The TSAC Report is the NSCA’s quarterly, online-only publication designed for the training of tactical professionals, operators, and facilitators. You must be a member of the NSCA to access the TSAC Report.

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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.

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The Private Sector Coach of the Year Award, previously known as the Personal Trainer of the Year Award, recognizes an NSCA-certified professional working in the private sector who demonstrates exceptional impact in client outcomes, application of evidence-based practices, advocacy for the strength and conditioning profession, and significant contributions to the NSCA.

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The Council on Accreditation of Strength and Conditioning Education, commonly referred to as CASCE, is a nonprofit accrediting agency devoted to advancing the strength and conditioning profession. We provide accreditation to collegiate-level education programs specializing in strength and conditioning. We rely on peer-reviews by academic and industry professionals to assess standards of quality, ensuring relevant curriculum and effective instruction.