Make sure the valve is not sticky. If the valve is blocked then you may see erroneous results. The spikes can also be a result of erratic breathing technique or evidence that you are struggling with the current settings causing erratic breathing.
Vanessa 20th Dec 2023 How do I clean my Shaker Deluxe & Medic Plus/ Wellness Plus Device? Read More FAQs | Shaker FAQs
Vanessa 12th Oct 2023 What are the differences between POWERbreathe and other respiratory devices? POWERbreathe offers the widest range of scientifically proven Inspiratory Muscle Training (IMT) devices, to cater for individual needs and budgets. Our […] Read More FAQs | General Questions