journal
MENU ▼
Read by QxMD icon Read
search

Journal of Strength and Conditioning Research

journal
https://www.readbyqxmd.com/read/29337829/estimation-of-repetitions-to-failure-for-monitoring-resistance-exercise-intensity-building-a-case-for-application
#1
Daniel A Hackett, Stephen P Cobley, Mark Halaki
The purpose of this study was to 1) examine the accuracy of Estimated Repetitions to Failure (ERF) during resistance exercise between two sessions, and 2) compare ERF to RPE (Rating of Perceived Exertion) for determining proximity to momentary failure. Forty-eight adults with recreational resistance training experience performed 3 sets of 10 repetitions at 70% 1RM and 80% 1RM for the chest press and leg press respectively. At the completion of each set, participants reported their ERF and then continued repetitions to failure to determine actual repetitions to failure (ARF)...
January 15, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29334582/carbohydrate-mouth-rinsing-does-not-prevent-the-decline-in-maximal-strength-following-fatiguing-exercise
#2
Christopher D Black, Daniel J Schubert, Marcin K Szczyglowski, Joshua D Wren
Carbohydrate (CHO) rinsing has been shown to attenuate the decline of maximal voluntary contractions (MVC) following fatiguing exercise-perhaps via a central mechanism. This study sought to determine the effect of a CHO rinse on MVC, voluntary activation, and contractile properties following fatiguing exercise. Thirteen adults participated in a double-blind, cross-over study. MVC of the dominant knee extensors was assessed and voluntary activation (%VA) was determined using twitch-interpolation. Participants then held 50% of MVC until volitional fatigue followed by a 20s rinse with a solution of 8% maltodextrin (CHO) or placebo (PLA)...
January 12, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29334581/gender-and-muscle-specific-responses-during-fatiguing-exercise
#3
Ethan C Hill, Terry J Housh, Cory M Smith, Richard J Schmidt, Glen O Johnson
The purpose of the present investigation was to examine potential gender-related differences in electromyographic (EMG) and mechanomyographic (MMG) responses during submaximal, concentric, isokinetic, forearm flexion muscle contractions. Twelve men and twelve women performed concentric peak torque trials prior to (pretest) and following (posttest) a fatiguing exercise bout that consisted of 50 submaximal (65% of concentric peak torque), concentric, isokinetic (60°·s), forearm flexion muscle contractions. Surface EMG and MMG signals were simultaneously recorded from the biceps brachii and brachioradialis muscles...
January 12, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29334580/the-power-load-relationship-during-a-countermovement-jump-a-joint-level-analysis
#4
Kym J Williams, Dale W Chapman, Elissa J Phillips, Nick Ball
This study aimed to investigate if hip, knee and ankle peak power is influenced by the relative load lifted, altering the joint and system load-power relationship during a countermovement jump (CMJ). Twenty-Three male national representative athletes (age: 20.3 ± 3.1y, squat 1RM: 133.8 ± 24.8kg) completed three CMJs at relative barbell loads of 0, 10, 20, 30 and 40% of an athlete's estimated back squat 1RM. Ground reaction force and joint kinematics were captured using a 16 camera motion capture array integrated with two in ground tri-axial force plates...
January 12, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29329155/ecological-validity-and-reliability-of-an-age-adapted-endurance-field-test-in-young-male-soccer-players
#5
Carlo Castagna, Peter Krustrup, Stefano D'Ottavio, Carlo Pollastro, Andrea Bernardini, Susana Cristina Araújo Póvoas
The purpose of this study was to examine the reliability and the association with relevant match activities (ecological validity) of an age-adapted field test for intermittent high-intensity endurance known as Yo-Yo intermittent recovery level 1 children test (YYIR1C) in young male soccer players. Twenty-eight young male outfield soccer players (age 11.1±0.9 years, height 142±4.4 cm, body mass 37.0±5.9 kg) with at least 2 years of experience in soccer competitions were tested twice using YYIR1C and an age-adapted competitive small-sided game (i...
