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Gyms are rife with "gym science" (that ol' exercise lore barked from tight-sleeved lifters to loose-sleeved aspirants). Some of the cliches and mantres are true, or true-ish, and can be of value. But most of the barking reveals more confidence than competence, and it can be dangerous to employ that "wisdom" (e.g., "if you aren't throwin' up on leg day, you aren't trainin' hard 'nough!"). As scientific understanding progresses, we improve in our ability to distinguish the helpful advice from the harmful. That's my motivation for contributing what I can to the advancement of science through research. Below are my published studies: |
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#1. Just because a muscle group has been branded with the stamp of vanity (lookin' at you, biceps), that doesn't mean it isn't a critical contributor to athletic performance. If you want to know more, check out my study below: Marie R. Acosta, J. Mark VanNess, William P. Lydon, Brian G. Graham, Alexis C. King, Courtney D. Jensen. Biceps and Triceps Contribute to Pitching Performance in College Baseball. Presented at: 2019 ACSM National Conference, May 29, Orlando, FL. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000560688.68517.e9. 1) MSSE Webpage. 2) MSSE, 51(6): 65. 3) MSSE, 49(5): S50.  #2. Not all hours are born equal. Morning, noon, and night permit different performances. If you want to maximize your power output during a workout, try to produce that peak in the afternoon, between 2:00 and 4:00pm. If you want to know more, check out my study below: Marie R. Acosta, J. Mark VanNess, Alexia E. Amo, Courtney D. Jensen. Diurnal Sensitivity Of Muscle Force And Acceleration Parameters Of The Upper Limb. Presented at: 2020 ACSM National Conference, San Francisco, CA. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000675832.61337.0b. 1) MSSE Webpage. 2) MSSE, 52(7): 210. 3) MSSE, 52(5): S163-S164. #3. Power is fundamental to numerous sports. Training is fundamental to improvements in power. But how should we train? One thing to consider is the inter-repetition rest interval (IRRI). Especially with the upper limbs, if you give your tissues a 2.5-3.0 second rest period between repetitions, you're likely to achieve higher power output in the subsequent rep. If you want to know more, check out my (co-authored) study below: William P. Lydon, Marie R. Acosta, Alexia E. Amo, J. Mark VanNess, Courtney D. Jensen. Inter-Repetition Rest Interval Affects Peak Power Independent Of Its Rate Of Development. Presented at: 2020 ACSM National Conference, San Francisco, CA. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000682784.00245.c4. 1) MSSE Webpage. 2) MSSE, 52(7): 698-699. 3) MSSE, 52(5): S549-S550. #4. Fall risk predictors: Marie R. Acosta, Cynthia Villalobos, Patricia I. Jensen, Jessica L. Ruiz, Lewis E. Jacobson, Jonathan M. Saxe, J. Mark VanNess, Courtney D. Jensen. Fall Risk Analysis: Implications for Exercise Prescription Among Older Adults. Presented at: 2021 ACSM National Conference. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000763724.90876.71. 1) MSSE Webpage. 2) MSSE, 53(8): 384-385. #5. Does exercise environment affect enhancement of body composition? Not really. Exercise at all - whenever, wherever - seems to work: Gigi Lee, Marie R. Acosta, Matt Lazaro, Alexia E. Amo, Genevieve K. Humphrey, Courtney D. Jensen. Exercise Participation Is More Important Than Exercise Environment for Enhancement of Body Composition. Presented at: 2021 ACSM National Conference. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000759060.33579.c6. 1) MSSE Webpage. 2) MSSE, 53(8): 4. #6. Validation of blood and breath ketone assessment: Katherine D. Edelstein, Marie R. Acosta, Patric D. Buchanan, J. Mark VanNess, Courtney D. Jensen. Serial Testing of Blood and Breath Ketones: A Validation Study. Presented at: 2021 ACSM National Conference. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000762264.54863.eb. 1) MSSE Webpage. 2) MSSE, 53(8): 273. #7. As a bodybuilder progresses through cut phase, it's important to keep an eye on overtraining symptoms. Physiological strain appears to be more detectable in the morning, before starting your day: Vivian N. Truong, Marie R. Acosta, Thoren T. Bradley, Patricia I. Jensen, Courtney D. Jensen. Cardiometabolic Indicators of Excess Physiological Stress in a Professional Bodybuilder Detected Exclusively During Fasted Evaluation. Presented at: 2021 ACSM National Conference. