Education
2013 Ph.D. Kinesiology - Exercise Physiology
Pennsylvania State University, University Park, PA
2008 B.S. Kinesiology & Spanish (double major)
Gordon College, Wenham, MA
Pennsylvania State University, University Park, PA
2008 B.S. Kinesiology & Spanish (double major)
Gordon College, Wenham, MA
Professional Experience
2013- 2015 Postdoctoral Scholar, Women's Health and Exercise Laboratories
Department of Kinesiology, Penn State University, University Park, PA 2016-2017 Adjunct Faculty Member, Bachelor of Science in Health Science Program, School of Health Science, Stockton University, Galloway, NJ 2015-2019 Research Support (Part-time), Women's Health and Exercise Laboratories Department of Kinesiology, Penn State University, University Park, PA 2018-Present Adjunct Lecturer, Department of Kinesiology, Penn State Harrisburg, Middletown, PA |
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Certifications
2011-Present International Society for Clinical Densitometry (ISCD) Bone Densitometry Technologist
Publications
Peer-Reviewed Publications
Click here to access publications on PubMed.
De Souza MJ, Mallinson RJ, Strock NCA, Koltun KJ, Olmsted MP, Ricker EA, Scheid JL, Allaway HC, Mallinson DJ, Kuruppumullage Don P, and Williams NI. Randomized controlled trial of the effects of increased energy intake on menstrual recovery in exercising women with menstrual disturbances: The "REFUEL" Study. Human Reproduction 2021.
Strock NCA, Koltun KJ, Mallinson RJ, Williams NI, and De Souza MJ. Characterizing the resting metabolic rate ratio in ovulatory exercising women over 12 months. Scandinavian Journal of Medicine and Science in Sport 2020; 30(8): 1337-1347.
Mallinson RJ, Southmayd EA, and De Souza MJ. Geometric and “true” densitometric characteristics of bones in athletes with stress fracture and menstrual disturbances: A systematic review. Sports Medicine2019; 49(7):1059-1078.
Southmayd EA, Williams NI, Mallinson RJ,and De Souza MJ. Energy deficiency suppresses bone turnover in exercising women with menstrual disturbances. Journal of Clinical Endocrinology and Metabolism2019.
Williams NI, Mallinson RJ, and De Souza MJ. Rationale and study design of an intervention of increased energy intake in women with exercise-associated menstrual disturbances to improve menstrual function and bone health: The REFUEL Study. Contemporary Clinical Trials Communications2019; 14: 100325.
Southmayd EA, Mallinson RJ, Williams NI, Mallinson, DJ, and De Souza MJ. Unique effects of energy versus estrogen deficiency on multiple components of bone strength in exercising women. Osteoporosis International 2017; 28(4): 1365-1376.
Koehler K, Williams NI, Mallinson RJ, Southmayd EA, and De Souza MJ. Low resting metabolic rate in exercise-associated amenorrhea is not due to a reduced proportion of highly active metabolic tissue compartments. American Journal of Physiology - Endocrinology and Metabolism 2016; 311(2): E480-487.
Mallinson RJ, Williams NI, Gibbs JC, Allaway HC, Koehler K, Southmayd EA, and De Souza MJ. Current and past menstrual status is an important determinant of femoral neck geometry in exercising women. Bone 2016 (In Press; Accepted January 2016).
Reed JL, De Souza MJ, Mallinson RJ, Scheid JL, and Williams NI. Energy availability discriminates clinical menstrual status in exercising women. Journal of the International Society of Sports Nutrition 2015; 12: 11.
Allaway HC, Williams NI, Mallinson RJ, Koehler K, and De Souza MJ. Reductions in urinary collection frequency for assessment of reproductive hormones provide physiologically representative exposure and mean concentrations when compared with daily collection. American Journal of Human Biology 2014 [Epub ahead of print].
Mallinson RJ and De Souza MJ. Current perspectives on the etiology and manifestation of the "silent" component of the Female Athlete Triad. International Journal of Women's Health 2014; 6: 451-467.
