Which therapeutic technique might be unsuitable for clients with certain cardiovascular conditions?

Deep tissue massage involves the application of more intense pressure and manipulation of deeper layers of muscle and connective tissue. This technique can elevate heart rate and blood pressure due to its vigorous nature, which might not be suitable for clients who have specific cardiovascular conditions, such as hypertension or heart disease. It's important for practitioners to assess the individual's health status and potential risks associated with deeper manipulation, as this could exacerbate existing conditions or lead to complications.

In contrast, gentle effleurage, hot stone therapy, and Swedish massage typically utilize lighter pressure and more soothing techniques, making them generally safer options for clients with cardiovascular issues. These methods focus on relaxation, blood circulation, and gentle muscle manipulation, which can be more beneficial and less risky for those with certain health concerns. Therefore, deep tissue massage is the technique that warrants caution and may not be appropriate for all clients with cardiovascular conditions.