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Journal of Strength and Conditioning Research

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https://www.readbyqxmd.com/read/28195935/allometric-grip-strength-norms-for-children-of-hawaiian-lineage
#1
Morgan H Kocher, Rebecca K Romine, Christopher D Stickley, Charles F Morgan, Portia B Resnick, Ronald K Hetzler
PURPOSE: To determine allometric exponents for scaling grip strength in children that effectively control for body mass and height and develop normative grip strength data for Hawaiian children. METHODS: 1,437 students (754 boys) from a rural community in Hawaii participated in this 5-year study, resulting in 2,567 data points. Handgrip strength, body mass (BM), stature (Ht) were collected every year. Multiple log-linear regression was used to determine allometric exponents for BM and Ht...
December 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28549046/associations-of-physical-fitness-and-body-composition-characteristics-with-simulated-military-task-performance
#2
K Pihlainen, M Santtila, K Häkkinen, H Kyröläinen
The purpose of the present study was to evaluate the associations of physical fitness and body composition characteristics with anaerobic endurance performance, tested in the combat load using the occupationally relevant military simulation test (MST). Eighty-one male soldiers, deployed to a crisis management operation in the Middle East, volunteered for the study and participated in a test battery consisting measurements of muscle strength, body composition characteristics, endurance capacity, and MST.A Spearman correlational analysis revealed that the strongest variable, correlated with MST time, was the countermovement jump performed with the combat load (CMJ2) (rs = -0...
May 25, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28542090/5-km-time-trial-reliability-of-a-non-motorized-treadmill-and-comparison-of-physiological-and-perceptual-responses-versus-a-motorized-treadmill
#3
Hunter S Waldman, Alex J Heatherly, Ashton F Waddell, Ben M Krings, Eric K O'Neal
This study examined the reproducibility of performance across 3 non-motorized treadmill (NMT) 5-km time trials (TT) and physiological, gait, and perceptual differences of running at 5-km pace for both NMT and motorized treadmills (MT). Ten male runners experienced in road racing that had never run on a NMT completed 3 TT to establish personal best 5-km pace. In a later session, participants ran at this pace for 5 min on the NMT while metabolic, gait, and perceptual measures were recorded and then ran at outdoor 5-km personal best pace on a MT at 1% grade (counter-balanced crossover design)...
May 24, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486339/acute-effect-of-upper-and-lower-body-postactivation-exercises-on-shot-put-performance
#4
Eleni I Kontoy, Fani Berberidou, Theophilos C Pilianidis, Nikolaos I Mantzouranis, Spyridon K Methenitis
The purpose of the present study was to investigate the effect of different types of upper and lower' extremities exercises on acute increase of shot put performance, in moderate experienced throwers. Eight (n=8) males and nine (n=9) female throwers participated in the present study. Their bench press and squat maximum strength were measured while their shot put performance from power position was evaluated before and after four interventions: [1] plyometric push-ups (Plyo), [2] 6s isometric push-ups (Iso), [3] 3 countermovement jumps (CMJ) and [4] 10 reps...
May 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28489629/modulation-of-isometric-quadriceps-strength-in-soccer-players-with-transcranial-direct-current-stimulation-a-crossover-study
#5
Valentine Z Vargas, Abrahão F Baptista, Guilherme O C Pereira, Alberto C Pochini, Benno Ejnisman, Marcelo B Santos, Silvia M A João, Fuad A Hazime
The aim of this study was to evaluate the effect of transcranial direct current stimulation (tDCS) on the maximum isometric muscle contraction (MVIC) of the knee extensors in soccer players at the pre-professional level. Twenty female soccer players aged 15 to 17 years (mean = 16.1; SD = 0.9) with 5.2 ± 2.6 years of training were randomly divided into two groups to receive either active or sham tDCS in a single session (2 mA; 0.057mA/cm). The MVIC of the knee extensors was evaluated in both lower limbs by manual dynamometry in five sets of contractions divided into four blocks: (0) pre-stimulation, (1) during tDCS, (2) 30 minutes post-tDCS, and (3) 60 minutes post-tDCS...