Joy E, De Souza MJ, Nattiv A, Misra M, Williams NI, Mallinson RJ, Gibbs JC, Olmsted M, Goolsby M, Matheson G, Barrack M, Burke L, Drinkwater B, Lebrun C, Loucks AB, Mountjoy M, Nichols J, Borgen JS. 2014 Female Athlete Triad Coalition Consensus Statement on Treatment and Return to Play of the Female Athlete Triad. Current Sports Medicine Reports 2014; 13(4): 219-232.
De Souza MJ, Nattiv A, Joy E, Misra M, Williams NI, Mallinson RJ, Gibbs JC, Olmsted M, Goolsby M, Matheson G. 2014 Female Athlete Triad Coalition Consensus Statement on Treatment and Return to Play of the Female Athlete Triad: 1st International Conference held in San Francisco, CA May 2012 and 2nd International Conference held in Indianapolis, IN, May 2013. British Journal of Sports Medicine 2014; 48(4): 289. AND Clinical Journal of Sports Medicine 2014; 24(2): 96-119.
Mallinson RJ, Williams NI, Olmsted MP, Scheid JL, Riddle ES, and De Souza MJ. A case report of recovery of menstrual function following a nutritional intervention in two exercising women with amenorrhea of varying duration. Journal of the International Society of Sports Nutrition 2013; 10(1): 34.
Mallinson RJ, Williams NI, Hill BR, and De Souza MJ. Body composition and reproductive function exert unique influences on indices of bone health in exercising women. Bone 2013; 56(1): 91-100.
Gibbs JC, Williams NI, Mallinson RJ, Reed JL, Rickard AD, and De Souza MJ. Effect of high dietary restraint on energy availability and menstrual status. Medicine and Science in Sports and Exercise 2013; 45(9): 1790-1797.
Toombs RJ, Ducher G, Shepherd J, and De Souza MJ. The impact of recent technological advances on the trueness and precision of DXA to assess body composition. Obesity. 2012; 20(1): 30-39.
Scheid JL, Toombs RJ, Gibbs JC, Ducher G, Williams NI, and De Souza MJ. Estrogen and peptide YY are associated with bone mineral density in premenopausal exercising women. Bone. 2011; 49(2): 194-201.
Gibbs JC, Williams NI, Scheid JL, Toombs RJ, and De Souza MJ. The association of a high drive for thinness with energy deficiency and severe menstrual disturbances: Confirmation in a large population of exercising women. International Journal of Sport Nutrition and Exercise Metabolism. 2011; 21(4): 280-290.
Corr M, De Souza MJ, Toombs RJ, Williams NI. Circulating leptin concentrations do not distinguish menstrual status in exercising women. Human Reproduction. 2011; 26(3): 685-694.
De Souza MJ, Toombs RJ, Scheid JL, O’Donnell E, West SL, and Williams NI. High prevalence of subtle and severe menstrual disturbances in exercising women: confirmation using daily hormone measures. Human Reproduction. 2010 Feb; 25(2):491-503.
De Souza MJ, Mallinson RJ, Strock NCA, Koltun KJ, Olmsted MP, Ricker EA, Scheid JL, Allaway HC, Mallinson DJ, Kuruppumullage Don P, and Williams NI. Randomized controlled trial of the effects of increased energy intake on menstrual recovery in exercising women with menstrual disturbances: The "REFUEL" Study. Human Reproduction 2021.
Strock NCA, Koltun KJ, Mallinson RJ, Williams NI, and De Souza MJ. Characterizing the resting metabolic rate ratio in ovulatory exercising women over 12 months. Scandinavian Journal of Medicine and Science in Sport 2020; 30(8): 1337-1347.
Mallinson RJ, Southmayd EA, and De Souza MJ. Geometric and “true” densitometric characteristics of bones in athletes with stress fracture and menstrual disturbances: A systematic review. Sports Medicine2019; 49(7):1059-1078.
Southmayd EA, Williams NI, Mallinson RJ,and De Souza MJ. Energy deficiency suppresses bone turnover in exercising women with menstrual disturbances. Journal of Clinical Endocrinology and Metabolism2019.
Williams NI, Mallinson RJ, and De Souza MJ. Rationale and study design of an intervention of increased energy intake in women with exercise-associated menstrual disturbances to improve menstrual function and bone health: The REFUEL Study. Contemporary Clinical Trials Communications2019; 14: 100325.
