Margaret T. Jones

Margaret T. Jones
George Mason University | GMU · Sport, Recreation, and Tourism Management

PhD, FACSM, FNSCA, CSCS*D

About

269
Publications
86,911
Reads
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2,192
Citations
Introduction
My translational research in sport science focuses on improving sport performance and athlete health, specifically through athlete load monitoring, resistance training, assessment of athletic fitness and athlete dietary habits and nutrition practices.
Additional affiliations
August 2010 - present
George Mason University
Position
  • Professor (Full)
August 1995 - June 2010
Springfield College
Position
  • Assistant, Associate, and Full Professor
August 1993 - May 1995
Ithaca College
Position
  • Professor (Assistant)

Publications

Publications (269)
Article
Examination of the relationship between performance testing and psychological measures before and after a 12-week strength and conditioning program was the study's purpose. Female NCAA Division-III soccer (n = 28), field hockey (n = 28), and softball (n = 19) athletes completed pre- and post-testing held 12 weeks apart. On day 1, athletes completed...
Article
Full-text available
Purpose: To examine rest-redistribution (RR) effects on back-squat kinetics and kinematics in resistance-trained women. Methods: Twelve women from strength and college sports (5.0 ± 2.2 y training history) participated in the randomized crossover-design study with 72 h between sessions (3 total). Participants completed 4 sets of 10 repetitions u...
Article
Full-text available
Vitamin D may play a role in performance and injury risk, yet the required supplementation dosage for collegiate athletes is unclear. The objective of this study was to define the dosage of vitamin D3 supplementation required to beneficially affect serum 25-hydroxyvitamin D (25(OH)D) among a sample of collegiate basketball athletes. This was a quas...
Article
Monitoring athlete training load is important to training programming and can help balance training and recovery periods. Further, psychological factors can affect athlete’s performance. Therefore, the purpose was to examine the relationship between external load and self-reported wellness measures during soccer pre-season. Collegiate men soccer at...
Article
This investigation examined the effect of rest- redistribution (RR) on the circulating cytokine response to resistance exercise in resistance- trained women. Participants (n = 13; 24 ± 4y; 65.0 ± 10.6 kg; 160.5 ± 5.1 cm) completed two sessions of back squats at 70% of 1- repetition maximum: Traditional sets (TS: 4x10, 120-s inter- set rest) and RR...
Article
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INTRODUCTION: Monitoring athlete workloads in-season provides data relative to physical demands. Athletes are faced with multiple games per week, frequent travel, and academic stressors. Thus, tracking load serves an important role in balancing stress and recovery as variations in workload are vital to optimizing performance and well-being. To assi...
Poster
Full-text available
Seasonal changes by position in fat-free mass index in collegiate American football players Jennifer B. Fields, 1,2 Maddy Dunne, 1 Adam Feit, 1 Kyle Beyer, 3 Meghan K. Magee, 2,4 Margaret T.Jones, 2,5 Andrew R. Jagim 2,6 1 Exercise Science and Athletic Training, Springfield College, Springfield, MA 2 Patriot Performance Laboratory, Frank Pettrone...
Article
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Relative Energy Deficiency in sport is experiencing remarkable popularity of late, particularly among female athletes. This condition is underpinned by low energy availability, which is a byproduct of high energy expenditure, inadequate energy intake, or a combination of the two. Several contributing factors exist that may predispose an athlete to...
Article
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Accentuated eccentric loading (AEL) employs heavier load magnitudes in eccentric actions than concentric actions of complete stretch-shortening cycles. In doing so, unique neuromuscular and molecular responses are expected to result in acute post-activation performance enhancements, as evidenced by increased movement velocity or power. Improvements...
Article
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Abstract: In the field of sports science, the recovery umbrella is a trending topic, and even more so in the world of elite sports. This is evidenced by the significant increase in scientific publications during the last 10 years as teams look to find a competitive edge. Recovery is recognized to be an integral component to assist athlete preparati...
Article
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Monitoring external loads may minimize injury risk and improve physical performance. The purpose was to describe the external loads of a men’s collegiate soccer team during practice and games at the start of in-season play. In the first 2 weeks of the competitive season, National Collegiate Athletic Association Division I soccer athletes (n=19; mea...
Article
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The purpose of this study is to determine the effects of coupling WBV and acute muscular fatigue to determine its effects on countermovement vertical jump (CMVJ) performance and isometric mid-thigh pull (IMTP). Twenty-eight healthy active adults volunteered for five-day study. Testing sessions 2–5 included one of four conditions: No WBV and no fati...
Conference Paper
Full-text available
INTRODUCTION: Quantifying external workload provides insight into physical stress imposed upon athletes during training and games. By design, pre-season training should prepare athletes for the rigors of the competitive season, yet athletes often experience higher workloads in games than practice (1). Further, lower pre-season workloads are associa...
