Personal Training Quarterly is digitally published four times a year. Look for articles and information on how you can expand your personal training career through integrating training methods and accessing tools for building your business. You must be a member of the NSCA to access the PTQ.

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.

Learn about the education and experience requirements for the Certified Performance and Sport Scientist certification. The NSCA's CPSS requirements allow for three different eligibility routes based on your level of post-secondary education.

NSCA has a network of volunteer leaders who direct NSCA’s efforts at the state level. NSCA’s Midwest Regional Coordinator provides oversight and training to local state directors. Members in the Midwest Region can connect at local and regional events as well as on Facebook to others in this area.

The benefits of resistance training are almost overwhelming, however, too few older adults participate in resistance training, largely because of fear, confusion, and lack of consensus to guide implementation. It is the hope that this position statement may have a positive impact addressing these issues and on empowering healthier aging.

The Sports Medicine/Rehabilitation Specialist Award is given to a sports medicine professional whose work and contributions have significantly impacted the field of sports medicine or rehabilitation for athletes.

Get NSCA's Essentials of Training Special Populations — a trusted resource for students, personal trainers, exercise science professionals, and CSPS® exam prep.

Click on a link below to access a reference copy of the associated quiz.

Learn about sport science careers and the CPSS certification program​.

The NSCA Bylaws outlines how the organization operates and is governed. The current bylaws have been amended and restated as of July 10, 2020.