Description

This study will utilize a randomized counter balanced cross-over repeated measures design. Participants will complete a total of 13 visits to the Exercise Physiology Intervention and Collaboration (EPIC) lab.

6.2 Procedures of each individual visit: Visit 1 (V1): will consist of informed consent and eligibility screening. Individuals who have provided written informed consent to participate will be screened using the Physical Activity Readiness Questionnaire (PAR-Q+), Medical History Questionnaire (MHQ), and a Caffeine Consumption Questionnaire (CCQ) to determine eligibility to participate in the study. Eligible participants will also be examined by a certified phlebotomist to determine the likelihood of successful venipuncture. Eligible participants will subsequently be randomized in a counter balanced fashion into two treatment groups (n=10/group) corresponding to either Verisperse® Resveratrol (VRES) or Placebo (PLA) using an online randomization tool. Participants will also select their snack choice from a list of pre-approved options. Following this, participants will be scheduled for visit 2 (V2), which will occur at least 24 hours following V1.

Visit 2 (V2): Participants will arrive for V2 in a fasted state (≥8 hours) having abstained from alcohol for at least 12 hours prior. Upon arrival, participants will complete a hydration assessment by urinating into a provided sample cup no more than 4oz. Participants will then provide a venous blood sample to determine baseline systemic concentrations of creatine kinase and C-reactive protein. Next, participants will complete anthropometric assessments of height, weight, and body composition via bioelectrical impendence analysis (BIA). Participants will be asked to remove shoes and all jewelry for BIA. There are no risks or discomfort associated with the bioelectrical impendence analysis. Next, participants will be rested in a quiet, dimly lit laboratory in a semi-recumbent position for 15 minutes before completing the flow-mediated dilation (FMD) assessment. Participants will then be provided with their standardized snack of choice (energy bar) before undergoing familiarization with the active range of motion (AROM), pain pressure threshold (PPT), muscle soreness (MS) perceived recovery scale (PRS), maximal voluntary isometric contraction (MVIC), and vertical jump (VJ) assessments and the isoinertial squat protocol (ISP) (3 sets of 6 repetitions at a resistance of .067kg/mm2). Following the ISP, participants will be familiarized with the online MyFitnessPal application.

Visits 3-5 (V3-V5): Upon arrival for V3-V5, participants will undergo a standardized warm-up identical to V2 before completing additional familiarization with the ISP. All procedures for V3-V5 will be identical. V2-V5 will be separated by at least 24-hours but no more than 72 hours.

Visit 6 (V6): Upon arrival to the lab participants will fill out a sleep quality questionnaire (SQQ), provide a urine sample to assess hydration status, and provide a pre-exercise venous blood sample to establish baseline measures of creatine kinase (CK) and C-reactive protein (CRP). Next, participants will complete PRE ultrasound assessments of muscle thickness (MT) and echo intensity (EI) followed by the FMD assessment. Participants will then be provided with the standardized snack (energy bar) of their choice and complete a standardized warmup identical to V2, before completing PRE assessments of AROM, PPT, MS, PRS, MVIC, and VJ. Participants will then be fitted with a heart rate monitor and complete the ISP followed by a 3-minute cycle-based cool down period, a venous blood sample, and follow-up assessments of MT, EI, AROM, PPT, MS, PRS, MVIC, and VJ immediately post-exercise (IP). MVIC and VJ will be separated by 5 minutes to allow for adequate recovery.

Visits 7-9 (V7-V9): V7-V9 will be identical in nature and will occur 24, 48, and 72 hours following V6, respectively. Upon arrival to the lab for each experimental trial (V7-V9) participants will fill out a sleep quality questionnaire (SQQ), provide a urine sample to assess hydration status, and provide a pre-exercise venous blood sample to establish baseline measures of creatine kinase (CK) and C-reactive protein (CRP). Next, participants will complete ultrasound assessments of muscle thickness (MT) and echo intensity (EI) followed by the FMD assessment. Participants will then complete a standardized warmup identical to V2, before completing assessments of AROM, PPT, MS, PRS, MVIC, and VJ. MVIC and VJ will be separated by 5 minutes to allow for adequate recovery.

Visit 10 (V10): V10 will occur 32 days after V9 and be conducted in an identical fashion to V6.

Visits 11-13 (V11-V13): V11-V13 will occur 24, 48, and 72 hours following V10, respectively. V11-V13 will be conducted in an identical fashion to V7-V9)

Consent and Screening Prior to beginning the study, individuals interested in participating in the study will be asked to report to the EPIC lab to review and sign an informed consent document. Participants who provide consent to participate will then be screened for eligibility via the PAR-Q+, MHQ, and CCQ. Participants will also be asked to fill out a contact form that will record their preferred email and cell phone number.

