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Brendan R Scott, Katie M Slattery, Dean V Sculley, Catriona Lockhart, Ben J Dascombe
This study assessed whether hypoxia augments anabolic responses to moderate-load resistance exercise. Fourteen trained males performed moderate-load resistance exercise in normoxia (NORM; fraction of inspired oxygen [FIO2] = 21%) and moderate-level hypoxia (MH; FIO2 = 16%). Exercise comprised 3 sets of 10 repetitions of squats and deadlifts at 60% of 1-repetition maximum, with 60 s inter-set rest. Blood lactate (BLa) was quantified after each exercise, while arterial oxygen saturation (SpO2) and heart rate (HR) were assessed following each set...
September 20, 2016: Journal of Strength and Conditioning Research
Justin Kompf, Ognjen Arandjelović
Since it was first observed, and especially so in recent years, the phenomenon of the so-called "sticking point" in resistance training has attracted a substantial amount of sports and exercise science research. Broadly speaking, the sticking point is understood as the position in the range of motion of a lift at which a disproportionately large increase in the difficulty associated with continuing the lift is experienced. Hence the sticking point is inherently the performance bottleneck, and is also associated with an increased chance of exercise form deterioration or breakdown...
September 6, 2016: Sports Medicine
Alberto Mendez-Villanueva, Luis Suarez-Arrones, Gil Rodas, Rodrigo Fernandez-Gonzalo, Per Tesch, Richard Linnehan, Richard Kreider, Valter Di Salvo
The present study examined site-specific hamstring muscles use with functional magnetic resonance imaging (MRI) in elite soccer players during strength training. Thirty-six players were randomized into four groups, each performing either Nordic hamstring, flywheel leg-curl, Russian belt or the hip-extension conic-pulley exercise. The transverse relaxation time (T2) shift from pre- to post-MRI were calculated for the biceps femoris long (BFl) and short (BFs) heads, semitendinosus (ST) and semimembranosus (SM) muscles at proximal, middle and distal areas of the muscle length...
2016: PloS One
John K De Witt, Kirk L English, J Brent Crowell, Kent L Kalogera, Mark E Guilliams, Bruce E Nieschwitz, Andrea M Hanson, Lori L Ploutz-Snyder
PURPOSE: The purpose of this investigation was to examine the reliability of the isometric mid-thigh pull (IMTP) and the relationship between IMTP peak force and deadlift 1 repetition maximum (1RM). METHODS: Nine subjects (5 m/4 f; 40.6 ± 8.0 yr; 1.72 ± 0.10 m; 75.6 ± 13.4 kg) participated in this study. IMTP and deadlift 1RM were both performed during 2 testing sessions. For IMTP, peak force and peak rate of force development (RFD) were determined, in addition to RFD at 30 ms, 50 ms, 90 ms, 150 ms, 200 ms, and 250 ms after initiation of the pull...
August 18, 2016: Journal of Strength and Conditioning Research
Zachary Meyer, William M Ricci
Patellar and quadriceps tendon ruptures are relatively common injuries. Rupture of the knee extensor mechanism may occur because of a forceful eccentric contraction of the quadriceps against a resisted flexed knee, though atraumatic cases have also been described. Patients at higher than normal risk for knee extensor mechanism rupture include those with systemic co-morbidities, fluoroquinolone use, and chronic tendinopathy. Early operative treatment and mobilization of acute extensor mechanism ruptures has proven effective, and numerous techniques have been described...
August 2016: Journal of Orthopaedic Trauma
Jordan M Joy, Roxanne M Vogel, Jordan R Moon, Paul H Falcone, Matt M Mosman, Zbigniew Pietrzkowski, Tania Reyes, Michael P Kim
BACKGROUND: Increased cellular ATP levels have the potential to enhance athletic performance. A proprietary blend of ancient peat and apple extracts has been supposed to increase ATP production. Therefore, the purpose of this investigation was to determine the effects of this supplement on athletic performance when used during 12 weeks of supervised, periodized resistance training. METHODS: Twenty-five healthy, resistance-trained, male subjects completed this study...
2016: BMC Complementary and Alternative Medicine
Moataz Eltoukhy, Francesco Travascio, Shihab Asfour, Shady Elmasry, Hector Heredia-Vargas, Joseph Signorile
BACKGROUND/AIMS: Loading during concurrent bending and compression associated with deadlift, hang clean and hang snatch lifts carries the potential for injury to the intervertebral discs, muscles and ligaments. This study examined the capacity of a newly developed spinal model to compute shear and compressive forces, and bending moments in lumbar spine for each lift. METHODS: Five male subjects participated in the study. The spine was modeled as a chain of rigid bodies (vertebrae) connected via the intervertebral discs...
September 2016: Journal of Orthopaedics
Cameron N Munger, Whitney D Leyva, David C Archer, Andrew J Galpin, Jared W Coburn, Lee E Brown
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Kellen Krajewski, Robert G LeFavi, Bryan L Riemann
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Kevin D Camara, Jared W Coburn, Dustin D Dunnick, Lee E Brown, Andrew J Galpin, Pablo B Costa
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
RoQue A Harmon, Kylie K Malyszek, Dustin D Dunnick, Pablo B Costa, Jared W Coburn, Lee E Brown
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Kylie K Malyszek, RoQue A Harmon, Dustin D Dunnick, Pablo B Costa, Jared W Coburn, Lee E Brown
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
J Derek Kingsley, Xián Mayo, Yu Lun Tai, Curtis Fennell
We investigated the effects of an acute bout of free-weight, whole-body resistance exercise consisting of the squat, bench press, and deadlift on arterial stiffness and cardiac autonomic modulation in sixteen (aged 23±3 yrs; mean±SD) resistance-trained individuals. Arterial stiffness, autonomic modulation and baroreflex sensitivity (BRS) were assessed at rest and following 3 sets of 10 repetitions at 75% 1 repetition maximum on each exercise with two minutes of rest between sets and exercises. Arterial stiffness was analyzed using carotid-femoral pulse wave velocity (cf-PWV)...
