Mark Loftin

Mark Loftin
University of Mississippi | UM · Department of Health, Exercise Science, & Recreation Management

Ph.D.

About

133
Publications
26,947
Reads
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2,411
Citations
Introduction
Mark Loftin is currently retired (2022). Previously he served as the Associate Dean for Academic Affairs, School of Applied Sciences, University of Mississippi. He also served as a Professor of Exercise Science in the Department of Health, Exercise Science, & Recreation Management, University of Mississippi. Mark completed research in Exercise Physiology.
Additional affiliations
January 2013 - August 2024
University of Mississippi
Position
  • RetiredProfessor and Associate Dean
August 1982 - July 1983
Springfield College
Position
  • Professor (Assistant)
June 1995 - June 2006
Louisiana State University Health Sciences Center New Orleans
Position
  • Professor (Associate) gratis
Education
August 1978 - July 1984
University of Illinois Urbana-Champaign
Field of study
  • Exercise Physiology

Publications

Publications (133)
Article
Full-text available
Among ethnicities, African Americans exhibit the highest prevalence of obesity. A more comprehensive grasp of energy expenditure while walking and running can be instrumental in managing and averting obesity. Regrettably, there is a scarcity of research dedicated to scrutinizing energy expenditure in African Americans during walking and running. Co...
Article
Background: The aim of this paper was to identify the most appropriate allometric scaling model for expressing aerobic fitness, determined by maximal oxygen consumption (VO 2max ), that would allow comparisons across differing body types. Methods: VO 2max and body composition data were collected from untrained non-obese and obese participants (N...
Article
Full-text available
This study aimed to investigate the influence of body weight, exercise modality, and pace on physiological and perceptual responses to determine the relation between perceptual and physiological responses. Aerobically untrained, normal weight, and overweight males and females participated. Participants were randomly assigned to one exercise conditi...
Article
The prevalence of obesity is increasing across the world. Knowledge of the actual energy expenditure (EE) of walking and running can lead to a more precise exercise prescription which may contribute to obesity reduction or avoidance. Limited research has focused on EE prediction during walking or running in Asian adults. So, the aims of this study...
Article
Full-text available
Knowledge of measured energy expenditure (EE) during walking and running is important for exercise prescription. Further, research on the EE comparison and EE predicted equation during walking or running among different ethnicities is limited. The purpose of the current study was to compare EE to walk or run a mile in Caucasian, African American an...
Article
Full-text available
Purpose To identify factors that influence Black women’s body size perceptions Design Interviews (cognitive mapping exercise) with 25 women; focus group with 7 additional women Setting Mississippi Delta Participants Thirty-two black women Measures Influences on body size perceptions, body mass index, and body satisfaction Analysis Interviewee...
Article
Functional limitations persist in obese patients after total knee arthroplasty (TKA). This study assessed the effect of an exercise program (EP) and fitness trackers (FT) in obese patients with TKA. Sixty patients 1 year after orthopedic surgery were recruited and received a 16-week tailored EP; half were randomized to receive an FT. FT had no meas...
Article
Full-text available
Purpose: Use of alternative footwear options such as flip-flop style sandals and minimalist athletic shoes are becoming increasingly popular footwear choices. The purpose of the investigation was to analyze the energy expenditure and oxygen consumption requirements of walking at preferred pace while wearing flip-flops, slip-on style shoes, and mini...
Article
Context: Studies developed the frail elderly handgrip strength (HGS) diagnostic criteria using multiple types of handgrip dynamometers. If different handgrip dynamometer report different values, then this would have the potential to misclassify people into the wrong diagnostic category. Objective: To examine the characteristics of HGS measured b...
Article
Full-text available
Prior work has reported that the declines observed in body mass index (BMI) and circumference measurements in their cross-sectional data were twice as large when calculated from distance energy expenditure estimations compared to energy expenditure estimations based on time and intensity. The primary purpose of this study was to compare walking/run...
Article
Objectives: To develop regression-based equations for estimating dual-energy x-ray absorptiometry (DXA) derived appendicular fat-free adipose tissue (FFAT) using a single ultrasound image in the forearm, and to investigate the validity of those equations to calculate FFAT-free appendicular lean mass (aLM-minus-FFATappendicular ) in 311 Japanese ad...
Article
Full-text available
Previous research suggests that an improvement in body composition could potentially lead to improvement in balance performance in previously overweight individuals. The purpose of this study was to evaluate if an exercise intervention without any specific balance training can lead to an improvement in standing balance. Fourteen overweight, but oth...
