Final answer:
Overactivity or tightness of the chest muscles can lead to angina, which is chest pain caused by lack of oxygen to the heart muscle. This can be associated with coronary heart disease or exacerbated by forced breathing during physical activities or stress.
Step-by-step explanation:
Overactivity or tightness of the chest muscles can result in a condition known as angina, which is chest pain or pressure that occurs when heart muscle cells do not receive adequate blood flow, leading to a lack of oxygen (ischemia). Symptoms of angina may include pain in the back, neck, shoulders, or jaw, along with shortness of breath, sweating, or nausea. Furthermore, conditions like coronary heart disease, where there's a buildup of plaque within the coronary arteries, may manifest as angina during times of stress or physical activity. Additionally, respiratory conditions such as asthma can cause chest tightness and difficulty breathing. During forced breathing, or hyperpnea, which occurs during exercise or when actively manipulating breathing, the accessory muscles of the neck and abdomen contract to aid in breathing, but overactivity can lead to discomfort or exacerbate conditions like angina.