Article
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International Journal of Exercise Science 14(6): X-Y, 2021. Limited research exists on physical performance assessments for women collegiate athletes. The current cross-sectional study compared field-based tests of muscular strength and power and investigated their relationship. Sports included field hockey, volleyball, soccer, and softball. Tests...
Article
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ASSESSMENT OF TWO WEARABLE SENSOR SYSTEMS DURING SPEED AND AGILITY TESTS Faith S. A. Brown1,2, Brian Guthrie1,3, Jennifer B. Fields1,4, Robert E. Baker1,3, Margaret T. Jones1,2,3 1Patriot Performance, Laboratory, Frank Pettrone Center for Sports Performance, George Mason University, Fairfax, VA 2Sport, Recreation, and Tourism Management, George M...
Poster
Full-text available
Presented at the 2021 NSCA National Conference virtual poster gallery
Article
Fields, JB, Merigan, JM, Gallo, S, White, JB, and Jones, MT. External and internal load measures during preseason training in men collegiate soccer athletes. J Strength Cond Res 35(9): 2572-2578, 2021-Collegiate athletes are exposed to high volume loads during preseason training. Monitoring training load can inform training and recovery periods. Th...
Article
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Sport nutrition knowledge has been shown to influence dietary habits of athletes. The purpose of the current study was to examine relationships between sport nutrition knowledge and body composition and examine potential predictors of body weight goals in collegiate athletes. Participants included National Collegiate Athletic Association Division I...
Article
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Laboratory assessments of maximal oxygen uptake (VO2max) are considered the “gold standard” for ascertaining cardiovascular fitness, but they are not always practical for use in team sport settings. Therefore, the purpose of the current study was to compare the criterion assessment of VO2max on a treadmill to the progressive, multistage 20-m shuttl...
Preprint
Full-text available
Sport nutrition knowledge has been shown to influence dietary habits of athletes. The purpose of the current study was to examine relationships between sport nutrition knowledge and body composition and examine potential predictors of body weight goal in collegiate athletes. Participants included National Collegiate Athletic Association Division II...
Article
Full-text available
The purpose was to examine effects of sex, drop height, and external loads on drop jump mechanics in Reserve Officer Training Corps cadets and whether findings were associated with strength. Males (n=14) and females (n=12) completed maximal isokinetic concentric (slow-C, fast-C) and eccentric (slow-E, fast-E) knee extensions and flexions at 60°·s−1...
Article
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Low-income Latino children are at high risk for obesity and associated comorbidities. Considering the health benefits of proper sleep habits and physical activity, understanding the patterns , or the relationship between these modifiable factors may help guide intervention strategies to improve overall health in this population. Thus, the purpose w...
Article
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The purpose was to evaluate the acute effects of accentuated eccentric loading (AEL) on bench press velocity and subsequent perceived effort (RPE) and soreness. Resistance-trained men (n=8) and women (n=2) completed 4 sets of 5 bench press repetitions with AEL and traditional loading (TL) using concentric loads of 50% (AEL50, TL50) and 65% (AEL65,...
Article
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Background: The purpose of this study was to examine the relationship between training load and next-day recovery in collegiate American football (AF) players during pre-season. Methods: Seventeen athletes (Linemen, n = 6; Non-linemen, n = 11) participated in the 14-day study wearing monitoring (accelerometer + heart rate) sensors during on-field p...
Article
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(1) Background: Limited information exists on the prevalence of low energy availability (LEA) in collegiate team sports. The purpose of this study was to examine the prevalence of LEA in collegiate women soccer players. (2) Methods: Collegiate women soccer athletes (n = 18, height: 1.67 ± 0.05 m; body mass: 65.3 ± 7.9 kg; body fat %: 24.9 ± 5.6%) h...
Article
The purpose was to investigate the effect of rest-redistribution (RR) on muscle damage after eccentric knee extensions. After 2 weeks of eccentric familiarization, 11 resistance-trained men performed 2 work-matched isokinetic unilateral eccentric knee extension protocols at 60°·s using a crossover design, separated by 7 days. Subjects performed 40...
Article
Full-text available
Redistributing long inter-set rest intervals into shorter but more frequent rest intervals generally maintains concentric performance, possibly due to improved energy store maintenance. However, eccentric actions require less energy than concentric actions, meaning that shorter but more frequent sets may not affect eccentric actions to the same deg...
Presentation
Full-text available
The primary purpose was to evaluate the acute effects of accentuated eccentric loading (AEL) on bench press repetition velocity and power and subsequent perceived effort and soreness. A secondary purpose was to investigate whether an individual’s relative strength influenced such effects of AEL. Resistance-trained men (n=8) and women (n=2) complete...
