Other Nutrition Commons^™

Performance Fatigability And Neuromuscular Responses Are Not Joint Angle Specific Following A Sustained Isometric Forearm Flexion Task Anchored To A High Perceptual Intensity In Women, Jocelyn E. Arnett, Robert W. Smith, Tyler J. Neltner, John Paul V. Anders, Dolores G. Ortega, Terry J. Housh, Richard J. Schmidt, Glen O. Johnson

Department of Nutrition and Health Sciences: Faculty Publications

Objectives: To examine the effects of joint angle (JA) on maximal voluntary isometric contractions (MVIC) and neuromuscular responses following a sustained, isometric forearm flexion task anchored to a rating of perceived exertion (RPE) of 8 (RPE=8). Methods: Nine women (age: 20.7±2.9 yrs; height: 168.8±7.2 cm; body mass: 66.3±6.8 kg) performed 2,3s forearm flexion MVICs at JAs of 75°, 100°, and 125° prior to and following a sustained, isometric forearm flexion task anchored to RPE=8 to task failure (torque reduced to zero) at JA100. Electromyographic (EMG) and mechanomyographic (MMG) signals were recorded from the biceps brachii. Results: The …

The Effects Of Anchor Schemes On Performance Fatigability, Neuromuscular Responses And The Perceived Sensations That Contributed To Task Termination, Robert Smith, Terry J. Housh, Jocelyn E. Arnett, John Paul V. Anders, Tyler J. Neltner, Dolores G. Ortega, Richard J. Schmidt, Glen O. Johnson

Department of Nutrition and Health Sciences: Faculty Publications

The present study examined the effect of anchor schemes on the time to task failure (TTF), performance fatigability, neuromuscular responses, and the perceived sensations that contributed to task termination following the sustained, isometric forearm flexion tasks. Eight women completed sustained, isometric forearm flexion tasks anchored to RPE = 8 (RPEFT) and the torque (TRQFT) that corresponded to RPE = 8. The subjects performed pre-test and post-test maximal isometric contractions to quantify performance fatigability and changes in electromyographic amplitude (EMG AMP) and neuromuscular efficiency (NME). In addition, the subjects completed a post-test questionnaire (PTQ) to quantify the contributions of perceived sensations …

Utilizing The Rpe‑Clamp Model To Examine Interactions Among Factors Associated With Perceived Fatigability And Performance Fatigability In Women And Men, Robert W. Smith, Terry J. Housh, Jocelyn E. Arnett, John Paul V. Anders, Tyler J. Neltner, Dolores G. Ortega, Richard J. Schmidt, Glen O. Johnson

Department of Nutrition and Health Sciences: Faculty Publications

Purpose The purpose of the present study was to examine the interactions between perceived fatigability and performance fatigability in women and men by utilizing the RPE-Clamp model to assess the fatigue-induced effects of a sustained, isometric forearm flexion task anchored to RPE = 8 on time to task failure (TTF), torque, and neuromuscular responses.

Methods Twenty adults (10 men and 10 women) performed two, 3 s forearm flexion maximal voluntary isometric contractions (MVICs) followed by a sustained, isometric forearm flexion task anchored to RPE = 8 using the OMNI-RES (0–10) scale at an elbow joint angle of 100°. Electromyographic amplitude …

The Effects Of Surface Composition On 6-Weeks Of Plyometric Training, Cameron D. Addie, Richard S. Farley, Sandra L. Stevens, Halle J. Brandt3, Jocelyn E. Arnett, Jennifer L. Caputo

Department of Nutrition and Health Sciences: Faculty Publications

Background: Plyometric training programs may be performed on a hard surface or a soft surface to target specific training adaptations and enhance jump performance. However, it is unknown how surface compliance impacts jump performance. Objective: To compare changes in horizontal lower body power following a 6-week plyometric training program performed on a soft surface (n = 9) and a hard surface (n = 11). Methods: This was a quasi-experimental study. University students (N = 20; males = 11, females = 9; age: 20.4 ± 3.7 yr; body mass: 68.4 ± 12.5 kg; height 1.7 …

Time Course Of Changes In Torque And Neuromuscular Parameters During A Sustained Isometric Forearm Flexion Task To Fatigue Anchored To A Constant Rating Of Perceived Exertion, Robert W. Smith, Terry J. Housh, John Paul V. Anders, Tyler J. Neltner, Jocelyn E. Arnett, Richard Schmidt, Glen O. Johnson

Department of Nutrition and Health Sciences: Faculty Publications

Objective: This study examined the time course of changes in torque and electromyographic (EMG) and mechanomyographic (MMG) responses during a sustained isometric task anchored to a constant perception of exertion (RPE). Methods: Twelve college-aged men performed an isometric forearm flexion task to failure anchored to RPE=7 (OMNI-RES scale). The amplitude (AMP) and frequency (MPF) of the EMG and MMG signals from the biceps brachii were recorded. Repeated measures ANOVAs were used to examine differences for the normalized (%MVIC) torque and neuromuscular parameters. Results: The time to task failure (TTF) was 678.0±468.1s. Torque decreased significantly (p<0.001, η_p ²=0.774) …

Time Course Of Changes In Neuromuscular Responses At 30% Versus 70% 1 Repetition Maximum During Dynamic Constant External Resistance Leg Extensions To Failure, Cory M. Smith, Terry J. Housh, Ethan C. Hill, Richard J. Schmidt, Glen O. Johnson

Department of Nutrition and Health Sciences: Faculty Publications

The purpose of the current study was to examine the time course of changes in neuromuscular responses from the vastus medialis (VM) during low versus high intensity dynamic constant external resistance (DCER) leg extension muscle actions to failure. Thirteen men performed DCER leg extensions to failure at 30% and 70% 1-repetition maximum (1-RM) as well as 1-RM measurements pretest and posttest. Electromyogaphy and mechanomyographic signals were measured from the VM. There were no differences in neuromuscular responses pretest versus posttest 1-RM. There were timedependent differences between the 30% and 70% 1-RM protocols. The initial phase of the 30% 1- RM …