Article
Obese patients are more likely to have osteoarthritis and total knee arthroplasty (TKA). This investigation sought to evaluate physical function, activity level, and quality of life (QOL). Obese participants near 1-year postsurgical follow-up appointment were recruited. Evaluation included QOL and activity questionnaire, medical histories, anthropo...
Article
Full-text available
The aim of this review was to highlight research that has focused on examining expressions of peak oxygen uptake (VO2peak) in children and youth, with special reference to allometric scaling. VO2peak is considered the highest VO2 during an increasing workload treadmill or bicycle ergometer test until volitional termination. We have reviewed scholar...
Article
It is unknown whether age-related site-specific muscle loss is associated with areal bone mineral density (aBMD) in older adults. To examine the relationships between aBMD and whole-body muscle thickness distribution, 97 healthy adults (46 women and 51 men) aged 50-78 years volunteered. Total and appendicular lean soft tissue mass, aBMD of the lumb...
Conference Paper
Full-text available
Voluntary torque has previously been shown to be reduced immediately after and up to 48hours following exercise induced muscle damage (EIMD). Whole-body vibration (WBV) has been shown as a modality to increase torque production and has been investigated in reducing the decrease in torque production following EIMD. Purpose: The purpose of this inves...
Article
Full-text available
The primary aim of this study was to examine the effects of exercise intensity and duration on choice reaction time with a secondary aim to examine the influence of aerobic fitness on choice reaction time. Fifteen college-aged men enrolled in a physical fitness activity course participated. We observed a cubic trend (r = .99) across exercise intens...
Article
Before and after a follow-up period of two-years, six male master cyclists (mean age was 59 years at the start of the study, cycle training; 5-6 hrs/wk) had dual-energy X-ray absorptiometry measured body composition (i.e., areal bone mineral density [aBMD] and appendicular lean soft tissue mass [aLM]) taken. aBMD at the femoral neck and lumber spin...
Article
To test the validity of published equations, 79 Caucasian adults (40 men and 39 women) aged 50–78 y had muscle thickness (MT) measured by ultrasound at nine sites of the body. Fat-free mass (FFM), lean soft tissue mass (LM) and total muscle mass (TMM) were estimated from MT using equations previously published in the literature. Appendicular LM (aL...
Article
Unless a subject’s muscle is relatively small, a single image from a standard ultrasound can only measure muscle thickness (MT). Thus, it is important to know whether MT is related to morphological and functional characteristics of individual muscles of the extremity and trunk. In this review, we summarize previously published articles in the upper...
Article
Full-text available
Background: The aim of the study was to objectively determine whether the Nutrition and Physical Activity Self-Assessment for Child Care (NAP SACC) program improved physical activity levels during the school day. Methods: The study compared the physical activity levels of subjects from 26 daycare centers, randomized into treatment (N=13) and con...
Article
Exercise mode and intensity/duration are important factors for influencing muscle morphology and function as well as bone. However, it is unknown whether masters cyclists who undergo regular moderate- to high-intensity exercise maintain lower-body skeletal muscle mass (SM) and function and bone health when compared with young adults. The purpose of...
Article
Site-­specific thigh muscle loss may be independent of age-­related whole body muscle mass loss detected by using dual-­ energy X-­ray absorpotiometry (DXA). Site-­specific thigh muscle loss can be assessed by two major methods, i.e., magnetic resonance imaging (MRI) or computed tomography (CT) and ultrasound. Objectives: The purpose of this review...
Article
Full-text available
An equation published by Loftin, Waddell, Robinson, and Owens (201014. Loftin , M. , Waddell , D. , Robinson , J. and Owens , S. 2010. Comparison of energy expenditure to walk or run a mile in adult normal weight and overweight men and women. Journal of Strength and Conditioning Research, 24: 2794–2798. [CrossRef], [PubMed], [Web of Science ®]V...
Article
Background and aims: It is unknown if the site-specific muscle loss of ageing muscle is associated with accelerometer-determined daily step count and/or intensity of physical activity. The purpose of this study was to examine the relationships between accelerometer- determined physical activity and lower body muscle size in women. Methods: Forty-ei...
Article
Childhood cancer survivors (CCS) experience late effects that interfere with physical function. Limitations in physical function can impact CCS abilities to actively participate in daily activities. The purpose of this investigation was to evaluate the concordance between self-reported physical performance and clinically evaluated physical performa...
