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Anthony Birat, Yoann M. Garnier, Pierre Bourdier, Alexis Dupuy, Alexandre Dodu, Claire Grossoeuvre, Anne-Charlotte Dupont, Anthony J. Blazevich, Mélanie Rance, Claire Morel, Stéphane Nottin, and Sébastien Ratel

, while other modalities such as kayaking allow for relief from lower body exercise and thus minimize lower-limb neuromuscular fatigue ( 40 ). However, while such races may impose significant physiological and psychological demands on the athletes, the neuromuscular consequences of mixed-modality long

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Daria Neyroud, Jimmy Samararatne, Bengt Kayser, and Nicolas Place

evaluated the extent and etiology of KE neuromuscular fatigue induced by dynamic exercise (repeated squat jumps) with and without concomitant NMES. We hypothesized that the addition of NMES to repeated squat jumps would exacerbate peripheral fatigue. Methods Participants Nine healthy, recreationally active

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Cédric Leduc, Jason Tee, Mathieu Lacome, Jonathon Weakley, Jeremy Cheradame, Carlos Ramirez, and Ben Jones

reluctance, as well as perceived risk of injury. 2 , 6 Jump tests may also not be specific enough to capture the actual level of fatigue induced by training sessions or games due to the horizontal nature of displacements in team sport. 7 Methods of neuromuscular fatigue monitoring need to evolve to allow

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Rihab Borji, Firas Zghal, Nidhal Zarrouk, Sonia Sahli, and Haithem Rebai

and the subsequent recovery kinetic ( Hunter, Critchlow, Shin, & Enoka, 2004 ; Ratel et al., 2015 ). Therefore, it is important to consider the fatigue profile of individuals with ID and their ability to tolerate fatiguing exercises. Neuromuscular fatigue is defined as an exercise-related decrease in

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Joel Garrett, Stuart R. Graham, Roger G. Eston, Darren J. Burgess, Lachlan J. Garrett, John Jakeman, and Kevin Norton

Monitoring neuromuscular fatigue (NMF) in a sport-specific activity itself has been suggested as the most optimal method for monitoring NMF status. 1 Modified field tests of neuromuscular function have been implemented due to the impractical nature of simulating sports activity, which can impede

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Timo B. van den Bogaard, Jabik-Jan Bastiaans, and Mathijs J. Hofmijster

increased anaerobic energy supply. 3 , 4 Despite these favorable long-term effects of RT on rowing performance, acute neuromuscular fatigue (NMF) following even a single bout of RT may potentially interfere with training effects of subsequent training sessions, 5 irrespective of training background, and

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George Wehbe, Tim Gabbett, Dan Dwyer, Christopher McLellan, and Sam Coad

Purpose:

To compare a novel sprint test on a cycle ergometer with a countermovement-jump (CMJ) test for monitoring neuromuscular fatigue after Australian rules football match play.

Methods:

Twelve elite under-18 Australian rules football players (mean ± SD age 17.5 ± 0.6 y, stature 184.7 ± 8.8 cm, body mass 75.3 ± 7.8 kg) from an Australian Football League club’s Academy program performed a short sprint test on a cycle ergometer along with a single CMJ test 1 h prematch and 1, 24, and 48 h postmatch. The cycle-ergometer sprint test involved a standardized warm-up, a maximal 6-s sprint, a 1-min active recovery, and a 2nd maximal 6-s sprint, with the highest power output of the 2 sprints recorded as peak power (PP).

Results:

There were small to moderate differences between postmatch changes in cycle-ergometer PP and CMJ PP at 1 (ES = 0.49), 24 (ES = –0.85), and 48 h postmatch (ES = 0.44). There was a substantial reduction in cycle-ergometer PP at 24 h postmatch (ES = –0.40) compared with 1 h prematch.

Conclusions:

The cycle-ergometer sprint test described in this study offers a novel method of neuromuscular-fatigue monitoring in team-sport athletes and specifically quantifies the concentric component of the fatigue-induced decrement of force production in muscle, which may be overlooked by a CMJ test.