January 11, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29329154/effects-on-volume-load-and-ratings-of-perceived-exertion-in-individuals-advanced-weight-training-after-transcranial-direct-current-stimulation
#6
Eduardo Lattari, Blair José Rosa Filho, Sidnei Jorge Fonseca Junior, Eric Murillo-Rodriguez, Nuno Rocha, Sérgio Machado, Geraldo Albuquerque Maranhão Neto
The aim of this study was investigate the effects of transcranial direct current stimulation (tDCS) on volume-load and ratings of perceived exertion. Fifteen young healthy individuals, aged between 20 and 30 years in advanced strength training were recruited. Test and retest of the 10 maximum repetitions (10RM) were performed to determine the reliability of load utilized. Subjects performed three experimental conditions in a randomized, double-blinded crossover design: anodic stimulation (a-tDCS), cathodic stimulation (c-tDCS) and sham (2 mA for 20 minutes targeting the dorsolateral prefrontal cortex cortex left)...
January 11, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29324575/the-relationship-between-tennis-serve-velocity-and-select-performance-measures
#7
Matthew J Hayes, Dirk R Spits, David G Watts, Vincent G Kelly
The purpose of this study was to determine if there was a relationship between tennis serve speed and isometric mid-thigh pull (IMTP) kinetic variables; countermovement jump height (CMJ Height), shoulder internal and external rotation strength and anthropometric measures in elite adolescent tennis players. Twenty-one elite junior tennis players from the Tennis Australia National Academy were recruited for this study (male, n = 12, female, n = 9). Correlations between the performance variables and peak tennis serve speed were calculated using a Pearson's product-moment correlation coefficient...
January 10, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29319600/abdominal-muscle-activation-during-common-modifications-of-the-trunk-curl-up-exercise
#8
Martin Eriksson Crommert, Anna Bjerkefors, Olga Tarassova, Maria M Ekblom
The purpose of this study was to investigate effects of common modifications of trunk curl-up exercise on the involvement of the abdominal muscles, particularly the deepest muscle layer, transversus abdominis (TrA). Ten healthy females performed five different variations of the trunk curl-up at a standardized speed, varying the exercise by assuming three different arm positions and applying left and right twist. Indwelling fine-wire electromyography (EMG) electrodes were used to record from TrA, obliquus internus (OI), obliquus externus (OE) and rectus abdominis (RA) unilaterally on the right side...
January 9, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29324580/the-relationship-between-skating-economy-and-performance-during-a-repeated-shift-test-in-elite-and-sub-elite-ice-hockey-players
#9
Nicholas R Lamoureux, Grant R Tomkinson, Benjamin J Peterson, John S Fitzgerald
The purpose of this study was to determine the importance of skating economy to fatigue during repeated high-intensity efforts of a simulated ice hockey shift. Forty-five collegiate and Junior A male ice hockey players (aged 18-24 years) performed a continuous graded exercise test using a skate treadmill. Breath-by-breath data for oxygen consumption (V[Combining Dot Above]O2) and respiratory exchange ratio were collected and used to derive energy expenditure (EE) averaged over the final 10 seconds of each stage...
January 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29324579/traditional-vs-suspended-pushup-muscle-activation-in-athletes-and-sedentary-females
#10
Majid M Syed-Abdul, Dhwani S Soni, William M Miller, Ryan J Johnson, Jeremy T Barnes, Thomas J Pujol, Jason D Wagganer
Many strength training (ST) programs incorporate pushup exercises, which primarily activate upper body muscles. Past data supports the fact that shoulder girdle muscles [i.e., triceps (T) and anterior deltoids (AD)] exhibit greater electromyography (EMG) activity when a pushup is performed on an unstable [i.e., suspended (SP)] vs. stable [i.e., traditional (TD)] surface (Andrade, 2011). Sixty-nine healthy female volunteers [soccer players (SO), n=24; gymnasts (GY), n=21; sedentary (SE), n=24) performed three TD and three SP pushups...
