Low Energy Availability and Hypertension in Division I HBCU Athletes

SPECIFIC AIMS: The International Olympic Committee on Sports Nutrition (IOCSN) recognized low energy availability (LEA), defined as inadequate calorie intake relative to energy expenditure. LEA may be particularly important cardiovascular disease (CVD) risk among minority athlete populations, especially those exposed to poor Social Determinants of Health (SDOH). This includes Black NCAA Division I collegiate athletes (BD1As), who make up 21% of the Division I population and have a 5x higher risk of sudden cardiac death compared to white athletes. Many of the SDOH indicators are alleviated as a Division I athlete (food is available, education support staff, economic stability, etc.). However, many BD1As come from areas described above and have limited awareness of nutritional factors that impact their health. Our pilot data indicate that BD1As with LEA, were over seven times (OR = 7.2) more likely to have hypertension. Further work is required to identify the mechanisms linking LEA to CVD. However, unraveling the mechanism's two gaps in the literature should be addressed: (i) establish whether the association between LEA and CVD risk is measurable; and (ii) determine whether the association between LEA and CVD is modifiable. Filling these gaps will make it possible to identify at-risk athletes and to prescribe strategies to restore energy balance (LEA) and/or directly decrease CVD risk.

Our long-term goal is to develop a practical, scalable, and effective non-pharmacological intervention to decrease LEA as a way to mitigate CVD risk in BD1As. To support this goal, the overall objective of this proposal is to robustly measure the strength of the association between LEA and HBP risk (in a larger cohort) and determine whether SDOH moderates this association. The investigators hypothesize that those identified as LEA will significantly increase CVD risk and therefore propose two specific aims. Aim 1 will test the hypothesis that LEA is positively associated with cardio-femoral pulse wave velocity (cfPWV), a measure of aortic arterial stiffness and the gold-standard biomarker of vascular aging. Aim 2 will test the hypothesis that LEA and cfPWV is moderated by SDOH. While SDOH research among BD1As does not exist, AAs are more likely to be deficient in fruits, vegetables while southern regions consume larger quantities of added fats, fried foods, processed meats, and sugar-sweetened beverages known to negatively impact cardiovascular health.

Completion of this work will help mitigate the empirical understanding that BD1As are \>7x more likely to experience HBP and 5x more likely to experience sudden cardiac death.

The proposed longitudinal observational study will recruit a cohort of \>120 BD1As aged 18-25 years recruited from various sports that include an equitable male/female population from a large HBCU. Participants will be assessed twice, \~4 months apart contingent on the beginning and end of their respective competitive season. For each assessment, traditional (nutrition) and novel (pulse wave velocity) CVD risk biomarkers will be measured, then questionnaires will collect information on SDOH: (i) built environment/food security (e.g. accessibility to food); (ii) health literacy (e.g.: ability to find/understand, use health related information); (iii) sport nutrition knowledge (e.g. knowledge of energy and nutrients); (iv) discrimination (e.g.: social/community context).

Aim 1. Determine the strength of the association between LEA and increased cfPWV. The strength of the association using a general linear model the investigators hypothesize that LEA will be strongly associated with cfPWV increase across the competitive season. Measuring cfPWV evaluates the velocity of the pulse wave or forward pressure transmitted between the carotid and femoral arteries. Decreased compliance of the aortic artery increases the velocity of the pulse wave and is known as arterial stiffness. Arterial stiffness is significantly associated with CVD risk and all cause death. cfPWV is known as the gold standard to evaluate arterial stiffness. The investigators predict that LEA will increase cfPWV by \>1 m/s increasing CVD risk by 14%.

Aim 2. Determine if the association between LEA and cfPWV is moderated by SDOH. The 4 SDOH variables will be added as covariates to the Aim 1 model independently and then in a multivariable model to test the strength of association between variables. Questionnaires will evaluate information related to: (i) built environment/food security by accessing published public demographic information/geomapping; (ii) health literacy skills instrument short form; (iii) sport nutrition knowledge using the athlete diet index; (iv) discrimination with the everyday discrimination scale. Three of the domains are shown to significantly affect health outcomes in AAs while poor sport nutrition knowledge is highly related to eating disorders and physiological dysfunction. The investigators predict that each SDOH will be a significant effect moderator to the LEA/cfPWV association.

Impact. PWV is a highly sensitive and continuous measure of vascular aging and the gold-stand non-invasive biomarker of CVD risk that has never been applied to BD1As. The final product will be an evidence-based reduction intervention to target LEA related CVD risk. Several factors increase the likelihood of high impact: established relationship with college athlete sample pool, and applicability to the larger athletic population, and our multi-disciplinary team and novel approach.

• Social Determinants of Health (SDOH) [Time frame: Enrollment to the second time point will not exceed 26 weeks. Testing once within the competitive season and once outside the competitive season (off season).]
• Health Literacy [Time frame: Enrollment to the second time point will not exceed 26 weeks. Testing once within the competitive season and once outside the competitive season (off season).]
• Sport Nutrition Knowledge [Time frame: Enrollment to the second time point will not exceed 26 weeks. Testing once within the competitive season and once outside the competitive season (off season).]
• Discrimination [Time frame: Enrollment to the second time point will not exceed 26 weeks. Testing once within the competitive season and once outside the competitive season (off season).]