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Katja Tomazin, Jean-Benoit Morin, and Guillaume Y. Millet

Purpose:

To compare neuromuscular fatigue induced by repeated-sprint running vs cycling.

Methods:

Eleven active male participants performed 2 repeated-maximal-sprint protocols (5×6 s, 24-s rest periods, 4 sets, 3 min between sets), 1 in running (treadmill) and 1 in cycling (cycle ergometer). Neuromuscular function, evaluated before (PRE); 30 s after the first (S1), the second (S2), and the last set (LAST); and 5 min after the last set (POST5) determined the knee-extensor maximal voluntary torque (MVC); voluntary activation (VA); single-twitch (Tw), high- (Db100), and low- (Db10) frequency torque; and maximal muscle compound action potential (M-wave) amplitude and duration of vastus lateralis.

Results:

Peak power output decreased from 14.6 ± 2.2 to 12.4 ± 2.5 W/kg in cycling (P < .01) and from 21.4 ± 2.6 to 15.2 ± 2.6 W/kg in running (P < .001). MVC declined significantly from S1 in running but only from LAST in cycling. VA decreased after S2 (~–7%, P < .05) and LAST (~–9%, P < .01) set in repeated-sprint running and did not change in cycling. Tw, Db100, and Db10/Db100 decreased to a similar extent in both protocols (all P < .001 post-LAST). Both protocols induced a similar level of peripheral fatigue (ie, low-frequency peripheral fatigue, no changes in M-wave characteristics), while underlying mechanisms probably differed. Central fatigue was found only after running.

Conclusion:

Findings about neuromuscular fatigue resulting from RS cycling cannot be transferred to RS running.

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Theofanis Tzatzakis, Konstantinos Papanikolaou, Dimitrios Draganidis, Panagiotis Tsimeas, Savvas Kritikos, Athanasios Poulios, Vasiliki C. Laschou, Chariklia K. Deli, Athanasios Chatzinikolaou, Alexios Batrakoulis, Georgios Basdekis, Magni Mohr, Peter Krustrup, Athanasios Z. Jamurtas, and Ioannis G. Fatouros

strength of knee extensors (KE) and knee flexors (KF) of the dominant limb (DL) and nondominant limb (NDL) was evaluated at 1-, 2- and 3-hour post-SEPT as a measure of neuromuscular fatigue. Performance (jumping, strength, and speed), DOMS, and CK activity were measured preexercise, postexercise, and daily

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Anthea C. Clarke, Judith M. Anson, and David B. Pyne

Purpose:

To examine relationships between on-field game movement patterns and changes in markers of neuromuscular fatigue and muscle damage during a 2-d women’s rugby sevens tournament.

Methods:

Female national (mean ± SD n = 12, 22.3 ± 2.5 y, 1.67 ± 0.04 m, 65.8 ± 4.6 kg) and state (n = 10, 24.4 ± 4.3 y, 1.67 ± 0.03 m, 66.1 ± 7.9 kg) representative players completed baseline testing for lower-body neuromuscular function (countermovement-jump [CMJ] test), muscle damage (capillary creatine kinase [CK]), perceived soreness, and perceived recovery. Testing was repeated after games on days 1 and 2 of the tournament. GPS (5-Hz) data were collected throughout the tournament (4−6 games/player).

Results:

National players were involved in greater on-field movements for total time, distance, high-speed running (>5 m/s), and impacts >10 g (effect size [ES] = 0.55−0.97) and displayed a smaller decrement in performance from day 1 to day 2. Despite this, state players had a much greater 4-fold increase (ΔCK = 737 U/L) in CK compared with the 2-fold increase (ΔCK = 502 U/L) in national players (ES = 0.73). Both groups had similar perceived soreness and recovery while CMJ performance was unchanged. High-speed running and impacts >10 g were largely correlated (r = .66−.91) with ΔCK for both groups.

Conclusion:

A 2-day women’s rugby sevens tournament elicits substantial muscle damage; however, there was little change in lower-body neuromuscular function. Modest increases in CK can largely be attributed to high-speed running and impacts >10 g that players typically endure.