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https://www.readbyqxmd.com/read/29212552/validity-and-reliability-of-simple-measurement-device-to-assess-the-velocity-of-the-barbell-during-squats
#1
Silvio Lorenzetti, Thomas Lamparter, Fabian Lüthy
OBJECTIVES: The velocity of a barbell can provide important insights on the performance of athletes during strength training. The aim of this work was to assess the validity and reliably of four simple measurement devices that were compared to 3D motion capture measurements during squatting. Nine participants were assessed when performing 2 × 5 traditional squats with a weight of 70% of the 1 repetition maximum and ballistic squats with a weight of 25 kg. Simultaneously, data was recorded from three linear position transducers (T-FORCE, Tendo Power and GymAware), an accelerometer based system (Myotest) and a 3D motion capture system (Vicon) as the Gold Standard...
December 6, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29210895/characteristics-of-upper-limb-pull-power-and-power-endurance-in-japanese-female-wrestlers
#2
Tatsuki Naka, Masaaki Kanno, Shota Shidochi, Kazuhito Sakae, Norihiro Shima
This study aimed at elucidating the characteristics of upper-limb physical strength required by female wrestlers by comparing the pull power, power endurance, and number of repetitions between female wrestlers at world and national levels. The subjects were 20 female wrestlers (8 Olympic- and/or world-class and 12 national-class top-ranking individuals). The subjects assumed a lying prone (face down) position on a bench and pulled a bar from arms length until contact with underside of bench. The weight load was increased in 10-kg steps and the upper-limb pull power was measured for each lift...
November 22, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29112053/concurrent-validity-and-reliability-of-a-linear-positional-transducer-and-an-accelerometer-to-measure-punch-characteristics
#3
Conor Lambert, Belinda R Beck, Benjamin K Weeks
Lambert, C, Beck, BR, and Weeks, BK. Concurrent validity and reliability of a linear positional transducer and an accelerometer to measure punch characteristics. J Strength Cond Res XX(X): 000-000, 2017-Punch speed is an important factor in the sport of boxing, and its measurement has important implications for monitoring training progression and outcomes. The aim of the current study was to establish the concurrent validity and reliability of a linear position transducer and an accelerometer for the quantification of punch characteristics in untrained adults...
November 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28182500/validity-of-various-methods-for-determining-velocity-force-and-power-in-the-back-squat
#4
Harry G Banyard, Ken Nosaka, Kimitake Sato, G Gregory Haff
PURPOSE: This investigation examined the validity of two kinematic systems for assessing mean velocity (MV), peak velocity (PV), mean force (MF), peak force (PF), mean power (MP), and peak power (PP) during the full depth free-weight back squat performed with maximal concentric effort. METHODS: Ten strength-trained men (26.1±3.0 y; 1.81±0.07 m; 82.0±10.6 kg) performed three 1-repetition maximum (1RM) trials on three separate days, encompassing lifts performed at six relative intensities including 20, 40, 60, 80, 90, and 100% of 1RM...
February 9, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/24650275/the-effect-of-an-acute-antioxidant-supplementation-compared-with-placebo-on-performance-and-hormonal-response-during-a-high-volume-resistance-training-session
#5
James Ackerman, Tom Clifford, Lars R McNaughton, David J Bentley
Antioxidant supplementation is known to increase human endogenous antioxidant (AOX) capacity providing a means of blunting exercise induced reactive oxygen species (ROS). The purpose of this study was to compare the effects of a single acute dose of an AOX (vs blinded placebo) on muscle contractile performance and hormonal responses to a single bout of lower limb 'hypertrophic' resistance training (RT). Fifteen resistance trained subjects (age 23 ± 4 years: body mass 86 ± 6 kg) volunteered to participate in the study...
2014: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/21380970/validating-two-systems-for-estimating-force-and-power
#6
COMPARATIVE STUDY
B T Crewther, L P Kilduff, D J Cunningham, C Cook, N Owen, G-Z Yang
This study examined the validity of 2 kinematic systems for estimating force and power during squat jumps. 12 weight-trained males each performed single repetition squat jumps with a 20-kg, 40-kg, 60-kg and 80-kg load on a Kistler portable force plate. A commercial linear position transducer (Gymaware [GYM]) and accelerometer (Myotest® [MYO]) were attached to the bar to assess concentric peak force (PF) and peak power (PP). Across all loads tested, the GYM and MYO estimates of PF and PP were moderately to strongly correlated ( P≤0...
April 2011: International Journal of Sports Medicine
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