May 9, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28445225/physical-fitness-and-body-composition-in-8-10-year-old-danish-children-are-associated-with-sports-club-participation
#6
Malte N Larsen, Claus M Nielsen, Christina Ørntoft, Morten B R Thomsen, Vibeke Manniche, Lone Hansen, Peter R Hansen, Jens Bangsbo, Peter Krustrup
We investigated whether physical fitness and body composition in 8[FIGURE DASH]10-year-old Danish children are associated with sports club participation. The study included 423 schoolchildren, comprising 209 girls and 214 boys, of whom 67 and 74%, respectively, were active in sports clubs. Yo-Yo Intermittent Recovery level 1 for Children (YYIR1C), balance, jump and coordination tests, together with DXA scans, were used to determine exercise capacity and body composition. Children active in sports clubs had better (P<0...
May 9, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486338/a-comparison-of-load-velocity-and-load-power-relationships-between-well-trained-young-and-middle-aged-males-during-three-popular-resistance-exercises
#7
John F T Fernandes, Kevin L Lamb, Craig Twist
This study examined the load-velocity and load-power relationships among 20 young (age 21.0 ± 1.6 y) and 20 middle-aged (age 42.6 ± 6.7 y) resistance trained males. Participants performed three repetitions of bench press, squat and bent-over-row across a range of loads corresponding to 20 to 80% of one repetition maximum (1RM). Analysis revealed effects (P < 0.05) of group and load x group on barbell velocity for all three exercises, and interaction effects on power for squat and bent-over-row (P < 0...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486337/hypertrophic-effects-of-concentric-versus-eccentric-muscle-actions-a-systematic-review-and-meta-analysis
#8
Brad J Schoenfeld, Dan Ogborn, Andrew D Vigotsky, Martino Franchi, James W Krieger
Controversy exists as to whether different dynamic muscle actions produce divergent hypertrophic responses. The purpose of this paper was to conduct a systematic review and meta-analysis of randomized controlled trials comparing the hypertrophic effects of concentric versus eccentric training in healthy adults following regimented resistance training (RT). Studies were deemed eligible for inclusion if they met the following criteria: 1) were an experimental trial published in an English-language refereed journal; 2) directly compared concentric and eccentric actions without the use of external implements (i...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486336/seasonal-variations-of-bone-metabolism-and-bone-mineral-density-in-collegiate-alpine-skiers
#9
Teruyuki Sato, Keishoku Sakuraba, Yosuke Tsuchiya, Shinya Maruyama, Eisuke Ochi
This study investigated the seasonal variations in bone metabolism, mineral density, and physical characteristics in collegiate alpine skiers. Twelve male subjects (20.6 ± 1.5 years) were evaluated for body composition, body mineral density (BMD), serum levels of osteocalcin (OC), bone alkaline phosphatase (BAP), tartrate-resistant acid phosphatase 5b (TRACP-5b), parathormone, and 25-hydroxyvitamin D (25(OH)D). We also measured the knee extensor and flexor strength, maximal power, and vertical jump. Measurements were conducted in the pre-season period (T1), competitive period (T2), end-of-season period (T3), and resting period (T4)...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486335/effects-of-two-combined-exercise-designs-associated-with-high-fat-meal-consumption-on-postprandial-lipemia-insulinemia-and-oxidative-stress
#10
Juliano Boufleur Farinha, Carlos Ernani Olendzki de Macedo, Josianne Rodrigues-Krause, Renata Lopes Krüger, Francesco Pinto Boeno, Rodrigo Cauduro Oliveira Macedo, Jéssica do Nascimento Queiroz, Bruno Costa Teixeira, Alvaro Reischak-Oliveira
BACKGROUND AND AIM: Impaired postprandial lipaemia (PPL) response after the consumption of a high-fat meal (HFM) is linked to diabetes, oxidative stress, and cardiovascular events. The aim of this study was to investigate lipid and glucose metabolism, and oxidative stress responses of two different combined exercise designs associated with high-fat meal (HFM) consumption. METHODS: Eleven healthy and physically active men (27.36 ± 5.04 years) participated in this study...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486334/aerobic-exercise-supplemented-with-muscular-endurance-training-improves-onset-of-blood-lactate-accumulation
#11
John W Farrell, David J Lantis, Carl J Ade, Greg S Cantrell, Rebecca D Larson
