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S118 Vol. 52 No. 5 Supplement MEDICINE & SCIENCE IN SPORTS & EXERCISE® B-09 Thematic Poster - Aging intervention (REALPA). Participants completed a DXA using a Hologic Horizon A and 3D body imaging using a Fit3D to estimate whole-body percentage fat. Paired Wednesday, May 27, 2020, 1:00 PM - 3:00 PM t-test were performed to assess mean differences between the two methodologies. Room: CC-2007 Linear regression models were used to determine the association between the two methodologies. Finally, Bland-Altman plots were used to assess level of agreement between the two methodologies. 586 Chair: Loretta DiPietro, FACSM. The George Washington RESULTS: The mean percentage body fat measured by Fit3D was significantly lower University School of Public Health and Health Services, than DXA (34±6% vs. 38±8%, p < 0.01). There was a strong positive correlation Washington, DC. between the percentages body fat measured by the Fit3D and DXA methods (r = 0.72, P = 0.001). The mean difference (limits of agreement) between the Fit3D vs. DXA for (No relevant relationships reported) percentage body fat was -3.8% (-14.5%, 6.7%). Finally, the Bland-Altman analysis revealed that the Fit3D over estimates percentage fat at lower percentages and under estimates 587 Board #1 May 27 1:00 PM - 3:00 PM percentage fat at high percentages. Arterial Stiffness And Cardiorespiratory Fitness In CONCLUSION: Although the percentage body fat measured by the Fit3D was highly correlated with those measured by DXA (criterion), the Fit3D tended to produce lower Adults With And Without Down Syndrome: An Age-and percentage body fats than the DXA. The presence of measurement bias also suggests Sex-matched Study that the Fit3D measurements may not be interchangeable with those obtained from Guillermo R. Oviedo1, Casimiro Javierre2, María Carbó-Carreté2, DXA in older adults. Future, research is necessary to optimize the validity of the Fit3D Nauris Tamulevicius3, Myriam Guerra-Balic1. 1FPCEE- to estimates of percentage body fat in older adults. Blanquerna (URL), Barcelona, Spain. 2University of Barcelona, This study was supported by the NIH 5R21AG058181-02. Barcelona, Spain. 3University of Tampa, Tampa, FL. Email: [email protected] 589 Board #3 May 27 1:00 PM - 3:00 PM (No relevant relationships reported) Relative Intensity-associated Cadence (steps/min) Thresholds In 61-85 Year Olds, The Cadence-adults INTRODUCTION: There are gaps in our knowledge about differences in arterial Study stiffness (AS) and cardiorespiratory fitness (CRF) in adults with and without Down Cayla McAvoy1, Christopher Moore2, Elroy Aguiar3, Marcos syndrome (DS). 4 5 4 PURPOSE: To describe and compare AS and CRF in adults with DS versus adults Amalbert-Birriel , Tiago Barreira , Stuart Chipkin , Scott 6 4 4 7 without DS. Ducharme , Zachary Gould , Colleen Chase , John Schuna, Jr. , 4 1 1 METHODS: Fourteen adults with DS (27±5 yrs) and 14 adults without DS (27±5 yrs) John Staudenmayer , Catrine Tudor-Locke, FACSM . University 2 participated in this study. An inform consent and a health screening questionnaire was of North Carolina - Charlotte, Charlotte, NC. University of completed by each participant and/or legal guardian. After familiarization, participants North Carolina, Chapel Hill, NC. 3University of Alabama, rested lying for 5-10 minutes before the measurements were taken. Brachial and Tuscaloosa, AL. 4University of Massachusetts - Amherst, central systolic and diastolic blood pressure (BSP; BDP; CSP; CDP), central Amherst, MA. 5Syracuse University, Syracuse, NY. 6California augmented pressure (AP), augmentation index (AIx), AIx normalized at 75 beats/min State University Long Beach, Long Beach, CA. 7Oregon State (AIx@75) and AS (carotid-femoral pulse wave velocity (cfPWV)) were measured by University, Corvalis, OR. (Sponsor: Catrine Tudor-Locke, WEDNESDAY, MAY 27, 2020 27, MAY WEDNESDAY, using the SphygmoCor Xcel device (SphygmoCor XCEL, AtCor Medical). To assess FACSM) the CRF, all participants performed a maximal treadmill test. Respiratory gas-exchange Email: [email protected] was measured breath-by-breath with an automatic gas analysis system (Metasys TR- (No relevant relationships reported) plus, Brainware SA, La Valette, France). RESULTS: Non-DS participants were taller and had a lower BMI than the DS group (all p < .05). The CRF of the DS group was lower than the non-DS group (VO peak = A cadence of 100 steps/min has been associated with absolutely-defined moderate 2 intensity (3 metabolic equivalents [METs; where 1 MET = 3.5 mLO /kg]) in young 29.4±6.3 vs. 51.5±11.3 ml/kg/min; p < .001). Non-significant differences were found 2 for BSP/BDP (DS = 116.31 ± 10.9/68.4 ± 9.3 vs. Non-DS = 123.43 ± 8.8/71.6 ± 6.6 and middle-aged adults. However, less is known about how cadence corresponds with mmHg; all p > .050); CSP/CDP (DS = 103.6 ± 8.5/61.1 ± 9.3 vs Non-DS = 107.0 ± relative intensity indicators, especially in older adults. PURPOSE: To investigate 7.6/71.6 ± 6.6 mmHg; all p > .050) and cfPWV (DS = 5.5 ± .6 vs. Non-DS= 5.8 ± .7 cadence thresholds