January 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29324578/training-volume-not-frequency-indicative-of-maximal-strength-adaptations-to-resistance-training
#11
Ryan J Colquhoun, Christopher M Gai, Danielle Aguilar, Daniel Bove, Jeffrey Dolan, Andres Vargas, Kaylee Couvillion, Nathaniel D M Jenkins, Bill I Campbell
PURPOSE: To compare the effects of a high- versus a moderate-training frequency on maximal strength and body composition. METHODS: 28 young, healthy resistance-trained males were randomly assigned to either: 3x/week (3x; n=16) or 6x/week (6x; n=12). Dependent variables (DVs) assessed at baseline and after the 6-week training intervention included: squat 1RM (SQ1RM), bench press 1RM (BP1RM), deadlift 1RM (DL1RM), powerlifting total (PLT), Wilk's coefficient (WC), fat-free mass (FFM) and fat mass (FM)...
January 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29324577/physical-fitness-performance-of-young-professional-soccer-players-does-not-change-during-several-training-seasons-in-a-spanish-elite-reserve-team-a-club-study-1996-2013
#12
Asier Los Arcos, Javier Martins
The purpose of the study was to assess the changes in physical fitness performance in young professional soccer players during several training seasons in a Spanish elite reserve team. Physical test values (i.e. vertical jump test, straight line sprint test, and discontinuous and progressive submaximal running test) of 97 young professional soccer players that belonged for at least two consecutive seasons to the reserve team of a Spanish professional team from 1996 to 2013 were analyzed. A distinction was made between the soccer players that were promoted to the Spanish 1/2 Divisions (n = 38) (PFL) and those that were not (n = 59) (non-PFL) (until the end of the 2016/2017 season)...
January 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29324576/intermittent-cooling-during-judo-training-in-a-warm-humid-environment-reduces-autonomic-and-hormonal-impact
#13
Eduardo Carballeira, José Morales, David H Fukuda, María L Granada, Vicente Carratalá-Deval, Alfonso López Díaz de Durana, Jeffrey R Stout
The purpose of this study was to identify the effects of superficial cooling on physiological responses while training in a warm, humid environment during an international judo training camp. Sixteen judokas (8 women and 8 men) participated in the experiment. Four high-level women and four men were randomly assigned to wear a cooling vest (vest group, VG) during the recovery periods within a training session (i.e. 8 bouts of 5 min fighting with 5 min rest) and up to 10 min after the session, while the remaining athletes in the control group (CG) trained without the use of any cooling aids...
January 5, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29337834/manipulating-field-dimensions-during-small-sided-games-impacts-the-technical-and-physical-profiles-of-australian-footballers
#14
Fleay Brock, Joyce Christopher, Banyard Harry, Woods T Carl
This study investigated the effect of manipulating field dimensions on the technical and physical profiles of Australian football (AF) players during small-sided games (SSGs). A total of 40 male players (23.9 ± 3.5 y) participated in three, five-a-side SSGs; defined as 'small' (20m x 30m; 600m), 'medium' (30m x 40m; 1200m), and 'large' (40m x 50m; 2000m). Notational analyses enabled the quantification of technical skill indicators, while physical activity profiles were measured using microtechnology, resulting in 18 criterion variables...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29337833/effects-of-plyometric-and-resistance-training-on-muscle-strength-explosiveness-and-neuromuscular-function-in-young-adolescent-soccer-players
#15
Brandon John McKinlay, Phillip Wallace, Raffy Dotan, Devon Long, Craig Tokuno, David Gabriel, Bareket Falk
This study examined the effect of 8-weeks of free-weight-resistance (RT) and plyometric (PLYO) training on maximal strength, explosiveness and jump performance compared with no added training (CON), in young male soccer players. Forty-one 11[FIGURE DASH]13-year-old soccer players were divided into three groups (RT, PLYO, CON). All participants completed isometric and dynamic (240°/s) knee extensions pre- and post-training. Peak torque (pT), peak rate of torque development (pRTD), electromechanical-delay (EMD), rate of muscle activation (Q50), m...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29337832/comparison-of-step-by-step-kinematics-in-repeated-30m-sprints-in-female-soccer-players
