Life Sciences Commons^™

A Comparison Of Running Economy Across Seven Carbon-Plated Racing Shoes, Dustin P. Joubert, Garrett P. Jones

Faculty Publications

Background: Advancements in running shoe technology, particularly in the Nike Vaporfly, have been shown to improve running economy. Other brands have now also developed new, advanced shoes with a carbon-fiber plate and thicker, new midsole foams. However, none of these new shoes have been compared to the Vaporfly. Therefore, we compared the effects of 7 different carbon-plated shoes and 1 traditional racing shoe on running economy.

Methods: Seven carbon-plated shoes: Hoka-RocketX (HRX), Saucony-Endorphin Pro (SEP), Nike-Alphafly (NAF), Asics-Metaspeed Sky (AMS), Nike-Vaporfly2 (NVF2), New Balance-RC Elite (NBRC), Brooks-Hyperion Elite2 (BHE2), and one traditional shoe: Asics-Hyperspeed (AHS) were tested in 12 male …

Ground Contact Time Imbalances Strongly Related To Impaired Running Economy, Dustin P. Joubert, Nicholas A. Guerra, Eric J. Jones, Erica G. Knowles, Aaron D. Piper

Faculty Publications

Running economy (RE) is defined as the oxygen consumption (VO2) or caloric unit cost required to move at a specific velocity and is an important performance marker. Ground contact time (GCT) has been associated with RE; however, it has not been established how GCT imbalances between feet impact RE. Purpose: Determine the relationship between cadence, GCT, and GCT imbalances and RE. Methods: 11 NCAA Division I distance runners (7 male) completed a graded exercise test on a treadmill to determine lactate threshold (LT) and VO2max. Body composition was also assessed via DEXA. Subjects ran with a heart rate monitor capable …

Comparison Of Post-Activation Potentiating Stimuli On Jump And Sprint Performance, Aaron D. Piper, Dustin P. Joubert, Eric J. Jones, Malcom T. Whitehead

Faculty Publications

Post-activation potentiation (PAP) is a phenomenon characterized by improved muscle performance based on the previous contractile activity of the muscle. The purpose of this study was to determine the effect of different potentiating stimuli on jump and sprint performance in 13 resistance trained, college-aged men and women. After determining back squat 1 repetition max, subjects returned for testing on separate days to complete one of four interventions (dynamic resistance, weighted plyometric, isometric, or control) in a randomized order. A standardized warmup was performed, followed by a baseline countermovement jump (CMJ) and 20m sprint. Following warm-up and baseline measurements, subjects performed …

A Validation Study Of A Noninvasive Lactate Threshold Device, Rebecca M. Mcmorries, Dustin P. Joubert, Eric J. Jones, Mark D. Faries

Faculty Publications

International Journal of Exercise Science 12(2): 221-232, 2019. The lactate threshold is considered a key marker of endurance exercise performance and identification of this threshold is important in writing an exercise training program. Unfortunately, assessment of the lactate threshold has traditionally required venous or capillary blood samples and a specialized meter to assess blood lactate concentrations. Recently, a consumer grade, non-invasive device was developed to determine muscle oxygenation and estimate the lactate threshold. Purpose: The aim of this study was to assess the validity of a noninvasive lactate threshold device (NID) to determine lactate threshold heart rate (LTHR). Methods: Twenty-one …

Using Wireless Pedometers To Measure Children’S Physical Activity: How Reliable Is The Fitbit Zip?, Tingting Xu, Erik Jon Byker, Monica Rae Gonzales

Faculty Publications

The purpose of this study is to examine the reliability of wireless pedometers in measuring elementary school children’s physical activity. Activity measurement using a wireless pedometer Fitbit Zip^TM was compared to activity measurement using Yamax Digi-Walker^TM SW701 for a group of randomly selected 25 children in Grades 3, 4, and 5. Fitbit Zip^TM wireless pedometers were found to have an appropriate degree (Nunnally & Bernstein, 1994) of accuracy and reliability compared to the Yamax Digi-Walker^TM SW701 pedometer. The Fitbit Zip^TM wireless pedometer collected more step counts than the Yamax Digi-Walker^TM SW701 pedometer; however, the …

Feasibility And Acceptability Of An Early Childhood Obesity Prevention Intervention: Results From The Healthy Homes, Healthy Families Pilot Study, Akilah Dulin Keita, Patricia M. Risica, Kelli L. Drenner, Ingrid Adams, Gemma Gorham, Kim M. Gans

Faculty Publications

Background. This study examined the feasibility and acceptability of a home-based early childhood obesity prevention intervention designed to empower low-income racially/ethnically diverse parents to modify their children’s health behaviors. Methods. We used a prospective design with pre-/posttest evaluation of 50 parent-child pairs (children aged 2 to 5 years) to examine potential changes in dietary, physical activity, and sedentary behaviors among children at baseline and four-month follow-up. Results. 39 (78%) parent-child pairs completed evaluation data at 4-month follow-up. Vegetable intake among children significantly increased at follow-up (0.54 cups at 4 months compared to 0.28 cups at baseline, 𝑃 …