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35 results on '"Boyer, William R."'

19. Assessing Energy Level as a Marker of Aerobic Exercise Readiness: A Pilot Investigation

Author

STROHACKER, KELLEY, BOYER, WILLIAM R., SMITHERMAN, KAYLA N., CORNELIUS, EMILY, and FAZZINO, DANIEL

Subjects
self-paced exercise, acute treadmill exercise, Core affect, Original Research
Abstract

Energy ratings have been used as a marker of exercise readiness (i.e. pre-exercise physical/mental state indicating ability to perform) within flexible nonlinear periodization (FNLP)-based resistance training interventions. However, empirical data is lacking regarding the utility of this approach for aerobic exercise. The purpose of this study was to examine the ability of pre-exercise energy level to predict affective and behavioral responses to prescribed aerobic exercise. Participants consisted of 19 women and 8 men (N=27, age=20±4 years, estimated maximal oxygen uptake=37±6). Participants performed two 30-min bouts of treadmill exercise under an imposed moderate intensity (70-75% of age-predicted maximal heart rate; %HRmax) condition and a self-selected intensity condition. Pre-exercise energy level was assessed using the Energy Index (EI) score derived from the Profile of Mood States. Feeling Scale (FS) was the dependent variable in the imposed bout and average intensity (%HRmax) was the dependent variable during the self-selected bout. Multiple regression analyses were used to determine if EI predicted mean FS and %HRmax. After controlling for potential confounders, EI significantly predicted mean FS (β=.499, p=.037) during imposed exercise. No significant relationship existed between EI and overall intensity (β =-121, p=.554) during self-selected exercise. While EI predicted in-task core affect it was unrelated to self-selected intensity. It is premature to suggest EI as an optimal predictor of exercise readiness in regards to aerobic exercise for aerobically untrained young adults. More research is needed to determine an evidence-based marker of readiness that can be used for aerobic exercise prescribed within the context of FNLP.

Published
2017

20. Gender Differences in C-Reactive Protein and Muscle Strengthening Activity.

Author

Richardson, Michael R., Johnson, Tammie M., Katzmarzyk, Peter T., Ford, Earl S., Boyer, William R., and Churilla, James R.

Subjects
C-reactive protein, MUSCLE strength, PHYSICAL activity, RESISTANCE training, GENDER differences (Psychology)
Abstract

Background: Few studies have examined the gender differences between C-reactive protein (CRP) and muscle strengthening activity (MSA). Methods: The sample (n = 7533) included U.S. adult (≥20 years of age).participants in the 1999-2004 National Health and Nutrition Examination Survey (NHANES). Created categories of MSA participation included no MSA (referent group), some MSA (≥1 to <2 days/week), and meeting the 2008 Department of Health and Human Services (DHHS) recommendation (>2 days/week). The dependent variable was elevated CRP (>3 to 10 mg/L). Results: Analysis revealed significantly lower odds of having elevated CRP for women reporting some MSA (OR 0.64; 95% Cl 0.44-0.93, P = .0191). Significantly lower odds of men having elevated CRP was observed in those reporting MSA volumes meeting the DHHS recommendation (OR 0.72; 95% Cl 0.59-0.88, P = .0019). Following adjustment for waist circumference (WC) these odds remained significant in men but not women. Conclusions: These results suggest that WC may mediate the associations between MSA and CRP and this relationship may be stronger in women. [ABSTRACT FROM AUTHOR]

Published
2015
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35. The Physical Activity Guidelines and Diabetes-Related Mortality: National Health and Nutrition Examination Survey 1999-2006.

Author

Boyer WR, Brenton M, Ehrlich SF, Churilla JR, and Fitzhugh EC

Abstract

Background: Previous studies have indicated an inverse relationship between aerobic physical activity (PA) and risk of diabetes-related mortality (DRM). However, the contribution of aerobic PA across multiple domains, while also considering the contribution of muscle-strengthening activity (MSA), in reduction of risk for DRM has yet to be examined. Purpose: The aim of this study is to examine the individual and combined associations of aerobic PA and MSA with DRM. Methods: The study sample ( n  = 13,350) included adult (20-79 years of age) participants from the 1999 to 2006 National Health and Nutrition Examination Survey. PA was categorized into 6 categories based around the 2018 PA guidelines: category 1 (inactive), category 2 (insufficient aerobic PA and no MSA), category 3 [active (aerobic) and no MSA], category 4 (no aerobic PA and sufficient MSA), category 5 (insufficient aerobic PA and sufficient MSA), and category 6 (meeting both recommendations). The dependent variable in this study was DRM, which includes those who had diabetes as the primary cause of death as well as those with diabetes listed as an underlying cause of death. Cox proportional hazards models were used for all analyses. Results: Following adjustment for covariates, significant risk reductions for DRM were found only in category 3 (HR = 0.57; 95% confidence interval: 0.37-0.88). Conclusions: Results suggest that meeting the aerobic PA guidelines significantly reduces the risk for DRM. Those meeting versus not meeting the MSA guidelines seem to have no difference in risk for DRM independent of aerobic PA.

Published
2024
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