Hydration Status Assessment Upon arriving to the lab, participants will be given a sample cup to take to the restroom and provide a urine sample, so that hydration may be assessed. After providing a urine sample, a member of the research team will measure urine specific gravity (USG) using a refractometer to ensure participants are euhydrated (1.002-1.025). If dehydrated (>1.025), they will be asked to consume 16 oz of water and be retested after waiting 15 minutes post ingestion. If hyperhydrated (<1.002) their visits will be rescheduled. Hydration status will be checked immediately upon arrival to the laboratory for V2 and each experimental trial (V6-V13). Urine samples will be disposed of according to UCF policy.

Venous Blood Sample Collection Blood samples at V2, PRE-, IP, 24H, 48H, and 72H will be obtained using a 21-gauge, 1¼ inch vacutainer blood collection needle or 23-gauge butterfly needle taken from a superficial forearm vein. A maximum of 2 unsuccessful attempts to insert a needle in one of the participant's arms will be made and, with their permission, a third and final attempt will be made in the opposite arm. Three unsuccessful venipuncture attempts will result in termination of the blood draw. Issues with blood collection devices that prevent the drawing of blood are not grounds for removal from the study and will not affect participants continuation with the remainder of the study. All blood draws will be conducted under aseptic conditions. To minimize the risks, the skin area where the needle is inserted will be cleaned and prepared with a disinfectant alcohol wipe before the needle is inserted. Following the blood draw, the puncture site will be covered with a bandage.

A total of 8mL (slightly less than 2 tsp) of blood will be collected at each time point (V2 & V6-V13) in one 4mL BD Vacutainer™ Serum separation tube (SST) and one 4mL K2EDTA plasma tube (EDTA).

Blood samples collected in the 4mL SST tube will be used to determine serum concentrations of C-reactive protein (CRP) and creatine kinase (CK). Serum tubes will be inverted ten times and allowed to clot at room temperature for 30-minutes prior to centrifugation for 10-minutes at 4000rpm. After centrifugation, serum will be aliquoted and frozen at -80°C within one hour of collection.

Blood samples collected in EDTA tube will be gently inverted ten times and left at room temperature for same day analysis. EDTA whole blood samples will be analyzed directly in-house using an automated hematology analyzer (Sysmex XN-450 Automated Hematology Analyzer) located in the Cellular Exercise Physiology Laboratory (CEPL) in BIO 224, Building 20 (Biological Sciences). Sample analytes will include hematocrit, hemoglobin, mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC), and total (white blood cell and red blood cell) and differential (lymphocyte, monocyte, and granulocyte, platelet) cell counts.

Standardized Warm-up Prior to all performance assessments, participants will be required to complete a dynamic warm-up. Participants will begin by pedaling on a cycle ergometer for 5-minutes at a self-selected pace at a set resistance of 75 watts. Participants will then complete ten body-weight squats, ten body-weight walking lunges, ten dynamic straight leg kicks, and ten dynamic walking quadricep stretches.

Sleep Quality Questionnaire Participants will be asked to fill out a brief 7 question sleep questionnaire consisting of questions pertaining to their sleep and sleep quality within the last 24 hours. Participants will complete the SQQ immediately upon arriving for each experimental trial (V6-V13) Diet and Dietary Log Participants will be asked to maintain two separate 5-day dietary logs using the "MyFitnessPal" application on their own cellular or computer device. Participants will be asked to begin each 5-day log 24 hours before ET1 and ET2 and to maintain the log by tracking all food and beverage consumption to the best of their ability for the 5 days until the completion of the 72H follow up visits (visits 9 & 13, respectively). Additionally, participants will be asked to keep their food and beverage consumption during the two 5-day periods as consistent as possible and to match macronutrient (fats, carbohydrates, and proteins) consumption between the two periods to the best of their ability. Participants refusing to voluntarily report food and beverage consumption will be withdrawn from the study.

Assessments Anthropometric Assessments: During V2, participants will complete anthropometric assessments of height, weight, and body composition. Height and weight will be assessed using a stadiometer and scale (Health-o-meter Professional Patient Weighing Scale, Model 500 KL, Pelstar, Alsip, IL, USA). Body composition will be assessed using bioelectrical impedance analysis (BIA; InBody 770, Biospace Co, Ltd. Seoul, Korea) or bioelectrical impedance spectroscopy analyzer (Sozo; Carlsbad, CA, USA). Participants will be asked to void their bladder, and remove shoes, socks, and all jewelry for this assessment. They will also be asked to be eight hours fasted and well-hydrated as determined by USG analysis. There are no risks or discomforts associated with the BIA analysis.

