Abstract
Purpose: The study aimed to analyze the effect of chest-expansion exercise studies on chest expansion, respiratory function, and functional activity over the past 8 years (2015-2022).
 Methods: Previous studies were electronically searched using the PubMed, PEDro, KISS, and RISS4U databases. A total of five studies were selected according to the PRISMA guidelines, and the PEDro scale was used for the qualitative analysis.
 Results: Five studies met the criteria. Two studies scored 6 of 10 and three scored 5. Four studies had an intervention of 20 and 30 min, each at a frequency of 4-5 times per week, for a total of 4-8 weeks, except for one study that performed 20 min of intervention at a time, which demonstrated an immediate effect. The results indicated that chest-expansion exercises effectively improved chest expansion, respiratory function, and functional activity.
 Conclusion: Chest-expansion exercises exert positive effects on chest expansion, respiratory function, and functional activity.
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