Vanderbilt University Medical Center
The purpose of this study is to detail the precise temporal changes in the APR that occur in response to exercise in order to determine the types of exercise that confer maximal reparative fibrinolysis. Published research and preliminary studies conducted in our lab suggest that different types of exercise will preferentially activate fibrinolysis over coagulation, thereby promoting improved global tissue health \[8\]. As such, measuring markers of the APR in healthy individuals 1) at rest, 2) walking (light intensity exercise), 3) running (moderate intensity exercise), and 4) following endurance running (a marathon) will allow us to establish a baseline for the temporal changes in the APR that avoid activation of the procoagulant survival phase while maximizing the repair phase. Specific aims 1. To measure the acute phase response fibrinolysis, plasminogen consumption, and inflammatory profiles of healthy individuals before and after graded exercise (at rest, light intensity, medium intensity) and after prolonged exercise at medium intensity as defined by changes in fibrinolysis, plasminogen consumption, and inflammatory response. 2. To track the APR through modulated exercise in order to determine the type of exercise that enhances physiologic benefit and limits harm.
Injury, ranging from a paper cut that barely splits the skin to a high-speed motor vehicle accident that rips through muscle and bone, causes a disruption of tissue compartments. This breach of compartments disposes tissue to four principle problems: 1) bleeding, 2) susceptibility to infection, 3) hypoxia, and 4) tissue dysfunction. The acute phase response (APR) is the physiologic system that resolves these four problems of injury. It is divided into two temporally distinct phases: survival and repair. The survival phase utilizes coagulation and inflammation to temporarily seal off breached c…
Arm 1: 20-minute graded exercise Inclusion criteria * Healthy individuals (male or female) aged 18-29 * Regular participation (at least 2 times per week) in moderate intensity exercise * BMI between 18.5 and 30.0 Exclusion criteria * Pre-existing health conditions or injuries that may limit the ability to safely participate in exercise * Acute disease process such as an infection, broken bone, or asthma attack * Chronic or recent use (within the last 10 days) of any anticoagulant medication or NSAID * Pregnant women * Recent inpatient admission within the last six months * History of smokin…
Study arm 1 (Graded Exercise) participants will complete either 20 minutes of mild or moderate intensity at 2 different study visits. The third study visit will consist of 20 minutes of sitting.
Study arm 2 (Marathon participation) participants will take part in a marathon. On the day of the marathon prior to start, the participant will be seated for 10 minutes prior to measuring their baseline heart rate. A 4.5 mL blood sample will be collected prior to initiation of exercise. Immediately after completion of the marathon, a 4.5 mL blood draw will be completed. Additional 4.5 mL blood draws will be taken at 1 and 2 days post-marathon to measure to length of time required to return to baseline coagulation, fibrinolysis, and inflammation following the prolonged, intense exercise.