Abstract：
:Lawrence, MA, Ostrowski, SJ, Leib, DJ, and Carlson, LA. Effect of unstable loads on stabilizing muscles and bar motion during the bench press. J Strength Cond Res XX(X): 000-000, 2018-Unstable loads are anecdotally used to increase muscle stabilizer strength and utilization; however, there is little evidence to support these claims. Twelve male powerlifters (age 28.6 ± 5.2 years, body mass 105.6 ± 14.5 kg, lifting experience 9.8 ± 6.0 years, and bench press 5 repetition maximum [5RM] 133.6 ± 30.9 kg) pressed their 5RM in one stable condition with a standard barbell, and 3 unstable conditions using a flexible barbell with weights suspended from elastic bands. Mean integrated muscle activity for each repetition of the stabilizers and prime movers were measured. A Lyapunov exponent and sample entropy indicated unstable loads were less predictable and more variable in the superior/inferior direction, thus more challenging to control, despite decreased loads. The main finding was increased bicep activity in all unstable conditions (light bands and plates, +57%; mini bands and plates, +67%; and mini bands and kettlebells, +88%). Although less weight was used in the unstable 5RMs, most stabilizer muscle activity was not different between conditions, suggesting that the amount of weight used during unstable load training (up to 32.3% less load) may be limited by the ability of stabilizer muscles to control the load.
journal_name
J Strength Cond Resjournal_title
Journal of strength and conditioning researchauthors
Lawrence MA,Ostrowski SJ,Leib DJ,Carlson LAdoi
10.1519/JSC.0000000000002788subject
Has Abstractpub_date
2018-08-21 00:00:00eissn
1064-8011issn
1533-4287pub_type
杂志文章abstract：:Konarski, JM, Konarska, A, Strzelczyk, R, Skrzypczak, M, and Malina, RM. Internal and external loads during Hockey 5's competitions among U16 players. J Strength Cond Res XX(X): 000-000, 2019-The purpose of the study was to characterize the external and internal loads associated with Hockey 5's, the modified small-sid...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000003251
更新日期：2019-07-31 00:00:00
abstract：:Del Coso, J, Salinero, JJ, Lara, B, Gallo-Salazar, C, Areces, F, Herrero, D, and Puente, C. Polygenic profile and exercise-induced muscle damage by a competitive half-ironman. J Strength Cond Res 34(5): 1400-1408, 2020-To date, it is still unknown why some individuals develop higher levels of muscle damage than other ...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000002303
更新日期：2020-05-01 00:00:00
abstract：:Sánchez-Sánchez, J, García-Unanue, J, Felipe, JL, Jiménez-Reyes, P, Viejo-Romero, D, Gómez-López, M, Hernando, E, Burillo, P, and Gallardo, L. Physical and physiological responses of amateur football players on third generation artificial turf systems during simulated game situations. J Strength Cond Res 30(11): 3165-...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000001415
更新日期：2016-11-01 00:00:00
abstract：:Rago, V, Brito, J, Figueiredo, P, Ermidis, G, Barreira, D, and Rebelo, A. The arrowhead agility test: Reliability, minimum detectable change, and practical applications in soccer players. J Strength Cond Res 34(2): 483-494, 2020-Four independent studies were conducted to examine the utility of the arrowhead agility te...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000002987
更新日期：2020-02-01 00:00:00
abstract：:Based on electromyographic (EMG) studies, an anterior (in front of the face) wide grip with a pronated forearm has been recommended as the optimal lat pull-down (LPD) variation for strengthening the latissimus dorsi (LD) (Signorile, JF, Zink, A, and Szwed, S. J Strength Cond Res 16: 539-546, 2002; Wills, R, Signorile,...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章,随机对照试验
doi：10.1519/JSC.0b013e3181ddb0ab
更新日期：2010-07-01 00:00:00
abstract：:Till, K, Darrall-Jones, J, Weakley, JJ, Roe, GA, and Jones, BL. The influence of training age on the annual development of physical qualities within academy rugby league players. J Strength Cond Res 31(8): 2110-2118, 2017-Previous research in academy rugby league players has evaluated the development of physical quali...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000001546
更新日期：2017-08-01 00:00:00
abstract：:This study compared conventional, complex, and contrast protocols on peak power (PP) output. Static vs. dynamic contractions were also manipulated to determine the effect of these confounding variables. Eighteen recreationally trained men [age, 21.1 ± 3.3 years; body mass, 81.7 ± 15.9 kg; height, 182.8 ± 6.2 cm; 5 rep...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0b013e318299a68b
更新日期：2014-02-01 00:00:00
abstract：:The purpose of this study was to determine abdominal muscle temporal responses to a leg-loading exercise protocol and if differences exist between those able and unable to minimize lumbar-pelvic motion during this protocol. The focus was a supine bilateral leg-loading task that incorporated a slide (level 4) or no sli...
