PMR	Progressive Muscle Relaxation
COPD	Chronic Obstructive Pulmonary Disease
CF	Cystic Fibrosis
COVID-19	Coronavirus Disease 2019
PAH	Pulmonary Arterial Hypertension
FEV1	Forced Expiratory Volume in 1 s
FVC	Forced Vital Capacity
HRV	Heart Rate Variability
EEG	Electroencephalogram
HPA	Hypothalamic–Pituitary–Adrenal axis
SpO2	Peripheral Oxygen Saturation
HADS	Hospital Anxiety and Depression Scale
GHQ-12	General Health Questionnaire-12
PSQI	Pittsburgh Sleep Quality Index
SRSS	Sleep State Self-Rating Scale
STAI	State-Trait Anxiety Inventory
GAD-7	Generalized Anxiety Disorder-7
PHQ-9	Patient Health Questionnaire-9
6MWT	6-Minute Walk Test
CASIS	COPD and Asthma Sleep Impact Scale
CAFS	COPD and Asthma Fatigue Scale
BAI	Beck Anxiety Inventory
ACQ	Asthma Control Questionnaire
AQLQ	Asthma Quality of Life Questionnaire
SGRQ	St. George’s Respiratory Questionnaire
SAS	Self-Rating Anxiety Scale
SDS	Self-Rating Depression Scale
SF-36	Short Form Health Survey
ARAS	Ascending Reticular Activating System
RCT	Randomized Controlled Trial
JBI	Joanna Briggs Institute
PTR	Pulmonary Telerehabilitation
LMRT	Laura Mitchell’s Relaxation Technique
JPRT	Jacobson’s Progressive Relaxation Technique
GDB	Guided Deep Breathing
MBS	Modified Borg Scale
mMRC	Modified Medical Research Council
CI	Confidence Interval
SMD	Standardized Mean Difference