But there will still be many financial institutions with significantly impaired balance sheets as the value of their mortgage-backed securities declines sharply over the next year.

The report speculates that, although a player may have been passed fit, a concussion could have a longer-term effect on an athlete's neuromuscular control resulting in, for instance, impaired balance.

Symptoms are varied and pervasive, ranging from vision problems and spasms to impaired balance and memory.

Such impairments include fatigue, weakness, hypertonicity, low exercise tolerance, impaired balance, ataxia and tremor.

This may also be expressed as impaired coordination, impaired balance and dizziness.