journal_title：Journal of strength and conditioning research
pub_type： 临床试验,杂志文章
doi：10.1519/JSC.0b013e3181ce24c7
更新日期：2010-05-01 00:00:00
abstract：:Healthy, sedentary, college-age subjects (n = 16) performed concentric or eccentric maximal unilateral isokinetic (1.08 rad s(-1)) elbow flexor contractions (4 sets of 12 repetitions) to fatigue as physiological data were concurrently collected. Net caloric expenditure was determined using indirect calorimetry, wherea...
journal_title：Journal of strength and conditioning research
pub_type： 临床试验,杂志文章,随机对照试验
doi：
更新日期：2001-02-01 00:00:00
abstract：:Cotter, JA, Garver, MJ, Dinyer, TK, Fairman, CM, and Focht, BC. Ratings of perceived exertion during acute resistance exercise performed at imposed and self-selected loads in recreationally trained women. J Strength Cond Res 31(8): 2313-2318, 2017-Resistance exercise (RE) is commonly used to elicit skeletal muscle ada...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000001782
更新日期：2017-08-01 00:00:00
abstract：:The purpose of this study was to determine if associated characteristics of muscle dysmorphia (MD) were different between elite-level competitive bodybuilders and power lifters. Elite-level competitive bodybuilders (n = 100) and power lifters (n = 68) completed the muscle dysmorphia inventory (MDI) at the time of or i...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：
更新日期：2002-11-01 00:00:00
abstract：:Farinatti, P, Paes, L, Harris, EA, Lopes, GO, and Borges, JP. A simple model to identify risk of sarcopenia and physical disability in HIV-infected patients. J Strength Cond Res 31(9): 2542-2551, 2017-Early detection of sarcopenia might help preventing muscle loss and disability in HIV-infected patients. This study pr...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000002070
更新日期：2017-09-01 00:00:00
abstract：:Currently, a submaximal protocol is used to measure cardiorespiratory fitness in firefighters by estimating their true aerobic capacity (V[Combining Dot Above]O2max); however, this submaximal test has not been cross-validated among firefighters. Thirty firefighters (85% male, 15% female), completed the submaximal prot...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000000481
更新日期：2014-10-01 00:00:00
abstract：:This study sought to compare the anthropometric profiles of 17 weaker and 17 stronger Australasian and Pacific powerlifters who had competed in a regional-, national-, or international-level powerlifting competition in New Zealand. Stronger lifters were defined as those having a Wilks score greater than 410, whereas t...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0b013e3181b8d67a
更新日期：2009-11-01 00:00:00
abstract：:The purpose of this study was to examine the effects of simultaneously delivering 2 channels of electromyostimulation (EMS) current using 2 different electrode arrangements. Ten men and 10 women university students had 4 reusable electrodes placed (2 proximal, 2 distal) medial and lateral on the quadriceps muscle grou...
journal_title：Journal of strength and conditioning research
pub_type： 临床试验,杂志文章
doi：
更新日期：2001-02-01 00:00:00
abstract：:The aim of this study was to compare the effects of resistance training using block periodization (BP) and weekly undulating (WUD) model on maximal strength and hypertrophy in recreationally strength trained women. Seventeen recreationally trained women were randomly assigned to either a BP group (n = 9; age = 24.7 ± ...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000000948
更新日期：2015-10-01 00:00:00
abstract：:Thirty-two master athletes (shot put, discus, and hammer throw) were divided into 4 groups according to their age (T40 [40 years of age], 50 [50 years of age], 60 [60 years of age], and 75 [75 years of age]). Twenty-eight age-matched men served as controls (C40 [40 years of age], 50 [50 years of age], 60 [60 years of ...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/00124278-200702000-00039
更新日期：2007-02-01 00:00:00
abstract：:There are many tests available to coaches and practitioners who seek to identify a point during exercise when excess lactate is being produced or hyperventilation stimulated as a result of metabolic acidosis. This investigation sought to determine the relationship between performance and the first occurrence of excess...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0b013e31826549ef
更新日期：2013-05-01 00:00:00
abstract：:Vitale, JA, Caumo, A, Roveda, E, Montaruli, A, La Torre, A, Battaglini, CL, and Carandente, F. Physical attributes and NFL Combine performance tests between Italian National League and American football players: a comparative study. J Strength Cond Res 30(10): 2802-2808, 2016-The purpose of this study was to examine a...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000001377
更新日期：2016-10-01 00:00:00
