After functional activities, the most appropriate ice massage treatment time for infrapatellar tendonitis is:

The duration of ice massage for infrapatellar tendonitis after functional activities is appropriately set at 5-10 minutes. This timeframe is effective because it allows for adequate cooling of the tissue without causing any adverse effects such as frostbite or overcooling, which can lead to increased discomfort or delayed recovery.

During the ice massage, the primary goals are to reduce inflammation and pain while enhancing recovery. A treatment duration of 5-10 minutes typically provides sufficient cooling to the tissue without compromising surface tissue integrity. It also aligns with the recommendation that ice applications should be long enough to achieve therapeutic benefits without excessive exposure.

Other timeframes, like 3-5 minutes, may not be adequate for achieving the desired analgesic effect and reducing inflammation, and longer durations, such as 10-15 minutes or 15-20 minutes, could risk causing adverse responses while providing diminishing returns in therapeutic outcomes. Therefore, the selected duration of 5-10 minutes is both practical and effective for managing infrapatellar tendonitis post-activity.