#16
Roland van den Tillaar
The aim of this study was to compare kinematics in repeated 30m sprints in female soccer players. Seventeen subjects performed seven 30m sprints every 30s in one session. Kinematics were measured with an infrared contact mat and laser gun, and running times with an electronic timing device. The main findings were that sprint times increased in the repeated sprint ability test. The main changes in kinematics during the repeated sprint ability test were increased contact time and decreased step frequency, while no change in step length was observed...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29337831/the-acute-effects-of-a-caffeine-containing-supplement-on-anaerobic-power-and-subjective-measurements-of-fatigue-in-recreationally-active-males
#17
Chelsea J Hahn, Andrew R Jagim, Clayton L Camic, Matthew J Andre
Studies show mixed results for the effects of caffeine on performance, warranting further investigation. The purpose of this study was to examine the acute effects of a caffeine-containing supplement on anaerobic power and subjective measurements of fatigue during resisted sprinting on males. Fourteen recreationally-active males [N=14; (mean±SD), age: 21.0±0.7 yrs., height: 178.5±5.1 cm, weight: 77.3±9.6 kg, percent body fat: 12.6±4.8%] participated in a double-blind, placebo controlled, within-subjects crossover design study...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29337830/exploring-the-effects-of-playing-formations-on-tactical-behaviour-and-external-workload-during-football-small-sided-games
#18
Jorge Baptista, Bruno Travassos, Bruno Gonçalves, Paulo Mourão, João L Viana, Jaime Sampaio
This study aimed to identify the effects of playing formations on tactical behaviour and external workload during football small-sided games. Twenty-three semi-professional footballers integrated three different playing formations in a 7-a-side small-sided game, according to their specific player positions: team 4:3:0 (4 defenders, 3 midfielders); team 4:1:2 (4 defenders, 1 midfielder, 2 forwards); and team 0:4:3 (4 midfielders, 3 forwards). Based on players' movement trajectories, the following individual and collective tactical variables were calculated: total distance covered and distance covered while walking, jogging, running and sprinting, distance from each player to both own and opponent's team centroid (Dist CG and Dist OPP CG, respectively), individual area, team length, team width and surface area...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29309390/aerobic-exercise-preconception-and-during-pregnancy-enhances-oxidative-capacity-in-the-hindlimb-muscles-of-mice-offspring
#19
Jenney Liu, Icksoo Lee, Han-Zhong Feng, Sujay S Galen, Philipp P Hüttemann, Guy A Perkins, J-P Jin, Maik Hüttemann, Moh H Malek
Little is known about the effect of maternal exercise on offspring skeletal muscle health. The purpose of this study, therefore, was to determine whether maternal exercise (preconception and during pregnancy) alters offspring skeletal muscle capillarity and mitochondrial biogenesis. We hypothesized that offspring from exercised dams would have higher capillarity and mitochondrial density in the hindlimb muscles compared to offspring from sedentary dams. Female mice in the exercise condition had access to a running wheel in their individual cage 30 days prior to mating and throughout pregnancy, whereas the sedentary group did not have access to the running wheel prior to mating and during pregnancy...
January 3, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29309389/acute-effects-of-back-squats-on-countermovement-jump-performance-across-multiple-sets-of-a-contrast-training-protocol-in-resistance-trained-males
#20
Pascal Bauer, Pierpaolo Sansone, Benedikt Mitter, Bojan Makivic, Laurent B Seitz, Harald Tschan
The present study was designed to evaluate the voluntary post-activation potentiation (PAP) effects of moderate (MI) or high intensity (HI) back squat exercises on countermovement jump (CMJ) performance across multiple sets of a contrast training protocol. Sixty resistance-trained male subjects (age, 23.3 ± 3.3 y; body mass, 86.0 ± 13.9 kg; parallel back squat 1-repetition maximum [1-RM], 155.2 ± 30.0 kg) participated in a randomized, cross-over study. After familiarization, the subjects visited the laboratory on three separate occasions...
January 3, 2018: Journal of Strength and Conditioning Research
journal
journal
31543
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"