Poster
Full-text available
Self-reported measures of athlete well-being have been shown to relate to player external load. Self-reported measures may provide information on an athlete’s capacity to train that day. The study had two purposes: 1) to investigate the relationship between gameday self-reported measures and player external load, and 2) to determine if player’s gam...
Poster
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The purpose of this study was to investigate the relationship between sleep quantity and quality and perceived exertion during pre-season training and in-season practices and games for collegiate women's basketball athletes.
Poster
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The purpose was to determine markers of internal and external athlete load during the 9-week period of conference play for all practices and games.
Article
Background Research has found multidisciplinary weight management programs targeted to at-risk Latino children are successful at slowing weight gain and improving fruit/vegetable consumption. Research on the effects of other large-scale nutrition changes and dietary behaviors in this group are limited. Objective To determine whether participation...
Article
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Background Latinos have some of the highest rates of pediatric obesity compared to other ethnic minorities. Treatment efforts should include a multidisciplinary and culturally adapted approach. Program attendance has been shown to influence health outcomes, yet has not been explored with pediatric programs targeting low-income and ethnic minority p...
Article
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The purpose was to determine differences in time under tension, cortisol, inflammation, and perceived soreness between accentuated eccentric (AEL) and traditional loading (TRA) resistance exercise protocols. Resistance-trained men (n=21) completed the AEL and TRA protocols in random order, separated by 48 hours (sets*reps@eccentric/concentric): AEL...
Article
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Research describing the match and specific positional demands during match play in women’s collegiate soccer is limited. The purpose of the study was to quantify the match demands of National Collegiate Athletic Association (NCAA) Division III soccer and assess position differences in movement kinematics, heart rate (HR), and energy expenditure. Tw...
Article
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Objectives To compare cardiometabolic biomarkers between age and sex-matched pairs of overweight/obese and healthy weight elementary-school aged Latino children. Methods This was a case-control study in which cases, who were participating in a culturally-adapted pediatric weight management program targeting overweight/obese (BMI-for-age ≥85th perc...
Article
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Objectives To assess the demographic predictors of attrition and attendance among Latino children and their families participating in a family-based, culturally-adapted pediatric weight management program. Methods Latino children, ages 5–9 with a BMI-for-age ≥85th percentile were recruited from local schools and clinics serving low-income populati...
Article
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The purpose was to investigate whether whole-body vibrations (WBV) effect on force-time 1 characteristics is dependent upon time and sex. Subjects (men, n=18; women, n=18) 2 performed a static quarter squat with WBV (frequency: 30Hz; amplitude: 2-4 mm) and 3 without for 5 x 30 second repetitions (1:1 WBV:rest). Next, they performed 2 sets of 3 4 re...
Presentation
Full-text available
Regardless of sex and physical stature, tactical athletes are required to execute physical tasks during training and operational scenarios while wearing equipment of similar weight. The effect of external loads upon performance during jumping tasks and vertical ground reaction forces when landing is unclear. Further, it is important to determine th...
Poster
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The incidence of lower extremity injury in Reserve Officer Training Corps (ROTC) cadets is 10% greater for women and the majority occur at the thigh or knee. Since, likelihood of injury may be dependent upon absolute muscle strength and asymmetries among muscle groups, evaluation of quadricep and hamstring function is imperative. In consideration o...
Presentation
Full-text available
For tactical athletes, physical performances and injury rates are influential to mission success and personnel safety. Non-combat musculoskeletal injuries make up the majority of warfighter injuries and may stem from the interaction between load carriage requirements and neuromuscular performance capabilities. Although strength may relate to jump p...
Poster
Full-text available
In tactical athletes, sex differences have been reported for incidence of stress fractures and physical fitness performances, possibly as a result of differing bone mineral density (BMD, bone content per area) and lean body mass (LBM). Associations with health, appearance, and performance make a relatively low body fat (BF%) desirable within this p...
Article
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Women athletes are at higher risk for bone diseases; yet, information on vitamin D status ((25(OH)D), vitamin D binding protein (VDBP), and bioavailable 25(OH)D is limited. Collegiate athletes (n = 36) from volleyball (WVB), basketball (WBB), and track and field (WTF) were measured for (25(OH)D), VDBP, and bioavailable 25(OH)D; body composition and...
Article
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International Journal of Exercise Science V(i): X-Y, YEAR. Monitoring internal load provides useful and non-invasive markers of training stress and adaptation. However, the relationship between internal load measures across a competitive window remains inconclusive and limited. The purpose of this study was to report various internal load measures,...
Article
Full-text available
Purpose: To identify acute effects of a single accentuated eccentric loading (AEL) repetition on subsequent back-squat kinetics and kinematics with different concentric loads. Methods: Resistance-trained men (N = 21) participated in a counterbalanced crossover design and completed 4 protocols (sets × repetitions at eccentric/concentric) as follo...