Flow Mediated Dilation (FMD) Standardization of FMD procedures and protocol will be conducted following established guidelines (40). Prior to testing, subjects will be rested in a quiet, dimly lit laboratory in a semi-recumbent position for 15 minutes. Automated brachial artery sphygmomanometry (IntelliSense® Professional Monitor, OMRON Healthcare Inc., Lake Forest, IL) will be used to measure resting systolic blood pressure (SBP), diastolic blood pressure (DBP) and heart rate (HR) on the left arm. Mean arterial pressure (MAP) will be calculated to determine peripheral vascular resistance using the following equation: {MAP=[0.33×(SBP-DBP)]+DBP}. Brachial artery diameter and blood velocity will be measured by duplex, high-resolution Doppler ultrasound (GE Logiq P9, GE Healthcare, Chicago, IL) using a (5)-MHz linear array transducer. An arm tourniquet cuff with rapid inflation system (Hokanson E20; D.E. Hokanson Inc., Bellevue, WA) will be placed around the right forearm, immediately distal to the antecubital fossa for assessment of reactive hyperemia and brachial artery FMD. Stable imaging of the brachial artery will be accomplished using foam positioning aids and transducer stabilizing clamp.

Brachial artery FMD will be continuously measured and recorded using a 10-minute protocol. Baseline diameter and blood velocity will be recorded for two minutes. The tourniquet cuff will then be inflated to approximately 240 mmHg to occlude the brachial artery for five minutes. Following cuff deflation, recording will continue for three minutes to assess changes in diameter and blood velocity. All ultrasound settings will be kept consistent, and measurement will be completed by the same technician (Mr. Dufner). Scans will be recorded directly from the ultrasound system using commercial video capturing software (Snagit, TechSmith Corp., Michigan, USA) and saved to an online file drive. Offline analyses will be performed using edge-detection and wall-tracking software (FMD Studio, Cardiovascular Suite, Quipu, Pisa). Following data processing, all macroand micro-vascular function parameters will be calculated using a custom visual basic macro in Microsoft Excel (3). FMD will be assessed during V2 and at PRE, 24H, 48H, and 72H during each experimental trial.

Ultrasound Measurement (MT and EI) Rectus femoris (RF), vastus medialis (VM) and vastus lateralis (VL) MT and EI assessments will be taken on the right leg using B-mode ultrasound (GE Logiq, General Electric Medical Systems, Milwaukee, WI, USA) and a linear array probe (L4-12t, 4.2-13.0 MHz, 38.4-mm field of view, GE Healthcare, Milwaukee, WI, USA). All ultrasound measurements will be performed at 12 MHz, gain of 50 dB, depth of 5cm, and Dynamic range of 72. A water-soluble transmission gel will be applied to the skin to enhance acoustic coupling. Three images of each muscle will be captured in the sagittal plane. RF images will be captured at half the distance between the superior border of the patella and the center of the inguinal fold. VM images will be captured between the center of the inguinal fold and 3 inches proximal to the medial epicondyle of the femur. VL images will be captured at half the distance between the greater trochanter and the superior border of the patella. Ultrasound images will be analyzed using ImageJ software (Version 1.53v., National Institutes of Health, Bethesda, MD, USA), according to the procedures described by Girts. Et al. (41). MT and EI will be assessed at PRE, IP, 24H, 48H, and 72H during each experimental trial.

Active Range of Motion (AROM) AROM will be assessed following the standardized warm-up while participants are in a prone position on a padded testing table with their legs fully supported. A handheld goniometer will be used to assess AROM of the right knee. The goniometer will be anchored at the lateral epicondyle of the femur with the stationary arm in line with the greater trochanter of the femur and the movement arm aligned with the lateral malleolus of the ankle. Participants will be instructed to move the knee from maximal full extension throughout the range of motion to maximum full flexion holding each end point for two seconds. The average of two consecutive measurements will be used to determine AROM. AROM will be assessed at PRE, IP, 24H, 48H, and 72H during each experimental trial.

