Please assess the completion status of the following clinical trial:

Trial Title: Role of Endorphins in Perception of Dyspnea With Resistive Loading in Chronic Obstructive Pulmonary Disease (COPD)

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: CROSSOVER
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Male or female patient 50 years of age or older;~* A diagnosis of COPD defined by American Thoracic Society-European Respiratory Society criteria~* Current or former smoker with a smoking history of greater than or equal to 10 pack-years;~* A post-bronchodilator forced expiratory volume in one second (FEV1) greater than or equal to 30% predicted and less than or equal to 80% predicted; AND~* A post-bronchodilator FEV1/forced vital capacity ratio less than 70%; and clinically stable COPD.~Exclusion Criteria:~* Any patient who has a concomitant disease that might interfere with study procedures or evaluation;~* Inability to perform resistive breathing maneuvers; OR~* Any current use of a narcotic medication.

- Gender: ALL
- Minimum Age: 50 Years
- Maximum Age: 90 Years
- Healthy Volunteers: f

Study Arms:
- naloxone (Type: EXPERIMENTAL): None
- normal saline (Type: PLACEBO_COMPARATOR): None

Based on this trial design, predict the completion outcome and termination type (if applicable).