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000759120.11866.55. 1) MSSE Webpage. 2) MSSE, 53(8): 8. #8. Motor function across the lifespan: Saejel G. Mohan, Thoren T. Bradley, Marie R. Acosta, Cynthia Villalobos, Courtney D. Jensen. Age and Motor Performance: An Analysis of Biomechanical Capacities Across the Lifespan. Presented at: 2021 ACSM National Conference. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000760584.97676.b6. 1) MSSE Webpage. 2) MSSE, 53(8): 124. #9. CrossFit and regular gym settings: do the exercisers age differently? A little bit: Brianna Simmerman, Jacob M. Cunha, Alexia E. Amo, Marie R. Acosta, Matt Lazaro, Courtney D. Jensen. The Effects of Age on Body Composition Differ Between Male and Female CrossFit Exercisers. Presented at: 2021 ACSM National Conference. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000759048.64941.39. 1) MSSE Webpage. 2) MSSE, 53(8): 3. #10. We know regularity of body composition assessment (even just stepping on the scale) is one of very few behaviors that predicts long-term weight loss. But are people with better body compositions inclined to test more often? And people with worse composition inclined to test less often? Maybe that explains part of the phenomenon: Jonathan A. Barry, Alexia E. Amo, Marie R. Acosta, Genevieve K. Humphrey, J. Mark VanNess, Matt Lazaro, Courtney D. Jensen. The Influence of Body Composition on Health Monitoring Behavior. Presented at: 2021 ACSM National Conference. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000763016.45441.90. 1) MSSE Webpage. 2) MSSE, 53(8): 328-329. #11. Hydration may be suboptimal in college athletes. Controlling for sex, age, bodyweight, height, and body fat percent college athletes had significantly lower intracellular and extracellular hydration than CrossFit participants. It may be wise for college athletes to focus on hydration... and lay off the fraternity liquor: Marie R. Jensen, Nathaniel J. Holmgren, Matt Lazaro, Nickolas S. Rahawi, Genevieve K. Humphrey, Courtney D. Jensen. CrossFit Participants and Collegiate Athletics Exhibit Consistent Differences in Hydration Parameters. Presented at: 2022 ACSM National Conference. Published in: Medicine & Science in Sports & Exercise. DOI: 10.1249/01.mss.0000877416.35465.2b. 1) MSSE Webpage. 2) MSSE, 54(9): 188.  #12. Ketone levels don't fluctuate much during a ketogenic cut phase as a dieting bodybuilder undergoes minor changes in nutrition and hydration: Aida V. Novoa, Marie R. Jensen, Patric Buchanan, Nathaniel J. Holmgren, Isabel A. Terra, Courtney D. Jensen. Blood and Breath Ketones Demonstrate Acute Insensitivity to Daily Nutritional Variation in Keto-Adapted Female Bodybuilder. Presented at: 2022 ACSM National Conference. Published in: Medicine & Science in Sports & Exercise. DOI: 110.1249/01.mss.0000880176.44230.7c. 1) MSSE Webpage. 2) MSSE, 54(9): 407. #13. Personal trainers should never write meal plans for their clients... at least according to the law: Marie R. Jensen, J. Mark Van Ness, Margaret E. Ciccolella. (2022). The Exercise Physiologist/Nutrition Counselor: Duty of Care and Scope of Practice. Professionalization of Exercise Physiology Online, 25(2): 1-9. #14: Marie R. Jensen, Jazmin Trevino, Addisen Azevedo, Nathaniel J. Holmgren, J. Mark VanNess, Bryan Bannister, Courtney D. Jensen. (2023). Female Collegiate Athletes and CrossFit Exercisers Exhibit Muscular Differences During Body Composition Testing. Medicine & Science in Sports & Exercise, In Press. #15: Bryan S. Bannister, Marie R. Jensen, Addisen S. Azevedo, Alex Roque, Alexis Molgaard, Nathaniel J. Holmgren, J. Mark VanNess, Courtney D. Jensen. (2023). Anthropometric Differences Between Male Division-1 Collegiate Athletes and CrossFit Exercisers. Medicine & Science in Sports & Exercise, In Press. #16: Allison Louie, Marie R. Jensen, Courtney D. Jensen. (2023). The Influence of Subject Leanness on Statistical Agreement of Fit3D Parameters During Serial Scans. Medicine & Science in Sports & Exercise, In Press. #17: Addisen S. Azevedo, Courtney D. Jensen, Marie R. Jensen. (2023). The Effects of Hydration on Anthropometric Reports Generated by the Fit3D Body Scanner. Medicine & Science in Sports & Exercise, In Press. |