Article
To test the hypothesis that static balance is associated with site-specific loss of muscle mass in older adults. A total of 57 active women aged 52-83 years had their muscle thickness (MTH) measured by ultrasound at four sites on the anterior and posterior aspects of their upper- and lower-leg. MTH ratios were calculated to assess the site-specific...
Data
Full-text available
Dual-energy X-ray absorptiometry (DXA) is an attractive method for evaluating sarcopenia, age-related loss of skeletal muscle mass and function, using appendicular lean tissue (aLT) mass for criteria of diagnosis, although minimal radia-tion is exposed. Skeletal muscle (SM) mass can be estimated by using ultrasound-measured muscle thickness (MTH)....
Article
Full-text available
Dual-energy X-ray absorptiometry (DXA) is an attractive method for evaluating sarcopenia, age-related loss of skeletal muscle mass and function, using appendicular lean tissue (aLT) mass for criteria of diagnosis, although minimal radiation is exposed. Skeletal muscle (SM) mass can be estimated by using ultrasound-measured muscle thickness (MTH). H...
Article
Full-text available
Dual-energy X-ray absorptiometry (DXA) is an attractive method for evaluating sarcopenia, age-related loss of skeletal muscle mass and function, using appendicular lean tissue (aLT) mass for criteria of diagnosis, although minimal radiation is exposed. Skeletal muscle (SM) mass can be estimated by using ultrasound-measured muscle thickness (MTH). H...
Article
The purpose of this study was to compare the prevalence of severe sarcopenia detected by total skeletal muscle mass (SM) index and of site-specific thigh sarcopenia for differing age groups in men and women. Japanese nonobese men and women aged 20 to 85 (n = 1,994, 55 % women) had muscle thickness (MTH) measured by ultrasound at six sites on the an...
Article
Full-text available
The purpose of this study was to investigate the time course of hypertrophic adaptations in both the upper arm and trunk muscles following high-intensity bench press training. Seven previously untrained young men (aged 25 ± 3 years) performed free-weight bench press training 3 days (Monday, Wednesday and Friday) per week for 24 weeks. Training inte...
Article
Background and aims: It is unknown if the site-specific muscle loss of ageing muscle is associated with accelerometer-determined daily step count and/or intensity of physical activity. The purpose of this study was to examine the relationships between accelerometer- determined physical activity and lower body muscle size in women. Methods: Forty...
Article
Background: It is unknown whether severe sarcopenia produces unfavorable effects on cardiovascular risk factors. To examine the influence of severe and moderate sarcopenia on selected cardiovascular risk factors, 687 men were screened; those exhibiting clinically relevant diseases and higher body fat percentage (>25% fat) were excluded. A total of...
Article
Sarcopenia is observed as a site-specific loss of skeletal muscle mass, however, it is unknown whether the site-specific sarcopenia is associated with development of physical disability. The purpose of this study was to examine the relationship between age-related thigh muscle loss and gait performance. Fifty-three women aged 52-83 years had their...
Article
Full-text available
The incidence of breast cancer is increasing worldwide, and this seems to be related to an increase in lifestyle risk factors, including physical inactivity and overweight/obesity. We have reported previously that exercise induced a circulating angiostatic phenotype characterized by increased soluble fms-like tyrosine kinase-1 (sFlt-1) and endostat...
Article
Angiogenesis promotes obesity. However, it is not clear whether overweight/obese women have a pro‐angiogenic phenotype in the circulation. Present study determines plasma levels of unbound‐ VEGF, endostatin, sFlt‐1 in 63 lean and overweight/obese adult women volunteers aged from 18–44. Average BMI of this group was 29.1±0.82 kg/m2, in which lean BM...
Article
Full-text available
Background: Physical inactivity increases the risk of several different cancers, including breast cancer. Soluble fms-like tyrosine kinase-1 (sFlt-1) is an extra-cellular Ig-like domain of the VEGF receptor-1 that is released into the extracellular space and circulation where it inhibits the activities of VEGF. Over-expression of sFlt-1 has been sh...
Article
The purpose of this study was to examine changes in physical activity and fitness variables in members of 8 volunteer families after 3 months of home use of the Wii Fit™ interactive video game. Pre and postintervention measurements were obtained from 21 subjects relative to physical activity (5 days of accelerometry), aerobic fitness (graded treadm...
