The daily energy requirements of tactical personnel are highly variable, depending on gender, body composition, activities performed, age, and environmental conditions.

In this session from the 2015 NSCA National Conference, Nelson Ayotte—the Strength and Conditioning Coach for the St. Louis Blues National Hockey League (NHL) team—explains how to design and implement a specific energy systems program at the elite level. Ayotte demonstrates the characteristics of each of the three energy systems and their trainability, and explores how to understand the energy demands of a sport by analysis of its characteristics, competition intensity, and duration of efforts and recovery periods.

This NSCA Coach article provides a proposes a framework for standardizing SEB resistance training based on principles of kinetic and potential energy. Visit NSCA online to read more on exercise science and sport performance.

This NSCA Coach article aims to equip coaches, athletic trainers, and support staff with the knowledge and tools necessary to manage REDs among college athletes. Visit NSCA online to read more on mental health and sport performance.

This article in NSCA Coach shares a research-driven framework for dryland training in competitive swimming. Visit us online to learn more on sport performance and exercise science.

This excerpt briefly describes the different energy systems used by structural and wildland firefighters.

This article will highlight recent key dietary practices and provide practical applications for implementing these practices for firefighters.

No two days are the same for Will Gilmore as part of a team that oversees over 800 athletes across 200 sports at the Red Bull Athlete Performance Center. From surfers to skydivers, the facility provides an elite high-performance ecosystem for traditionally individual sport athletes. Gilmore highlights the need for remote programming and monitoring to support a constantly shifting roster. Together as a team, they navigate uncharted territory in action sports conditioning, guided by physiological demands and underlying energy systems. Gilmore and NSCA Coaching and Sport Science Program Manager Eric McMahon discuss the shift in sport science from ample to actionable data to find, change, and measure what matters most. Gilmore reflects on his “career periodization” and having free time for friends and family while working corporate hours — a stark contrast with his background in Major League Baseball (MLB). The pair also emphasize proactive networking and education for future career opportunities. Connect with Will on Instagram: @will_gilmore_ or LinkedIn: @will-gilmore | Find Eric on Instagram: @ericmcmahoncscs or LinkedIn: @ericmcmahoncscs Want to get involved with the NSCA? Find peers who share your passion for a specific sport or topic in Special Interest Groups (SIGs), or apply now for Volunteer Leadership Opportunities!

The physiological response to breath holding includes bradycardia and peripheral vasoconstriction, which contrasts with that of exercise which includes tachycardia and peripheral vasodilation. This raises the question as to what the physiological response is to breath holding during exercise. During low-intensity exercise, the breath holding response of bradycardia and peripheral vasoconstriction prevails over the exercise response of tachycardia and peripheral vasodilation, but nevertheless the exercise may be sustained. Due to the lack of availability of extrinsic oxygen (O 2 ) from the atmosphere during breath holding, the energy demands can be met by increased reliance on intrinsic O 2 stores (i.e., O 2 that was in the body before the breath hold) via increased O 2 extraction at the muscle compared with exercise while breathing, or increased contributions from anaerobic energy systems. During high intensity exercise of short duration, the exercise response may prevail over the breath holding response due to the increased parasympathetic withdrawal and sympathetic drive of higher intensity exercise. If breath holding during high-intensity exercise was sustained for long enough, the breath holding response may eventually overcome the exercise response, although this may be difficult due to the inverse relationship between exercise intensity and breath hold duration.

Knowledge of metabolic rate can help athletes as well as health-conscious people improve their exercise performance or obtain the fat-to-lean-mass ratio optimal for their personal situations. Two examples of how this works follow.