The purpose of this work was to demonstrate the physical and metabolic alterations induced by mechanical damage on 'Dwarf-Prata' banana fruits kept under low temperature (15 °C and 89 % of RH). A split plots in time assay within a randomized complete block design with three replications was used, constituted of control and four mechanical injuries: cut, abrasion, impact and compression, with samplings along time. Evaluated characteristics were: percentage of accumulated weight loss, daily rate of weight loss, electrolyte leakage of the damaged peel region, soluble sugars and starch, respiration, ethylene production and enzymatic activity of polyphenol oxidase (PPO) and peroxidase (POD). The percentage of accumulated weight loss, the daily rate of weight loss, respiration and ethylene production were determined daily on duplicate samples, consisting of three fruits. Electrolyte leakage, soluble sugar levels and starch and the PPO and POD enzymes activities were determined at 1, 3, 5, 8 and 11 days after the mechanical injuries treatments. The results show that all fruits subjected to mechanical injury increase weight loss (%), electrolyte leakage (%) and PPO average activity, also showing accelerated peel color evolution rate and anticipated climacteric peak, compared to control. The damage caused by abrasion caused higher accumulated weight loss (%). The starch conversion to soluble sugars in the pulp was affected by impact damage. The impact and compression damages anticipated climacteric ethylene peak and, consequently, fruit ripening. The impact damage greatly increased PPO and POD activities.