Studies have shown that when aerobic exercise is supplemented with muscular endurance training metabolic adaptions occur that result in the delay of the onset of blood lactate accumulation (OBLA). However, previous studies have not explored any submaximal cardiorespiratory adaptations that may result from this training protocol. The aim of the current investigation was to evaluate the effect of supplementing an aerobic exercise training program with a muscular endurance training program on various cardiorespiratory and metabolic measurements...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486333/the-relationship-between-the-push-off-ground-reaction-force-and-ball-speed-in-high-school-baseball-pitchers
#12
Sakiko Oyama, Joseph B Myers
Baseball pitching is a sequential movement that requires transfer of momentum from the lower extremity to the throwing arm. Therefore, the ground reaction force (GRF) during push off is suggested to play a roll in production of ball speed. The purpose of this study was to investigate the correlation between GRF characteristics during push off and ball speed in high school baseball pitchers. A total of 52 pitchers performed fast pitches from an indoor pitching mound. A force plate embedded in an indoor mound was used to capture the push off GRF...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486332/short-term-heat-acclimation-and-precooling-independently-and-combined-improve-5-km-running-performance-in-the-heat
#13
C A James, A J Richardson, A G B Willmott, P W Watt, O R Gibson, N S Maxwell
Following heat acclimation (HA), endurance running performance remains impaired in hot vs temperate conditions. Combining HA with precooling demonstrates no additive benefit in intermittent sprint, or continuous cycling exercise protocols, during which heat strain may be less severe compared to endurance running. This study investigated the effect of short-term heat acclimation (STHA) combined with mixed-methods precooling, on endurance running performance and directly compared precooling and HA. Nine amateur trained runners completed 5 km treadmill time trials in the heat (32°C, 60% RH) under four conditions; no intervention (CON), precooling (PC), short-term heat acclimation (5 days - HA) and short-term heat acclimation with precooling (HA+PC)...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486331/effect-of-body-position-on-force-production-during-the-isometric-mid-thigh-pull
#14
George K Beckham, Kimitake Sato, Satoshi Mizuguchi, G Gregory Haff, Michael H Stone
Various body positions have been used in the scientific literature when performing the isometric mid-thigh pull resulting in divergent results. We evaluated force production in the isometric mid-thigh pull in bent (125° knee and 125° hip angles) and upright (125° knee, 145° hip angle) positions in subjects with (>6 months) and without (< 6 months) substantial experience using weightlifting derivatives. A mixed-design ANOVA was used to evaluate the effect of pull position and weightlifting experience on peak force, force at 50ms, 90ms, 200ms, and 250ms...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486330/the-impact-of-dry-land-sprint-start-training-on-the-short-track-speed-skating-start
#15
William B Haug, Eric J Drinkwater, Nicholas J Cicero, J Anthony Barthell, Dale W Chapman
This investigation sought to determine the effects of dry-land sprint start training on short track speed skating (STSS) start performance. Nine highly trained short track athletes completed a control period of normal STSS training followed by a four-week training intervention. Before and after the control and intervention periods, athletes performed three electronically timed dry-land and on-ice 14.43 m maximal sprint start efforts. The intervention consisted of two sprint sessions per week consisting of nine electronically timed 14...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28486329/effect-of-short-term-coenzyme-q10-supplementation-and-pre-cooling-on-serum-endogenous-antioxidant-enzymes-of-elite-swimmers
#16
Ali Emami, Asghar Tofighi, Siamak A Rezayi, Behnaz B Gilani
This study aimed to investigate the effect of the use of a two-week pre-cooling strategy and supplementation coenzyme Q10 (CoQ10) on superoxide dismutase (SOD), catalase (CAT), and serum glutathione peroxidase (GPx) in elite, adolescent swimmers during heavy and regular trainings and recording of freestyle swimming. 36 healthy males (mean ± SD; age: 17.5±1.1, body fat content: 14.55±1.75%) were randomly selected and divided into four groups of CoQ10 (300 mg/d), precooling (immersion in the water at 18 ± 0...