Pain Pressure Threshold PPT will be assessed immediately following the AROM assessment while the participants sat on the end of padded table with their upper legs supported and their lower legs hanging freely. Using a handheld 15kg dolorimeter with a 1 cm rubber tip, pressure will be applied to the RF, VM, and VL at locations identical to that of the ultrasound assessments increasing at a rate of 1 kg/s until participants first report feeling pain, at which point the algometer will be removed from the skin. PPT will be assessed once at each sight before a second measure of PPT at each location is acquired. The algometer value at the onset of pain will be recorded and the average of two measures with will be used to denote PPT. PPT will be assessed at PRE, IP, 24H, 48H, and 72H during each experimental trial.

Perceived Recovery Scale (PRS) PRS will be assessed as a total feeling of recovery in the lower extremities (waist down) and be performed while the participant is standing at a knee angle of 140 degrees immediately prior to MS testing. Participants will be asked to rank their level of recovery on a 100mm VAS ranging from 0 to 100, with 0 being not at all recovered and 100 being very well recovered. PRS will be assessed at PRE, IP, 24H, 48H, and 72H during each experimental trial.

Muscle Soreness (MS) MS will be assessed as a total feeling of soreness in the lower extremities (waist down) and be performed while the participant is standing at a knee angle of 140 degrees immediately prior to MVIC testing. Participants will be asked to rank their level of MS of their entire lower extremities on a 100mm VAS ranging from 0 to 100, with 0 being no pain at all and 100 being the most pain imaginable. MS will be assessed at PRE, IP, 24H, 48H, and 72H during each experimental trial.

Maximal Voluntary Isometric Contraction (MVIC) and Rate of Force development (RFD) MVIC assessments will be completed inside a specialized isometric squat rack and platform with an immovable bar. Bar height for each participant will be set at a height that elicits a participant knee angle of 140 degrees. Bar height will be established during V2 and standardized for all subsequent MVIC assessments. Each MVIC assessment will consist of 3 x 5s maximal isometric contractions. For each contraction, participants will be instructed to drive upwards maximally against the bar by extending their knees and hips for 5s in a manner identical to the movement pattern of a typical high bar back squat. Each contraction will be initiated following a verbal prompt from the researcher and consistent verbal encouragement will be provided for the entire 5s of each contraction. One minute of rest will be provided between each contraction to allow for recovery. The contraction containing the highest peak force will be denoted as the participant's MVIC from which rate of force development (RFD) will be recorded at 0-250ms, dictated by the onset of muscular contraction. MVIC and RFD will be assessed at PRE, IP, 24H, 48H, and 72H during each experimental trial.

Vertical Jump Protocol (VJ) Vertical countermovement jumps will be assessed on the same force plates utilized for the MVIC. Participants will undergo 3 vertical jump trials with 1 minute rest between. Participants will be instructed to jump as high as possible with their hands on their hips. The highest value achieved in the three trials will be used to denote the participant's maximal vertical jump height. VJ will be assessed at PRE, IP, 24H, 48H, and 72H during each experimental trial.

Isoinertial Squat Protocol (ISP) The ISP will be conducted using the Desmotec isoinertial training device (D11 evo, Desmotec, Biella, Italy). During the ISP, participant's force and power output will be measured by the Desmotec device via two underfoot force plates. Participants will be asked to maintain a standing position with their feet at a width identical to that typically used during a traditional back squat, to cross their arms in front of them to their opposite shoulder, and to maintain that position for every ISP assessment. Participants will then be strapped into the desmotec device via the flywheel cable connected to a waist strap according to the manufacturer's instructions. Once properly fastened, cable tension will be set at 15kg using a handheld scale (ROMECH, Paisley, United Kingdom) to ensure consistent cable tautness between participants. The resulting length of each participant's cable will be recorded during V2 and standardized for all subsequent assessments. The ISP will consist of 6 sets of 10 maximal repetitions at an isoinertial resistance of .067kg/mm2. Immediately preceding each set, participants will complete two low effort "free repetitions" to prepare the participant for the rhythm of the impending isoinertial movement. Participants will be instructed to give maximal effort during the concentric (upward) phase of the movement by reaching full knee and hip extension and rocking onto the balls of their feet but to delay their braking force during the eccentric (downward) phase until the last possible moment. A rope affixed to two height adjustable stands will be positioned horizontally behind the participant to provide a reference for the end of the eccentric (downward) phase of the movement at a height that elicits a knee angle of ~90degrees when softly touched by the participant's glutes. Rope height will be established during V2 and standardized for every subsequent ISP. Participants will be instructed to repeat that squat depth for every contraction and give maximal effort throughout the entire duration of each set while being consistently verbally encouraged by the researcher.

Standardized Cool-Down Following the ISP, participants will be required to complete a dynamic cool-down by pedaling on a cycle ergometer for 3-minutes at a self-selected pace at a set resistance of 75 watts.