Sports Sciences Commons^™

The Impact Of Power Training On Balance And Visual Feedback Removal, Juliana Bouton

Juliana Bouton

Relationship Between Concentric Velocities At Varying Intensity In The Back Squat Using A Wireless Inertial Sensor, Kevin M. Carroll, Kimitake Sato, George K. Beckham, N. Travis Triplett, Cameron V. Griggs, Michael H. Stone

Michael H. Stone

Objectives: The purpose of this study was to examine the relationship of velocities in the back squat between one repetition maximum (1RM) and submaximally loaded repetition maximum (RM) conditions, specifically in regard to what has been described as the minimal velocity threshold (MVT). The MVT describes a minimum concentric velocity that an individual must reach or surpass in order to successfully complete a repetition. Design: To test the presence of a MVT, participants were tested for 1RM and RM back squat ability. The mean concentric veloci ties (MCV) of the last successful repetition of each condition were then compared. Methods: …

Cell Free Dna As A Marker Of Training Status In Weightlifters, Jeremy A. Gentles, William G. Hornsby, Christine L. Coniglio, Andy R. Dotterweich, Jon A. Miller, Charles A. Stuart, Michael H. Stone

Jeremy A. Gentles

The purpose of this investigation was to elucidate the changes in cf-DNA as it relates to fluctuations in resistance training workloads and intensities. The relationship between cell free DNA (cf-DNA), C-reactive protein (CRP), creatine kinase (CK), testosterone (T), cortisol (C), testosterone-cortisol ratio (T:C), body mass and body composition were also examined. Eight weightlifters (5 males and 3 females, age = 25 ± 3.5 yr, body mass = 88.3 ± 22.7 kg, height = 173.8 ±8.4 cm) volunteered to participate in this study. Venous blood samples, body mass and body composition were taken six times, each corresponding to the end of …

Increases In Variation Of Barbell Kinematics Are Observed With Increasing Intensity In A Graded Back Squat Test, Kevin M. Carroll, Kimitake Sato, Caleb D. Bazyler, N. Travis Triplett, Michael H. Stone

Caleb D. Bazyler

The purpose of the current study was two-fold: (1) To examine the variation in velocity and power with increasing intensity in the back squat among subjects; and (2) To explore individual subject characteristics as possible explanations for variations of velocity in the back squat. Fourteen recreationally trained male subjects with experience in the back squat agreed to participate in the study (age = 25.0 ± 2.6 years, height = 178.9 ± 8.1 cm, body mass = 88.2 ± 15.8 kg). One-repetition maximums (1RM) were performed for each subject on force platforms with four linear position transducers attached to the barbell. …

Cell Free Dna As A Marker Of Training Status In Weightlifters, Jeremy A. Gentles, William G. Hornsby, Christine L. Coniglio, Andy R. Dotterweich, Jon A. Miller, Charles A. Stuart, Michael H. Stone

Andy R. Dotterweich

The purpose of this investigation was to elucidate the changes in cf-DNA as it relates to fluctuations in resistance training workloads and intensities. The relationship between cell free DNA (cf-DNA), C-reactive protein (CRP), creatine kinase (CK), testosterone (T), cortisol (C), testosterone-cortisol ratio (T:C), body mass and body composition were also examined. Eight weightlifters (5 males and 3 females, age = 25 ± 3.5 yr, body mass = 88.3 ± 22.7 kg, height = 173.8 ±8.4 cm) volunteered to participate in this study. Venous blood samples, body mass and body composition were taken six times, each corresponding to the end of …

External Kinetics Of The Kettlebell Snatch In Amateur Lifters, James A Ross, Justin W L Keogh, Cameron J Wilson, Christian Lorenzen

Justin Keogh

BACKGROUND:

Kettlebell lifting has gained increased popularity as both a form of resistance training and as a sport, despite the paucity of literature validating its use as a training tool. Kettlebell sport requires participants to complete the kettlebell snatch continuously over prolonged periods of time. Kettlebell sport and weightlifting involve similar exercises, however, their traditional uses suggest they are better suited to training different fitness qualities. This study examined the three-dimensional ground reaction force (GRF) and force applied to the kettlebell over a 6 min kettlebell snatch set in 12 kettlebell-trained males.

METHODS:

During this set, VICON was used to …

Examining Evidence Based Resistance Plus Balance Training In Community-Dwelling Older Adults With Complex Health Care Needs: Trial Protocol For The Muscling Up Against Disability Project., Justin W L Keogh, Tim Henwood, Paul Gardiner, Anthony Tuckett, Brent Hodgkinson, Kevin Rouse

Justin Keogh

Progressive resistance plus balance training (PRBT) has been demonstrated as effective in reducing later life physical disability, falls risk and poor health, even among those with complex health care needs. However, few studies have examined the influence of PRBT on health service utilisation, cognitive wellbeing and training modality acceptance or undertaken a cost benefit analysis. This project will investigate the broad scope benefits of PRBT participation among community-dwelling older Australians receiving Government supported aged care packages for their complex health care needs. Using a modified stepped-wedge design, 248 community-dwelling adults 65 years and older with some level of government support …

The Acute Effects Of Moderately Loaded Concentric-Only Quarter Squats On Vertical Jump Performance, Aaron Crum, Naoki Kawamori, Michael Stone, Guy Haff

Greg Haff

2012-Limited research exists examining the effect of moderately loaded conditioning activities that are employed as part of a strength-power potentiating complex (SPPC). Additionally, no studies to date have explored the effects of using a concentric-only quarter back squat protocol as part of an SPPC. Therefore, the purpose of this study was to examine the effects of a moderately loaded (50-65% of 1RM) concentric-only quarter back squat protocol on the occurrence of potentiation effects at various time points. Twenty men who could quarter back squat a minimum of 2.4 times their body mass (3.7 ±: 0.7 kg-per body mass) participated in …

Digit Force Control In Older Adults: Benefits Of Resistance-Training?, Justin W.L. Keogh

Justin Keogh

This paper seeks to review the effect on digit force control of: 1) the ageing process; and 2) the resistance-training in older adults. Significant age-related decreases in finger-pinch force control were observed in many but not all studies. Those that didn't report age-related differences involved bi-digit finger-pinch tasks requiring the production of constant forces only. This suggests that the age-related decline in force control becomes more pronounced the more challenging the force production task. While three studies reported that resistance-training improved older adults' digit force control capabilities, it is unclear if these improvements would occur in tasks that: 1) require …