New research from Parks Associates shows smartwatch sales will reach almost 18 million units worldwide in 2014 and 121 million in 2018. Furthermore, the number of connected digital trackers sold worldwide rose from 6.6 million in 2012 to 13.6 million in 2013 and will double again in 2014 to exceed 22 million.

By Parks Associates' estimates, connected trackers will account for 52% of all digital fitness tracker unit sales in 2014 and reach 81% by 2018 (66 million units).

Industry leaders will discuss the wearables market at the upcoming Connected Health Summit, a two-day digital health industry networking conference from Sept 4-5 in San Diego. Keynote speakers include Ascension Health, Humana Wellness, Kaiser Permanente, Optum, Qualcomm Life, and Walgreens. Press passes are available by request and include access to materials.

If you'd like to talk with an analyst or speaker, or if you're looking for specific digital health data, contact Holly Sprague.