The Con of Valsalva

Did you know that the Valsalva maneuver can affect your blood pressure? Use of the Valsalva maneuver can cause a drastic drop in blood pressure because the increased intrathoracic pressure collapses the veins. This is why some people may see spots or be dizzy after using this breathing technique. Following the drop in blood pressure, the cardiovascular then overcorrects and shoots blood pressure way up. New lifters and those with blood pressure issues should steer clear of this technique. Instead, opt for the deep breathing technique. Inhale with eccentric contractions and exhale with concentric contractions while contracting the abdominals to increase intraabdominal pressure, protect the spine, and add power behind the lift. 

McArdle, W., Katch, F., & Katch, V. (2015). Exercise physiology: Nutrition, energy, and human performance. Wolters Kluwer.