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Why chronic stress decreases your performance

26 March 2025

All of us want optimal performance in our lives. Whether it’s lifting that Personal Best (PB), having energy throughout the whole day, or being successful in that board room. No matter how you define performance in your life, stress can play a large role in derailing your performance goals if certain things are not addressed.

Our bodies are amazing, but they have limits!

They are designed to take on all different forms of stressors: Lifestyle like financial, relationships, work, children and family: Physical like exercise and labour: Environmental like pollution, weather changes: Emotional like losing a pet or a family member and relationship troubles.

This stress will affect everything – our muscles, cells, nerves, lymph, blood, hormones, sleep cycle, circadian rhythm, metabolism, thinking, and much more. 

When the body can take on a stressor and reset or restore itself physically, mentally and emotionally, we call that ‘Recovery’.

However, the body is only capable of functioning at a high-performance level in all parts of the body when it can restore itself from that stress. When we load the system/body with stress and keep adding more stress, the system becomes overwhelmed and can reach a point where it can no longer recover from that stress optimally.

Let’s put this into perspective on a daily basis. You wake up after having a poor sleep and consume more coffee than usual to get yourself alert and moving. You have a busy and stressful day ahead at work, but you still want to get that high-intensity class in before the end of the day.

The body relates to this as STRESS + STRESS + STRESS + STRESS.

This is how most people live in today’s hectic and fast-moving world. And this is when the body needs what is called a “circuit breaker”. If there is no break in this stress as it accumulates and it becomes a daily cycle (chronic), the body cannot recover or reset fully and may lead to:

  • Significant decrease in performance due to dehydration (muscles can’t move as well as they need to and may lead to injury)
  • Significant dip in performance due to lower nutrient delivery to the cells and toxin removal from the cells (a chronically stressed system reduces blood flow to and from extremities)
  • Cortisol cycle can be affected and result in decreased production of testosterone and oestrogen (the hormones we need to drive strength and muscle gains)
  • A change to the cortisol cycle can affect sleep cycle, leaving the body tired and fatigued and affecting any level of performance
  • Adding more stress without recovery will only amplify these effects on the body

Let’s look a little closer at Cortisol and our bodies:

Cortisol is often referred to as the stress hormone. It is a complicated hormone and has its own circadian rhythm that in turn affects the body’s circadian rhythm including sleep, digestion, and general health. When our bodies receive stress, the adrenal glands will produce cortisol to help offset or manage that stress. This was originally a system in our body to recognise danger and help us escape from that danger.

In a healthy, low-stressed individual, cortisol’s normal rhythm is to rise in the morning to get us ready and alert to take on the day. It peaks around midday, then drops off towards the evening allowing us to sleep and for the body to focus on digestion, healing and recovery. However, when we are exposed to many stressors in our day like a fight with a spouse, finances and work, cortisol will also be released to offset these stressors. This creates spikes in cortisol and if prolonged or chronic, it will directly affect testosterone and oestrogen, digestion, blood flow – and therefore our sleep, healing, and overall health.

Reducing stressors or helping the body manage different stressors (and not triggering excess cortisol production) is important to both longevity and performance.

Some easy tweaks you can make to ensure your performance does not decrease through a stressful environment: 

  • Listen to your body. When you notice a change in sleep, caffeine intake, fatigue or stress levels, adjust accordingly

     

  • Start your mornings with hydration first before reaching for coffee
  • Find ways to help the body offset and recover from the stressors like contrast therapy (hot and cold), any form of breath work that is not too aggressive (box breathing or slow and controlled nose breathing)

     

  • Avoid any more stressors – even that workout may be too much when your system is overloaded

     

  • Low heart rate protocols – walking rather than running, light loads and slower movements for strength

     

  • Foam roller, muscle release techniques, whole body vibration (Power Plate), and any way to help push and move fluid through the body (remove toxins)

    Our body can take on and mitigate stress. The better we do this, the better our resilience. When the stressors become chronic and there is no integration of recovery protocols, the body will struggle to reset and restore from that stress, which will significantly affect your performance in all aspects of life.