abstract：:The purpose of this study was to compare the peak force and force curve characteristics during a traditional bench press (BP) and a ballistic bench throw (BT). Eight (age = 21.0 +/- 2.3 years, height = 182.3 +/- 7.4 cm, body mass = 85.9 +/- 5.5 kg) semi-professional rugby league players with resistance and power train...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章,随机对照试验
doi：10.1519/JSC.0b013e3181874735
更新日期：2008-11-01 00:00:00
abstract：:de Souza, HLR, Arriel, RA, Hohl, R, da Mota, GR, and Marocolo, M. Is ischemic preconditioning intervention occlusion-dependent to enhance resistance exercise performance? J Strength Cond Res XX(X): 000-000, 2019-Ischemic preconditioning is a rising technique with potential to improve performance. Currently, its effect...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000003224
更新日期：2019-07-22 00:00:00
abstract：:This study aimed to determine whether the duration (0, 6, or 24 hours) of recovery between strength and aerobic sequences influences the responses to a concurrent training program. Fifty-eight amateur rugby players were randomly assigned to control (CONT), concurrent training (C-0h, C-6h, or C-24h), or strength traini...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000000798
更新日期：2016-03-01 00:00:00
abstract：:Estibaliz, R, Fabio, N, Rodrigo, RC, Daniel, C, Josune, RN, and Javier Y. Differences in physical performance according to the competitive level in amateur handball players. J Strength Cond Res 34(7): 2048-2054, 2020-The aim of this study was to compare physical performance in amateur handball players of 2 different c...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000002533
更新日期：2020-07-01 00:00:00
abstract：:The purpose of this investigation was to examine the effects of unilateral, isometric training of the forearm flexors on strength and the mechanomyographic (MMG) and electromyographic (EMG) responses of the biceps brachii in the trained and untrained limb at three joint angles. Seventeen adult females (mean age +/- SD...
journal_title：Journal of strength and conditioning research
pub_type： 临床试验,杂志文章,随机对照试验
doi：
更新日期：2002-05-01 00:00:00
abstract：UNLABELLED:Some recommendations suggest keeping the shank as vertical as possible during the barbell squat, thus keeping the knees from moving past the toes. This study examined joint kinetics occurring when forward displacement of the knees is restricted vs. when such movement is not restricted. Seven weight-trained m...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/1533-4287(2003)017<0629:eokpoh>2.0.co;2
更新日期：2003-11-01 00:00:00
abstract：:It is generally thought that topical cooling can interfere with blood perfusion and may have positive effects on recovery from a traumatic challenge. This study examined the influence of topical cooling on muscle damage markers and hemodynamic changes during recovery from eccentric exercise. Eleven male subjects (age ...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章,随机对照试验
doi：10.1519/JSC.0b013e318267a22c
更新日期：2013-05-01 00:00:00
abstract：:Stine, KA, Moxey, JR, Gilbertson, NM, Malin, SK, and Weltman, AL. Effects of feedback type and personality on 2,000-m ergometer performance in female varsity collegiate rowers. J Strength Cond Res 33(8): 2170-2176, 2019-Rowing performance is routinely tested on ergometers, involving visual cues and verbal encouragemen...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章,随机对照试验
doi：10.1519/JSC.0000000000002376
更新日期：2019-08-01 00:00:00
abstract：:The purpose of this study was to determine the effect of load on lower extremity biomechanics during the pull phase of the clean. Kinematic and kinetic data of the 3 joints of the lower extremity were collected while participants performed multiple sets of cleans at 3 percentages: 65, 75, and 85% of 1 repetition maxim...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0b013e3181da780b
更新日期：2011-05-01 00:00:00
abstract：:The purpose of this study was to analyze multiple effects of an extended interval training (EIT) protocol on countermovement jump (CMJ) and handgrip strength in endurance athletes and to determine the relationship between fatigue and potentiation. Thirty experienced sub-elite male long-distance runners (age = 28.26 ± ...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000000591
更新日期：2015-01-01 00:00:00
abstract：:Qiu, J, Huang, L, Davie, AJ, and Zhou, S. Comparison of the effects of endurance training on alternate days and on consecutive 4 days each week for 8 weeks on the abundance of PGC-1α, CaMKII, NRF-1, mtTFA, and COXIV proteins in rat skeletal muscle. J Strength Cond Res 33(11): 3136-3144, 2019-The aim of this study was ...
journal_title：Journal of strength and conditioning research
pub_type： 杂志文章
doi：10.1519/JSC.0000000000002407
更新日期：2019-11-01 00:00:00
