By Susan L. Jackson in ProHealth.

One of the identifying characteristics and key symptoms of ME/CFS (myalgic encephalomyelitis / chronic fatigue syndrome) is an intolerance to even mild exertion, known as Post-Exertional Malaise or PEM. In simple terms, this means that when people with ME/CFS engage in activity – even just walking to the bathroom or making a simple meal – they experience a sudden worsening of all chronic fatigue syndrome symptoms (usually hours or days after the exertion), often aptly called a “crash” by patients. Fortunately, there are ways to quantify your limits and use a heart rate monitor to stay within those limits, thus greatly reducing post-exertional crashes.

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