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Ian McGinnis, Justin Cobb, Ryan Tierney and Anne Russ

Introduction/Clinical Scenario Dizziness and imbalance are two of the most commonly-reported symptoms in the early stages of concussion. Anywhere from 23–81% of patients report dizziness in the days following injury. 1 – 3 An initial presentation of dizziness can be a predictor of prolonged

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Rahel Gilgen-Ammann, Wolfgang Taube and Thomas Wyss

Purpose:

To quantify gait asymmetry in well-trained runners with and without previous injuries during interval training sessions incorporating different distances.

Methods:

Twelve well-trained runners participated in 8 high-intensity interval-training sessions on a synthetic track over a 4-wk period. The training consisted of 10 × 400, 8 × 600, 7 × 800, and 6 × 1000-m running. Using an inertial measurement unit, the ground-contact time (GCT) of every step was recorded. To determine gait asymmetry, the GCTs between the left and right foot were compared.

Results:

Overall, gait asymmetry was 3.3% ± 1.4%, and over the course of a training session, the gait asymmetry did not change (F 1,33 = 1.673, P = .205). The gait asymmetry of the athletes with a previous history of injury was significantly greater than that of the athletes without a previous injury. However, this injury-related enlarged asymmetry was detectable only at short (400 m), but not at longer, distances (600–1000 m).

Conclusion:

The gait asymmetry of well-trained athletes differed, depending on their history of injury and the running distance. To detect gait asymmetries, high-intensity runs over relatively short distances are recommended.

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Micailah Brock and Sheri Huckleberry

This paper introduces the concept of dynamic isometrics in training athletes to improve core/postural-related movements while potentially decreasing the occurrence of injury manifested as lower back pain (LBP). Moreover, suggested resistance-training exercises are provided to guide the sport coach. Lower back pain is a common musculoskeletal injury that can be caused by imbalances between anterior and posterior muscle groups. Traditional exercises such as sit-ups and crunches are insufficient as preventatives because very few athletic movements are performed with weighted trunk flexion. Alternatively, sport coaches could implement dynamic isometric training, which closely reflects athletic activities, supports the principle of training specificity, improves balance and strength, and might decrease the occurrence of LBP (Hamlyn, Behm, & Young, 2007).

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Jennifer M. Medina McKeon and Patrick O. McKeon

rehabilitation for dizziness and imbalance following concussion: a critically appraised topic . Int J Athl Ther Train . 2019 ; 24 ( 3 ). doi:10.1123/ijatt.2018-0007 4. Booth M , Powell J , McKeon PO , Medina McKeon JM . Vestibular rehabilitation therapy for management of concussion: a critically

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Melissa Theige and Shannon David

apprehension, and (3) desire to preserve hip function. Intervention investigated All 4 patients underwent a 3-phase physical therapy protocol. Phase 1 addressed pain control, core stabilization, and movement pattern correction. Phase 2 focused on restoring ROM and correcting muscle strength imbalances. Phase 3

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Michael Kellmann, Maurizio Bertollo, Laurent Bosquet, Michel Brink, Aaron J. Coutts, Rob Duffield, Daniel Erlacher, Shona L. Halson, Anne Hecksteden, Jahan Heidari, K. Wolfgang Kallus, Romain Meeusen, Iñigo Mujika, Claudio Robazza, Sabrina Skorski, Ranel Venter and Jürgen Beckmann

individualized recovery is not achieved after training and functional overreaching, a continuous imbalance of inadequate recovery and excessive demands could initiate a cascade of deleterious conditions including underrecovery and nonfunctional overreaching (NFO). Underrecovery and NFO represent 2 closely

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Amy J. Hector and Stuart M. Phillips

calories too severely, particularly below 30 kcal/kg fat-free mass, which would be roughly equivalent to resting metabolic rate for most people ( Loucks et al., 2011 ). For example, in natural male body builders, prolonged low energy availability can result in loss of LBM, hormonal imbalances

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Kari Stefansen, Gerd Marie Solstad, Åse Strandbu and Maria Hansen

’re 16 and an athlete and the coach [approaches you] then you’re naive and don’t really know what to do. Then it’s much easier for mistakes to happen. I think so. Yes. (Boy, int. 12) These quotes highlight the ambiguities surrounding legal CASRs that are thought to contain a power imbalance due to the

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Sang-Ho Lee, Steven D. Scott, Elizabeth J. Pekas, Jeong-Gi Lee and Song-Young Park

restriction and high-intensity exercise, an imbalance between free radicals and antioxidants enzymes takes place, leading to oxidative stress. 5 When this occurs, MDA is produced, a highly reactive chemical and a commonly used marker for oxidative stress, as it induces lipid peroxidation of the cell membrane

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Barıs Seven, Gamze Cobanoglu, Deran Oskay and Nevin Atalay-Guzel

Isokinetic assessment provides determination of bilateral asymmetry and agonist–antagonist imbalance and assists in detecting these musculoskeletal injuries. 28 The reliability of the isokinetic dynamometer is essential for the correct interpretation of results. 12 Although there are many studies that use