Southmayd EA, Mallinson RJ, Williams NI, Mallinson, DJ, and De Souza MJ. Unique effects of energy versus estrogen deficiency on multiple components of bone strength in exercising women. Osteoporosis International 2017; 28(4): 1365-1376.
Koehler K, Williams NI, Mallinson RJ, Southmayd EA, and De Souza MJ. Low resting metabolic rate in exercise-associated amenorrhea is not due to a reduced proportion of highly active metabolic tissue compartments. American Journal of Physiology - Endocrinology and Metabolism 2016; 311(2): E480-487.
Mallinson RJ, Williams NI, Gibbs JC, Allaway HC, Koehler K, Southmayd EA, and De Souza MJ. Current and past menstrual status is an important determinant of femoral neck geometry in exercising women. Bone 2016 (In Press; Accepted January 2016).
Reed JL, De Souza MJ, Mallinson RJ, Scheid JL, and Williams NI. Energy availability discriminates clinical menstrual status in exercising women. Journal of the International Society of Sports Nutrition 2015; 12: 11.
Allaway HC, Williams NI, Mallinson RJ, Koehler K, and De Souza MJ. Reductions in urinary collection frequency for assessment of reproductive hormones provide physiologically representative exposure and mean concentrations when compared with daily collection. American Journal of Human Biology 2014 [Epub ahead of print].
Mallinson RJ and De Souza MJ. Current perspectives on the etiology and manifestation of the "silent" component of the Female Athlete Triad. International Journal of Women's Health 2014; 6: 451-467.
Joy E, De Souza MJ, Nattiv A, Misra M, Williams NI, Mallinson RJ, Gibbs JC, Olmsted M, Goolsby M, Matheson G, Barrack M, Burke L, Drinkwater B, Lebrun C, Loucks AB, Mountjoy M, Nichols J, Borgen JS. 2014 Female Athlete Triad Coalition Consensus Statement on Treatment and Return to Play of the Female Athlete Triad. Current Sports Medicine Reports 2014; 13(4): 219-232.
De Souza MJ, Nattiv A, Joy E, Misra M, Williams NI, Mallinson RJ, Gibbs JC, Olmsted M, Goolsby M, Matheson G. 2014 Female Athlete Triad Coalition Consensus Statement on Treatment and Return to Play of the Female Athlete Triad: 1st International Conference held in San Francisco, CA May 2012 and 2nd International Conference held in Indianapolis, IN, May 2013. British Journal of Sports Medicine 2014; 48(4): 289. AND Clinical Journal of Sports Medicine 2014; 24(2): 96-119.
Mallinson RJ, Williams NI, Olmsted MP, Scheid JL, Riddle ES, and De Souza MJ. A case report of recovery of menstrual function following a nutritional intervention in two exercising women with amenorrhea of varying duration. Journal of the International Society of Sports Nutrition 2013; 10(1): 34.
Mallinson RJ, Williams NI, Hill BR, and De Souza MJ. Body composition and reproductive function exert unique influences on indices of bone health in exercising women. Bone 2013; 56(1): 91-100.
Gibbs JC, Williams NI, Mallinson RJ, Reed JL, Rickard AD, and De Souza MJ. Effect of high dietary restraint on energy availability and menstrual status. Medicine and Science in Sports and Exercise 2013; 45(9): 1790-1797.
Toombs RJ, Ducher G, Shepherd J, and De Souza MJ. The impact of recent technological advances on the trueness and precision of DXA to assess body composition. Obesity. 2012; 20(1): 30-39.
Scheid JL, Toombs RJ, Gibbs JC, Ducher G, Williams NI, and De Souza MJ. Estrogen and peptide YY are associated with bone mineral density in premenopausal exercising women. Bone. 2011; 49(2): 194-201.
Gibbs JC, Williams NI, Scheid JL, Toombs RJ, and De Souza MJ. The association of a high drive for thinness with energy deficiency and severe menstrual disturbances: Confirmation in a large population of exercising women. International Journal of Sport Nutrition and Exercise Metabolism. 2011; 21(4): 280-290.