Article
Purpose: Investigate the seasonal bone density and body composition changes of elite, high school wrestlers. Subjects: 13 young boys (mean age + SD = 15.9 + 0.9 yrs) that were members of an elite high school wrestling program. Methods: In a 6-month study, bone mineral density (BMD), bone mineral content (BMC), body fat (BF), and lean tissue (LT) we...
Article
Full-text available
Objectives: To investigate the relationship between age-related, site-specific loss of thigh muscle and accelerometer determined daily physical activity. Design: Cross-sectional study. Methods: Fifty-one middle-aged and old women aged 52 to 83 years (mean age, 66.0 [SD 7.1] years) volunteered. Muscle thickness (MTH) was measured by B-mode ultrasoun...
Article
We compared the energy expenditure to walk or run a mile in adult normal weight walkers (NWW), overweight walkers (OW), and marathon runners (MR). The sample consisted of 19 NWW, 11 OW, and 20 MR adults. Energy expenditure was measured at preferred walking speed (NWW and OW) and running speed of a recently completed marathon. Body composition was a...
Article
The aim of this investigation was to compare gender differences in physiologic and perceptual responses during a 1-h run at recent marathon pace and running economy at three speeds in recreational marathon runners. In a counterbalanced design, 10 men and 10 women completed a 1-h treadmill run and a running economy test. Treadmill speed for the 1-h...
Article
This pilot study examined the feasibility of an interactive obesity prevention program delivered to a class of fourth-grade students utilizing daily e-mail messages sent to the students' home computers. The study involved a single intact class of 22 students, 17 (77%) of whom submitted parental permission documentation and received e-mail messages...
Article
The purpose of the study was to investigate the seasonal relationship of athletic amenorrhea and body composition in elite, adolescent, cross-country runners. The participants consisted of 28 female adolescent cross-country runners (mean age +/- SD = 15.4 +/- 1.5 years); 17 eumenorrheics and 11 amenorrheics. The participants' body composition was m...
Article
This study examined energy expenditure and physiologic determinants for marathon performance in recreational runners. Twenty recreational marathon runners participated (10 males aged 41 +/- 11.3 years, 10 females aged 42.7 +/- 11.7 years). Each subject completed a V(.-)O2max and a 1-hour treadmill run at recent marathon pace, and body composition w...
Article
Full-text available
OBJECTIVE: The purpose of this study was to examine the validity of two anthropometric and four bioelectric impedance (BIA) equations to estimate body composition from dual-energy x-ray absorptiometry (DXA) in adolescent girls of various ethnicities. The rationale for this study was to develop a prediction equation for percent body fat in a multi-e...
Article
To examine whether components of body composition (size, fat mass, and fat-free mass) were related to physical activity. A random sample of 60 eligible sixth grade girls at each of 36 schools (six schools per region and six regions in total sample); complete measurements on 1,553 girls. Physical activity was assessed over 6 d in each girl using an...
Article
AIM: Equations for estimating % fat mass (%BF) and fat-free mass (FFM) from bioelectrical impedance analysis (BIA) that work in adolescent girls from different racial/ethnic backgrounds are not available. We investigated whether race/ethnicity influences estimation of body composition in adolescent girls. PRINCIPAL PROCEDURES: Prediction equations...
Article
Full-text available
The purpose of this study was to compare fat-free mass (FFM) and percent body fat determined by two bio-electrical impedance analysis (BIA) instruments against criterion estimates determined by dual-energy x-ray absorptiometry (DXA) in a multi-racial/ethnic sample of adolescent girls. BIA was assessed in 151 girls (n=51 African-American; n=45 Hispa...
Article
Full-text available
The purpose of this study was to determine if differences in oxygen uptake kinetics and oxygen deficit existed between normal weight and severely overweight adolescent girls. Subjects included 10 normal weight and 8 severely overweight girls. The participants performed a leg cycling VO2 peak test and a constant load leg cycling test at 80% of the v...
Article
Full-text available
The association of age and weekly swim training distance with body water, lean tissue, fat mass and regional adiposity was examined in 27 male masters swimmers. Subjects ranged in age from 25.3 to 73.1 years (mean age = 47.7 ± 11.1 years). Weekly swim distances, estimated from self-reported swim logs, were from 3 400 to 17 500 m and averaged 10 016...
Article
Full-text available
The purpose of this study was to compare peak cardiorespiratory parameters during treadmill and cycle ergometry in severely overweight youth. Twenty-one participants from the Committed to Kids Pediatric Weight Management program at the Louisiana State University Health Sciences Center volunteered. Participants completed peak treadmill and cycle erg...