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Quantifying Neuromuscular Fatigue Induced by an Intense Training Session in Rugby Sevens

Bruno Marrier, Yann Le Meur, Julien Robineau, Mathieu Lacome, Anthony Couderc, Christophe Hausswirth, Julien Piscione, and Jean-Benoît Morin

Purpose:

To compare the sensitivity of a sprint vs a countermovement-jump (CMJ) test after an intense training session in international rugby sevens players, as well as analyze the effects of fatigue on sprint acceleration.

Methods:

Thirteen international rugby sevens players completed two 30-m sprints and a set of 4 repetitions of CMJ before and after a highly demanding rugby sevens training session.

Results:

Change in CMJ height was unclear (–3.6%; ±90% confidence limits 11.9%. Chances of a true positive/trivial/negative change: 24/10/66%), while a very likely small increase in 30-m sprint time was observed (1.0%; ±0.7%, 96/3/1%). A very likely small decrease in the maximum horizontal theoretical velocity (V0) (–2.4; ±1.8%, 1/4/95%) was observed. A very large correlation (r = –.79 ± .23) between the variations of V0 and 30-m-sprint performance was also observed. Changes in 30-m sprint time were negatively and very largely correlated with the distance covered above the maximal aerobic speed (r = –.71 ± .32).

Conclusions:

The CMJ test appears to be less sensitive than the sprint test, which casts doubts on the usefulness of a vertical-jump test in sports such as rugby that mainly involve horizontal motions. The decline in sprint performance relates more to a decrease in velocity than in force capability and is correlated with the distance covered at high intensity.

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Self-Reported Physical Fitness of Older Persons: A Substitute for Performance-Based Measures of Physical Fitness?

Marieke J.G. van Heuvelen, Gertrudis I.J.M. Kempen, Johan Ormel, and Mathieu H.G. de Greef

To evaluate the validity of self-report measures of physical fitness as substitutes for performance-based tests, self-reports and performance-based tests of physical fitness were compared. Subjects were a community-based sample of older adults (N = 624) aged 57 and over. The performance-based tests included endurance, flexibility, strength, balance, manual dexterity, and reaction time. The self-report evaluation assessed selected individual subcomponents of fitness and used both peers and absolute standards as reference. The results showed that compared to performance-based tests, the self-report items were more strongly interrelated and they less effectively evaluated the different subdomains of physical fitness. Corresponding performance-based tests and self-report items were weakly to moderately associated. All self-report items were related most strongly with the performance-based endurance test. Apparently. older people tend to estimate overall fitness, in which endurance plays an important part, rather than individual subcomponents of Illness. Therefore, the self-report measures have limited validity as predictors of performance-based physical fitness.

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Test–Retest Reliability of Soccer Dribbling Tests in Children

Michael J. Duncan, Darren Richardson, Rhys Morris, Emma Eyre, and Neil D. Clarke

have been employed to quantify aspects of soccer skill (see Ali, 2011 for a review). Reliability and validity data for the majority of these tests are available for adults, and while there is some work that has examined reliability of some specific soccer skill tests in adolescents ( Mitrotasios

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Clinical Breathing Mechanics Differ Based on Test and Position

Hannah Horris, Barton E. Anderson, R. Curtis Bay, and Kellie C. Huxel Bliven

pattern during the clinical examination. 1 However, challenges exist regarding how to effectively and efficiently assess breathing patterns in a clinical setting using validated and reliable tests. Two commonly used clinical assessments of breathing are the Hi-lo test and LRE test. 1 The Hi-lo test is an

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Test–Retest Reliability of Student-Administered Health-Related Fitness Tests in School Settings

Brendan T. O’Keeffe, Alan E. Donnelly, and Ciaran MacDonncha

, 41 ). Health-related physical fitness can be objectively and accurately measured in laboratory settings by qualified technicians using sophisticated instruments. However, as indicated by Espana-Romero et al ( 13 ), such tests are not feasible for administration at population level. Field-based tests

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Reliability of Alpine Ski Racing-Specific Field Test: The 80s-Slide-Test

Valentin Bottollier, Matt R. Cross, Nicolas Coulmy, Loïc Le Quellec, and Jacques Prioux

To improve performance and to reduce injury risks, coaches and trainers need to use physical tests, which must be physiologically specific and reliable. 1 To the best of our knowledge, no study has demonstrated for alpine ski racing the physiological specificity and reliability of such a test

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Combined Neurocognitive and Exercise Tolerance Testing Improves Objectivity of Buffalo Concussion Treadmill Test

Daniel Miner and Brent Harper

, vestibular, and autonomic). Current consensus guidelines for RTP following SRC advocate graded exposure to exercise of increasing intensity while avoiding significant symptom exacerbation. 5 The Buffalo Concussion Treadmill Test (BCTT) is a graded exercise test, based on the Balke 7 protocol, designed to

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Strength and Power Testing of Athletes: A Multicenter Study of Test–Retest Reliability

Kolbjørn Lindberg, Paul Solberg, Thomas Bjørnsen, Christian Helland, Bent Rønnestad, Martin Thorsen Frank, Thomas Haugen, Sindre Østerås, Morten Kristoffersen, Magnus Midttun, Fredrik Sæland, Ingrid Eythorsdottir, and Gøran Paulsen

and weaknesses of athletes. 1 , 3 However, the usefulness of these assessments is highly dependent on the test–retest reliability, 2 , 4 , 5 , 7 – 10 which highlights a concern in the field of practice with high-performing athletes where the frequent use of testing is burdened by a myriad of methods

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Test–Retest Reliability of 3 Specific Strength Tests in Professional Handball Players

Maria Dolores Morenas-Aguilar, Luis J. Chirosa Rios, Angela Rodriguez-Perea, Juan Antonio Vázquez Diz, Ignacio J. Chirosa Rios, José Fernando Vera Vera, Lorenzo Ruiz-Orellana, and Daniel Jerez-Mayorga

commonly unilateral and could produce different neuromuscular adaptations and determined asymmetries. 7 In most cases, general tests with vertical vectors, single-plane, and single-joint movements (eg, bench press, squats, knee extension) are not sensitive and do not reflect relevant information about

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Clinical Diagnostic Tests Versus MRI Diagnosis of ACL Tears

Megan P. Brady and Windee Weiss

clinical diagnostic tests and magnetic resonance imaging (MRI) is debatable. 1 , 3 – 6 Because of the frequency of knee injury, 3 MRI is a common diagnostic tool used for imaging and diagnosis. 5 ACL tears are also diagnosed using clinical diagnostic tests. 1 , 3 – 6 Patient outcomes are dependent on a