Provided are a method for strengthening blood vessels with extreme ease and a compression and decompression control system used in implementing said method. A compression and decompression control system (1) is provided with belts twined around a specific portion of a user's limbs and configured so as to apply a compression force to the specific portion, and a control device for controlling the compression force applied to the specific portions by the belts. The control device controls the compression force applied by the belts so as to alternate repetition between a compression operation for applying a predetermined compression force to the specific portions and a decompression operation for entirely removing the compression force applied to the specific portions by the compression operation. The repetition of the compression operation and decompression operation increases the nitric oxide produced by the vascular endothelial cells of the user's blood vessels, thereby strengthening the blood vessels.本發明提供一種非常容易地實現血管強化之方法及於實施該方法時使用之加洩壓控制系統。本發明之加洩壓控制系統1包含：皮帶，其係以捲繞在使用者之四肢之特定部分而對特定部分賦予加壓力之方式構成；及控制裝置，其係進行藉由皮帶對特定部分所賦予之加壓力之控制。控制裝置係以交替地反覆進行對特定部分賦予特定之加壓力之加壓動作、及完全去除藉由加壓動作對特定部分所賦予之加壓力之洩壓動作之方式，進行藉由皮帶所賦予之加壓力之控制。藉由該等加壓動作及洩壓動作之反覆進行，使自使用者之血管之血管內皮細胞所產生之一氧化氮增加，藉此強化血管。
