Considering the great popularity of eccentric-based training, the purpose of this review is to first provide the scientific rationale for its use; second, summarize the eccentric-based training modalities that can be used; and finally, offer practical recommendations on how to implement eccentricbased modalities to enhance sports performance. The molecular and neural mechanisms underlying eccentric actions are partially distinct from those of concentric and isometric actions. During eccentric actions, theories suggest a strain-induced modulation of actin-myosin interactions at the crossbridge level, activation of structural protein titin, and winding of titin on actin. Eccentric acute physiological responses differ from concentric exercise responses, including variations in neuromuscular, metabolic, hormonal, and anabolic signaling. Eccentric training elicits greater improvements in muscle strength, power, and stretch-shortening cycle function compared with concentric-only or traditional resistance training. Therefore, eccentric-based training can lead to unique neuromuscular (e.g., improved coordination of motor units) and morphological (e.g., increased muscle fascicle length and enhanced distal cross-sectional area) adaptations that could play a key role in sport performance. Practitioners may implement eccentric exercises with external loads, fully eccentric-based exercises (e.g., Nordic hamstring curl), accentuated eccentric loading, flywheel resistance exercise, and plyometrics to develop specific physical adaptations in line with their goals. Eccentric work (e.g., for hamstrings) can be obtained during other exercises such as downhill running tasks, decelerations, and sprinting activities. Practitioners need to be aware that no single “silver bullet” training modality exists; consequently, practitioners should use a combination of eccentric-based training approaches with their athletes to obtain the desired adaptations.

Prepare for your CSCS® exam with confidence. Explore study timelines, optional NSCA Exam Prep resources, and community support through our clinics and Prep Group.

Recent research has developed new ways of approaching macronutrient ratios that challenge the conventional way of thinking. This article takes a look at what is usually recommended for athletes, as well as different lower carbohydrate variations.

Certified Special Population Specialists® (CSPS®) are fitness professionals who, using an individualized approach, assess, motivate, educate, and train special population clients, including those with chronic and temporary health conditions. Become a certified personal trainer, then pursue this advanced personal trainer certification. CSPS® individuals train clients with medical conditions such as metabolic disease, autoimmune disorders, cancer and cardiac arrest, and address the needs of prenatal and postpartum personal training clients.

This article from the TSAC Report shares dietary guidance, customized exercise programs, and strategies for integrating whole health for veterans. Visit NSCA online to learn more about exercise science.

Consumption of dietary protein by athletes is a common intervention to maximize gains in muscle and strength, and to improve body composition. The purpose of this article is to analyze the current research on the optimal amount of dietary protein for resistance training athletes.

When putting together a comprehensive training program for firefighters, Jill Craig looks at three things: fitness, wellness and medical surveillance, in that order. Join Jill as she talks about how the Austin Fire Department outlines its training model. From the 2014 TSAC Conference.

Darcie Burde, Assistant Director for Fitness at University of Florida, demonstrates how to translate movement assessments into training clients from all walks of life.