The proper technique to lifting weights doesn't just revolve around form. Although it's crucial to do an exercise correctly, especially to avoid injury, you must also aware of your breathing. Improper breathing can disrupt the flow of oxygen through the body, which can lead to undesirable and sometimes dangerous side effects.
Breathing
With weights, you should always exhale while lifting and inhale while returning the weight to its original position. Even when lifting heavier objects and your inclination is to hold your breath, breathe out during the lift and then in as you lower the weight. Holding your breath isn't adding any strength to your muscles. In fact, your muscles need more oxygen when taxed during physical activities.
Fainting
Fainting is often caused by some type of disruption in the blood supply to the brain. When the brain is deprived of blood, even for a short time, it's not getting enough oxygen, which can result in you passing out. When you hold your breath while lifting weights, the momentary lack of oxygen can disrupt the flow of this nutrient to the brain and you may lose consciousness.
Prevention
Normally, you will experience symptoms prior to a fainting spell. Lightheadedness and dizziness are two of the most common, but some people experience nausea, vertigo, blurred vision or hearing disruptions. When you do suffer from one or more of these symptoms while lifting weights, stop what you're doing immediately. If you're not already sitting down, take a seat and place your head between your knees, advises the Mayo Clinic. Breathe normally, remaining in this position until the faintness passes. When you feel better, bring your head up slowly and return to the activity at hand, but make sure to breathe properly during the rest of your workout.
Blood Pressure
Holding your breath while lifting weights can also adversely affect your heart rate and blood pressure. Lifting weight and holding your breath can cause your blood pressure to spike. This is especially problematic for individuals with high blood pressure. The increased pressure in the blood vessels can sometimes damage the arterial walls. This shouldn't, however, dissuade you from strength training, as it can have long-term benefits on your blood pressure.
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