Article
Full-text available
The purpose was to examine acute effects of rest redistribution on perceptual, metabolic, and hormonal responses during back squats. Twelve resistance-trained women (training age 5±2 years; one-repetition maximum (1-RM) per body mass, 1.6±0.2) performed traditional (TS, 4 sets of 10 repetitions with 120 seconds inter-set rest) and rest-redistributi...
Conference Paper
Full-text available
Collegiate basketball athletes are exposed to high external loads as they withstand elevated volumes of sprinting, jumping, and change of direction movements in practice and gameplay over a sixmonth period. Selfreported measures (SRM) of athlete wellbeing have been shown to be related to external load and thus, may provide information on an athlete...
Article
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Given the high prevalence of obesity in Latino children and potential health risks, the purpose of this study was to: 1) evaluate relationships among metabolic-risk, fitness, and body fatness; 2) determine sex differences in cardio-metabolic risk factors and fitness of obese children of Latino descent. Sixty children (boys, n = 39, 7.8 ± 1.5 years;...
Article
Full-text available
Given the high prevalence of obesity in Latino children and potential health risks, the purpose of this study was to: 1) evaluate relationships among metabolic-risk, fitness, and body fatness; 2) determine sex differences in cardio-metabolic risk factors and fitness of obese children of Latino descent. Sixty children (boys, n = 39, 7.8 ± 1.5 years;...
Article
Full-text available
Vitamin D plays a key role in bone health, musculoskeletal function, and sport performance. Collegiate athletes competing in indoor sports may be at greater risk of vitamin D deficiency due to limited outdoor time. Therefore, the purpose was to assess 25-hydroxyvitamin D (25(OH)D) concentrations among collegiate men and women basketball (MBB, WBB)...
Article
Objective: To determine the feasibility of a pediatric weight management program for low-income Latino families. Methods: A pretest-posttest pilot study was conducted among 60 Latino children, aged 4-9, who were overweight/obese (body mass index-for-age ≥85th percentile). The 10-week group-based community program addressed diet, exercise, and be...
Article
Full-text available
The purpose was to investigate the effects of using compound sets during a 12-week lower body resistance training program on muscle strength, endurance, hypertrophy, architecture, and soreness. Thirty-one recreationally active females were randomly assigned into one of three groups: traditional sets, compound sets, or control. The training groups p...
Poster
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Accentuated eccentric loading (AEL) may elicit muscle damage, and result in increased levels of perceived soreness and fatigue. Momentary muscular fatigue and high levels of time under tension (TUT) are commonly reported in the literature. However, the effect of supramaximal AEL, during the initial repetition (rep) of a set, upon TUT and self-asses...
Poster
Full-text available
Accentuated eccentric loading (AEL) may potentiate muscle activity and lead to enhanced concentric velocity, but results vary with lifting tempo and eccentric load. Weight releasers can be used to implement AEL, but due to their nature of use, evaluation of velocity generally is limited to one repetition (rep). However, the velocity of non-AEL reps...
Poster
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Sex, low income, insufficient physical activity levels, and excess body fat have been associated with low physical fitness levels in children. Further, children of Latino descent are more likely to be obese than their white counterparts. Yet, little is known about fitness abilities of obese, Latino children. PURPOSE: To evaluate the relationship be...
Poster
Full-text available
Family-based pediatric obesity treatment programs, which include organized physical activity, have become increasingly popular and have been effective in reducing adiposity and increasing fitness among children. Yet, treatment programs remain limited for Latino children, a population disproportionally affected by obesity. PURPOSE: To evaluate the e...
Poster
Sex differences in muscular strength and power are often diminished when accounting for fat free mass or muscle volume. However, the evaluation of sex differences in rate of force development (RFD) and the role of fat free mass on potential differences have not been fully investigated. PURPOSE: To examine sex differences in kinetics (forces) during...
Conference Paper
Full-text available
National Collegiate Athletic Association Division I (NCAA-DI) women's basketball (WBB) athletes are exposed to high intensity and high volume workloads throughout the competitive season, which consists of 4-5 practices and 1-2 games each week. Monitoring both internal and external practice and game workloads may maintain performance as well as mini...
Article
Full-text available
Objectives: The aim of the study is to examine the relationship between 25-hydroxyvitamin D (25(OH)D) concentrations, insulin resistance and lipid profiles among Latino children who are overweight/obese. Methods: Data from 59 children (65% male, 90% obese, mean ± SD age: 7.6 ± 1.5, range: 4-10 years) participating in a pediatric weight managemen...
Article
Full-text available
Objectives: To determine the relative validity of a food screener compared with two 24-hour joint parent-child dietary recalls for measuring dietary intakes in low-income Latino children who are overweight/obese. Methods: Dietary intake of children participating in a pediatric obesity weight management program was measured at baseline using both...