May 28, 2016: Journal of Strength and Conditioning Research
Eric R Helms, Adam Storey, Matt R Cross, Scott R Brown, Seth Lenetsky, Hamish Ramsay, Carolina Dillen, Michael C Zourdos
The purpose of this study was to compare average concentric velocity (ACV) and rating of perceived exertion (RPE) based on repetitions in reserve on the squat, bench press and deadlift. Fifteen powerlifters (3 female, 12 male, 28.4 ± 8.5 years) worked up to a one repetition maximum (1RM) on each lift. RPE was recorded on all sets and ACV was recorded for all sets performed at 80% of estimated 1RM and higher, up to 1RM. RPE at 1RM on the squat, bench press and deadlift was 9.6 ± 0.5, 9.7 ± 0.4 and 9.6 ± 0...
May 25, 2016: Journal of Strength and Conditioning Research
Kylie K Malyszek, RoQue A Harmon, Dustin D Dunnick, Pablo B Costa, Jared W Coburn, Lee E Brown
Those training for strength and power commonly use different bars and different lifts. The hexagonal barbell (HBar) and Olympic barbell (OBar) are frequently used training implements, and the mid-thigh pull and deadlift are two popular exercises. Therefore, the purpose of this study was to compare force between an HBar and OBar for a mid-thigh pull (MTP), deadlift (DL) and countermovement jump (CMJ). Twenty resistance trained men (age = 24.05 ± 2.09 yrs, ht = 178.07 ± 7.05 cm, mass = 91.42 ± 14.44 kg) volunteered to participate and performed MTP and DL utilizing both bars, and a CMJ...
May 14, 2016: Journal of Strength and Conditioning Research
Trevor W Blanchard, Camille Smith, Sylvain G Grenier
It has been shown that under isometric conditions, as the activity of the abdominal muscles increases, the thicknesses of the muscles also increase. The purpose of this experiment was to determine whether change in muscle thickness could be used as a measure of muscle activity during a deadlift as well as determining the effect of a weightlifting belt and/or the Valsalva maneuver on the muscle thicknesses. The Transversus Abdominis (TrA) and Internal Obliques (IO) muscles were analyzed at rest and during a deadlift...
June 2016: Journal of Electromyography and Kinesiology
Sam Gleadhill, James Bruce Lee, Daniel James
This research presented and validated a method of assessing postural changes during resistance exercise using inertial sensors. A simple lifting task was broken down to a series of well-defined tasks, which could be examined and measured in a controlled environment. The purpose of this research was to determine whether timing measures obtained from inertial sensor accelerometer outputs are able to provide accurate, quantifiable information of resistance exercise movement patterns. The aim was to complete a timing measure validation of inertial sensor outputs...
May 3, 2016: Journal of Biomechanics
Michael J Johnston, Christian J Cook, David Drake, Lisa Costley, Julie P Johnston, Liam P Kilduff
PURPOSE: The aim of this study was to compare the acute neuromuscular, biochemical, and endocrine responses of a training day consisting of a speed session only to performing a speed and weight training session on the same day Methods: Fifteen male academy level rugby players completed two protocols in a randomized order. The speed only protocol involved performing 6 maximal effort repetitions of 50m running sprints with 5 minutes recovery between each sprint, while the speed and weights protocol involved the same sprinting session but was followed 2 h post by a lower body weights session consisting of 4 sets of 5 back squat and Romanian deadlift at 85% 1RM...
March 18, 2016: Journal of Strength and Conditioning Research
Lawrence W Judge, Leslie J Urbina, Donald L Hoover, Bruce W Craig, Lani M Judge, Brianna M Leitzelar, David R Pearson, Kara A Holtzclaw, David M Bellar
Judge, LW, Urbina, LJ, Hoover, DL, Craig, BW, Judge, LM, Leitzelar, BM, Pearson, DR, Holtzclaw, KA, and Bellar, DM. The impact of competitive trait anxiety on collegiate powerlifting performance. J Strength Cond Res 30(9): 2399-2405, 2016-The purpose of this study was to determine the relationship between competitive trait anxiety measures and powerlifting (PL) performance. Thirty-six collegiate powerlifters on club teams from 3 universities were recruited during a competition (men = 26, women = 10; age = 19...
September 2016: Journal of Strength and Conditioning Research
Carl T Woods, Brad S Keller, Ian McKeown, Sam Robertson
Woods, CT, Keller, BS, McKeown, I, and Robertson, S. A comparison of athletic movement among talent-identified juniors from different football codes in Australia: implications for talent development. J Strength Cond Res 30(9): 2440-2445, 2016-This study aimed to compare the athletic movement skill of talent-identified (TID) junior Australian Rules football (ARF) and soccer players. The athletic movement skill of 17 TID junior ARF players (17.5-18.3 years) was compared against 17 TID junior soccer players (17...
September 2016: Journal of Strength and Conditioning Research
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