10 scale
Time frame: Baseline (week 0), 8 weeks
Isometric muscle strength (maximum voluntary isometric contraction [MVIC], and supramaximal twitch tension (TW) and muscle fatigue
Directly before and after all elastic band exercises (1: one-arm shoulder flexion, 2: two-arm shoulder flexion, 3: one-leg knee extension, 4: two-leg knee extension) generated force of both MVIC and TW will be measured by an isometric force gauge while participants will be in a standardized positioning. The occurrence of quadriceps (knee extension) or deltoid (shoulder flexion) fatigue induced by the exercise regimens will be quantified by measuring the fall in both MVIC and TW 15 after the elastic band resistance exercises.
Time frame: Baseline (week 0), 8 weeks
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