May 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28459793/effect-of-different-training-methods-on-stride-parameters-in-speed-maintenance-phase-of-100m-sprint-runningmel
#17
Emel Cetin, Ibrahim Ethem Hindistan, Yasar Gul Ozkaya
This study examined the effects of two different training methods relevant to sloping surface on stride parameters in speed maintenance phase of 100 m sprint running. Twenty recreationally active students were assigned into one of three groups: combined training (Com), horizontal training (H), and control (C) group. Com group performed uphill and downhill training on a sloping surface with an angle of 4°, while H group trained on a horizontal surface, 3 days a week for 8 weeks. Speed maintenance and deceleration phases were divided into distances with 10m intervals, and running time (t), running velocity (RV), step frequency (SF) and step length (SL) were measured at pre-, and post-exercise period...
April 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28459795/four-weeks-of-nordic-hamstring-exercise-reduce-muscle-injury-risk-factors-in-young-adults
#18
João Breno de A R Alvares, Vanessa Bernardes Marques, Marco Aurélio Vaz, Bruno Manfredini Baroni
The Nordic hamstring exercise (NHE) is a field-based exercise designed for knee-flexor eccentric strengthening, aimed at muscle strains prevention. However, possible effects of NHE programmes on other hamstring injury risk factors remain unclear. The purpose of this study was to investigate the effects of a NHE training programme on multiple hamstring injury risk factors. Twenty physically active young adults were allocated into two equal sized groups: control group (CG) and training group (TG). The TG was engaged in a 4-week NHE programme, twice a week, 3 sets of 6-10 repetitions; while CG received no exercise intervention...
April 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28459794/effectiveness-of-a-16-week-high-intensity-cardio-resistance-training-hicrt-program-in-adults
#19
Tina A Greenlee, Daniel R Greene, Nathan J Ward, Ginger E Reeser, Courtney M Allen, Nicholas W Baumgartner, Neal J Cohen, Arthur F Kramer, Charles H Hillman, Aron K Barbey
The purpose of this study was to determine the efficacy of a novel, 16-week High-Intensity Cardio-Resistance Training (HICRT) program on measures of aerobic fitness, agility, aerobic power, muscular endurance, lower body explosive power, and self-reported activity level. The intervention group (N=129; 63 f, 24.65±5.55 y) had a baseline VO2max of 39.83±9.13. These individuals participated in 26, 70-minute exercise sessions, and 4 fitness testing sessions. Participants were matched with a non-exercise control group, paired by sex, age, and baseline VO2max...
April 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28475553/competition-load-described-by-objective-and-subjective-methods-during-a-surfing-championship
#20
Iosu Fernández-Gamboa, Javier Yanci, Cristina Granados, Bret Freemyer, Jesús Cámara
The aims of this study were to describe the competition load of surfers during a single heat via objective and subjective methods and to analyze the relationship between objective and subjective methods with the judges' score. Ten competitive surfers were fitted with a global positioning system (GPS) during a competitive heat. The GPS was synchronized with a chronometer and a stationary video camera to identify the surfer's specific actions. After the end of each heat, participants were assessed for the rating of perceived respiratory and muscular exertion (RPEres, RPEmus) and also official scores from every participant were collected...
April 25, 2017: Journal of Strength and Conditioning Research
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