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Yanita McLeay, Stephen R Stannard, Toby Mundel, Andrew Foskett and Matthew Barnes

This study was designed to investigate the effects of alcohol consumption on recovery of muscle force when consumed immediately postexercise in young females. Eight young women completed 300 maximal eccentric actions of the quadriceps femoris muscle on an isokinetic dynamometer on two occasions in a randomized, cross-over design after which an alcoholic beverage (0.88g ethanol/kg body weight) or an iso-caloric placebo was consumed. Maximal isokinetic (concentric and eccentric) torque and isometric tension produced across the knee were measured in both the exercised and control leg predamage, 36 hr post, and 60 hr post damage. Venous blood creatine kinase (CK) activity and muscle soreness ratings were taken before damage and once per day to 60 hr post damage. Significant differences were observed between the exercised and control leg for maximal concentric, and eccentric torque and isometric tension (p < .05). A near significant Treatment × Time interaction was observed for isometric tension (p = .077), but not for concentric or eccentric torque. No main effects of treatment (alcohol) or interactions with Time × Leg or Leg × Treatment were observed. Perceived muscle soreness during box stepping and squatting showed significant time effects (p < .05), and CK activity did not significantly change. Our results indicate that the consumption of 0.88g ethanol/kg body weight following eccentric exercise-induced muscle damage does not affect recovery in the days following damage in females.

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Elizabeth Thompson, Theo H. Versteegh, Tom J. Overend, Trevor B. Birmingham and Anthony A. Vandervoort

Our purpose was to describe heart rate (HR), mean arterial blood pressure (MAP), and perceived exertion (RPE) responses to submaximal isokinetic concentric (CON) and eccentric (ECC) exercise at the same absolute torque output in older adults. Peak torques for ECC and CON knee extension were determined in healthy older males (n = 13) and females (n = 7). Subjects then performed separate, randomly ordered, 2-min bouts of CON and ECC exercise. Heart rate and MAP increased (p < .001) from resting values throughout both exercise bouts. CON exercise elicited a significantly greater cardiovascular response than ECC exercise after 60 s. Peak HR, MAP, and RPE after CON exercise were greater than after ECC exercise (p < .01). At the same absolute torque output, isokinetic CON knee extension exercise resulted in a significantly greater level of cardiovascular stress than ECC exercise. These results are relevant to resistance testing and exercise in older people.

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Eduardo Lusa Cadore, Miriam González-Izal, Rafael Grazioli, Igor Setuain, Ronei Silveira Pinto and Mikel Izquierdo

hamstring and quadriceps strength (ie, concentric and eccentric) and resistance to fatigue are important mechanisms for improving functional knee status in high level and recreational athletes. 3 Eccentric strength training has been demonstrated to be a substantial intervention for promoting neuromuscular

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Mathieu Lacome, Simon Avrillon, Yannick Cholley, Ben M. Simpson, Gael Guilhem and Martin Buchheit

large-to-very large increases in knee-flexor strength (13%–78%) in recreational athletes. 11 Very large increases in BFlh fascicle length (∼14%, range 5%–34%) were also reported following eccentric training. 12 However, these protocols included high-volume training (2–3 times/wk, 30–50 repetitions

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Chunbo Liu

Eccentric cycling was first introduced in 1952, 1 where 2 interlinked bicycles were used with one person pedaling forward (ie, concentric) and the other resisting the backward movements (ie, eccentric) imposed on the bicycle. Since then, researchers have been intrigued by the observation that

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Richard A. Brindle, David Ebaugh and Clare E. Milner

Weakness of hip abductor muscles during eccentric loading and associated medial collapse have been hypothesized as an etiology of overuse and noncontact injuries, such as patellofemoral pain syndrome 1 and anterior cruciate ligament tears. 2 Furthermore, hip abductor muscle eccentric

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Zachary M. Gillen, Lacey E. Jahn, Marni E. Shoemaker, Brianna D. McKay, Alegra I. Mendez, Nicholas A. Bohannon and Joel T. Cramer

Vertical jump tests are among the most popular assessments of lower-body power for athletes. 1 – 6 Arguably, the most popular and common vertical jump test is the countermovement jump (CMJ). The CMJ involves a downward, eccentric movement followed by a rapid, maximal, upward, concentric vertical

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Talita Molinari, Tainara Steffens, Cristian Roncada, Rodrigo Rodrigues and Caroline P. Dias

). Muscular actions present in most strength exercises may be isometric, concentric, and eccentric, which present distinct physiological, neural, and mechanical parameters ( Meylan, Cronin, & Nosaka, 2008 ), with the training protocol possibly being composed exclusively of one type of contraction. Many

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Luis Peñailillo, Karen Mackay and Chris R. Abbiss

attempted to concurrently examine both effort and exertion during exercise, 24 , 25 and thus the possible difference between these variables is not well understood. Lengthening muscle contractions (often referred to as eccentric [ECC] contractions) 26 are performed during typical daily activities (ie

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Justin W.Y. Lee, Ming-Jing Cai, Patrick S.H. Yung and Kai-Ming Chan

-third of all muscle injuries in elite soccer. 1 , 2 Previous studies suggested lower hamstring eccentric strength in the preseason increased the risk of future HSI. 3 – 6 Several large cohort studies revealed that modifying hamstring muscle strength through eccentric strength training exercises