Evaluate the Use of Omega-3 Fortified Smoothies to Improve Omega-3 Index and Physical Performance Related Outcomes Among Soldiers

Evidence suggests that mental and physical health are positively related to the omega-3 intake, and studies indicate that supplementation of omega-3 fatty acids may improve muscle recovery and range of motion while decreasing soreness and pain.

Omega-3 fatty acids are an essential part of the diet and are found primarily in marine-based sources of fatty fish including salmon, mackerel, and herring. The Omega-3 Index (O3I) is a reliable method used to measure omega-3 status, more specifically it represents the sum of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), as a percentage of red blood cells. Currently, O3I is the preferred method for assessing omega-3 status given its low biological variability and its ability to be measured in either the fed or fasted state. Generally, the O3I increases with greater consumption of marine-based omega-3; however, the extent varies by individual. Research indicates the general population and Service members alike have a low O3I (~4%) and therefore at risk for poor health and suboptimal physical performance. For optimal health, performance and a decreased risk for cardiovascular disease an O3I of ≥ 8 % is desirable.

The research utilizing the Omega-3 Index as a measure of omega-3 fatty acids began in relation to preventing severe cardiovascular risks. The research has expanded shows that omega-3 fatty acids can reduce triglyceride levels and may serve as an effective treatment option for cardiovascular disease, osteoporosis, psoriasis, and arthritis. Omega-3 fatty acids are thought to inhibit eicosanoids and inflammatory cytokines leading to analgesic effects. Additionally, preliminary studies support a rehabilitative role of omega-3 fatty acids in maintaining muscle mass and minimizing muscle wasting during a prolonged period of limb immobilization (i.e., leg cast). Furthermore, O3I levels have been positively correlated with muscle protein synthesis and enhanced recovery from muscle damaging exercise (i.e. delayed onset muscle soreness), in both athletic and military populations.

Improving Service Members health and maintaining the ability to perform optimally are high priorities. An average O3I of ~4% is concerning. These findings, although not surprising given the lack of foods containing omega-3 fatty acids across military installations, require action. Innovative solutions to provide Service Members with omega-3 fatty acids are needed to achieve health and performance benefits. Therefore, the purpose of this study is to examine whether increasing omega-3 fatty acid intake using a novel fortified food product improves performance and recovery outcomes in Holistic Health and Fitness (H2F) soldiers.

Researchers hypothesize regular consumption (one smoothie per day, five days per week, for eight weeks) of omega-3 fortified smoothies (1600 mg omega-3 per smoothie) will increase O3I to 8% compared to a control group. Researchers also hypothesize improvements in performance markers related to strength, flexibility, aerobic capacity and power as assessed by the Army Combat Fitness Test (ACFT), rate of perceived exertion (RPE), and recovery (a visual analog scale (VAS) for pain) in the intervention group compared to control. Researchers hypothesize the control group will not reach an O3I of 8% and measures of performance and recovery will be statistically lower than in the intervention group.