Corr M, De Souza MJ, Toombs RJ, Williams NI. Circulating leptin concentrations do not distinguish menstrual status in exercising women. Human Reproduction. 2011; 26(3): 685-694.
De Souza MJ, Toombs RJ, Scheid JL, O’Donnell E, West SL, and Williams NI. High prevalence of subtle and severe menstrual disturbances in exercising women: confirmation using daily hormone measures. Human Reproduction. 2010 Feb; 25(2):491-503.
Letters to the Editor
De Souza MJ, Williams NI, Nattiv A, Joy E, Misra M, Loucks AB, Matheson G, Olmsted MP, Barrack M, Mallinson RJ, Gibbs JC, Goolsby M, Nichols JF, Drinkwater B, Sanborn CB, Agostini R, Otis CL, Johnson MD, Hoch AZ, Alleyne JM, Wadsworth LT, Koehler K, VanHeest J, Harvey P, Weiss Kelly AK, Fredericson M, Brooks GA, O'Donnell E, Callahan LR, Putukian M, Costello L, Hecht S, Rauh MJ, McComb J. Misunderstanding the Female Athlete Triad: Refuting the IOC Consensus Statement on Relative Energy Deficiency in Sport (RED-S). British Journal of Sports Medicine 2014; 48(20): 1461-1465.
Book Chapters
Mallinson RJ, Gibbs JC, and De Souza MJ. Impact of physical activity and exercise on female reproductive potential. In: Diana Vaamonde, Stefan S. Du Plessis, and Ashok Agarwal (Eds.) Exercise and Human Reproduction - Induced Fertility Disorders and Possible Therapies. Springer Science + Business Media. (Submitted Jan 15, 2013; Expected publication: 2016)
Gibbs JC, Mallinson RJ, and De Souza MJ. Hormonal and reproductive changes associated with physical activity and exercise. In: Diana Vaamonde, Stefan S. Du Plessis, and Ashok Agarwal (Eds.) Exercise and Human Reproduction - Induced Fertility Disorders and Possible Therapies. Springer Science + Business Media. (Submitted Jan 15, 2013; Expected publication: 2016).
Allaway HC, Mallinson RJ, and De Souza MJ. Impact of combined oral contraceptive use on exercise and health in female athletes. In: Diana Vaamonde, Stefan S. Du Plessis, and Ashok Agarwal (Eds.) Exercise and Human Reproduction - Induced Fertility Disorders and Possible Therapies. Springer Science + Business Media. (Submitted Dec 2014; Expected publication: 2016).
De Souza MJ and Toombs RJ. Amenorrhea associated with the female athlete triad: etiology, diagnosis and treatment. In: Santoro NF and Neal-Perry G (Eds.). Amenorrhea: A Case-Based, Clinical Guide. Springer Science + Business Media, 2010.
De Souza MJ and Toombs RJ. Amenorrhea associated with the female athlete triad. In: Mooren F (Ed.). Encyclopedia of Exercise Medicine in Health and Disease. Springer, 2012.
Gibbs JC, Mallinson RJ, and De Souza MJ. Hormonal and reproductive changes associated with physical activity and exercise. In: Diana Vaamonde, Stefan S. Du Plessis, and Ashok Agarwal (Eds.) Exercise and Human Reproduction - Induced Fertility Disorders and Possible Therapies. Springer Science + Business Media. (Submitted Jan 15, 2013; Expected publication: 2016).
Allaway HC, Mallinson RJ, and De Souza MJ. Impact of combined oral contraceptive use on exercise and health in female athletes. In: Diana Vaamonde, Stefan S. Du Plessis, and Ashok Agarwal (Eds.) Exercise and Human Reproduction - Induced Fertility Disorders and Possible Therapies. Springer Science + Business Media. (Submitted Dec 2014; Expected publication: 2016).
De Souza MJ and Toombs RJ. Amenorrhea associated with the female athlete triad: etiology, diagnosis and treatment. In: Santoro NF and Neal-Perry G (Eds.). Amenorrhea: A Case-Based, Clinical Guide. Springer Science + Business Media, 2010.
De Souza MJ and Toombs RJ. Amenorrhea associated with the female athlete triad. In: Mooren F (Ed.). Encyclopedia of Exercise Medicine in Health and Disease. Springer, 2012.