associated with the lower thresholds of relatively-defined indicators m/sec; p = .191). The AP (DS = 6.4 ± 2.7 vs Non-DS = 1.8 ± 3.2 mmHg; p = .002); of moderate intensity provided in the 2011 ACSM Position Stand (i.e., 40-59% of heart AIx (DS = 18.1 ± 6.3 vs Non-DS = 4.9 ± 10.3; p = .001) and the AIx@75 (DS = 12.3 ± rate reserve [%HRR], 64-76% of maximum heart rate [%HRmax], and a Borg scale 8.8 vs Non-DS= -1.6 ± 11.7; p = .002) were significantly higher in the DS group. rating of perceived exertion [RPE] of 12-13) in healthy older adults. METHODS: Ninety-eight older adults (mean [SD]; age = 72.6 [7.0] years, BMI = 25.9 [3.5] kg/ CONCLUSIONS: Despite having lower CRF and higher BMI, adults with DS 2 presented similar values of central and peripheral blood pressure than the Non-DS m ) completed a progressive treadmill walking protocol consisting of 5-minute bouts group. Nevertheless, the DS group showed higher AP, AIx and AIx@75 values, separated by 2-min rests increasing from 0.5 to 6.0 mph in 0.5 mph increments. The which may be due to a higher aortic wave reflection and arterial stiffness.Partially protocol concluded following the bout during which the participants naturally selected supported by: MINECO (DEP2017-86862-C2-1-R) & FPCEE Blanquerna (APR- to jog or run, reached 75% age-predicted HRmax, or reported a Borg scale RPE >13. FPCEE19/20). Cadence was calculated by dividing directly observed step counts by bout duration (5 min). Heart rate (HR) was measured using a chest-worn Polar HR monitor, and HR was averaged over the final 2-min of each bout. HRmax was estimated using the 588 Board #2 May 27 1:00 PM - 3:00 PM standard equation of 220 – age. Intensity indicators were analyzed using Receiver Evaluation Of 3D Body Imaging To Estimate Operating Characteristic (ROC) curves and optimal cadence thresholds associated Percentage Body Fat In Older Adults with moderate intensity were determined using Youden’s Index. RESULTS: The cadence threshold associated with 40% HRR was 103 steps/min (sensitivity = 78%, James E. Stampley1, Samantha Kennedy2, Matthew C. Scott1, specificity = 75%, area under the ROC curve [AUC] = 0.83), and that associated with Brett Davis1, Heather Quiriarte1, Neil Johannsen1, Steven B. 2 2 1 64% HRmax was 104 step/min (sensitivity = 66%, specificity = 75%,AUC = 0.77). Heymsfield , Frank Greenway , Guillaume Spielmann , Brian A. Additionally, an RPE ≥12 was associated with a cadence threshold of 101 steps/ 1 1 Irving, FACSM . Louisiana State University, Baton Rouge, LA. min (sensitivity = 63%, specificity = 73%, AUC = 0.79). CONCLUSION: Cadence 2 Pennington Biomedical Research Center, Baton Rouge, LA. thresholds of 100 - 104 steps/min were associated with relative indicators of moderate Email: [email protected] intensity in ostensibly healthy older adults. These results are consistent with the (No relevant relationships reported) commonly reported heuristic (i.e., practical, rounded, evidence-based) threshold of 100 steps/min associated with absolutely-defined moderate intensity walking in healthy Aging is often associated with adverse changes in body composition that contribute adults. to the development of age-related cardiometabolic and geriatric disorders. Although Supported by NIH/NIA Grant 5R01AG049024 Dual Energy X-ray Absorptiometry (DXA) remains the gold-standard for assessing body composition, 3D body imaging is emerging as cost-effective, noninvasive, user- friendly alternative. However, the validity of 3D body imaging to assess percentage body fat in older adults is unknown. PURPOSE: This study examined the association between percentage body fat estimated by 3D body imaging vs. DXA (criterion) in inactive older adults. METHODS: The present analyses included data from 17 (12F, 5M and 13 White, 4 Black) older (X±SD; 71±4) adults that were participating in an ongoing exercise ACSM May 26 – May 30, 2020 San Francisco, California Official Journal of the American College of Sports Medicine Vol. 52 No. 5 Supplement S119 590 Board #4 May 27 1:00 PM - 3:00 PM 593 Board #7 May 27 1:00 PM - 3:00 PM Abstract Withdrawn Reference Standards For Cardiorespiratory Fitness In Overweight/obese Sedentary Adults 45-69 Years Of Age 591 Board #5 May 27 1:00 PM - 3:00 PM Megan A. Reaves, Kelsey N. Ball, Cris A. Slentz, Johanna L. Relationship Between Fitness Age And Face Age Johnson, Leanna M. Ross, William E. Kraus, FACSM. Duke Amongst An Older Adult Population Univ., Durham, NC. (Sponsor: William E. Kraus, FACSM) Email: [email protected] MaryBlake Williams. University of North Carolina Wilmington, (No relevant relationships reported) Wilmington, NC. (Sponsor: Athanasios Jamurtas, FACSM) Email: [email protected] Purpose In order to establish standards for cardiorespiratory fitness (CRF; peakVO ), (No relevant relationships reported) 2 peak heart rate (HR) and peak oxygen pulse (O2-pulse, a surrogate for stroke volume), we collated percentile data from maximal exercise testing from a sample of sedentary, PURPOSE: To determine the relationship between Fitness Age and Face Age amongst overweight and obese adults in North Carolina.