Janet Walberg Rankin's research while affiliated with Virginia Polytechnic Institute and State University and other places

Publications (40)

Article
Full-text available
The purpose of this study was to evaluate the impact of fall season vitamin D 3 supplementation on strength/power, body composition, and anabolic hormones in swimmers with optimal vitamin D status at summer’s end. Male and female National Collegiate Athletic Association Division I swimmers ( N = 19) with optimal 25-hydroxyvitamin D [25(OH)D] random...
Article
The effect of docosahexaenoic acid (DHA) on inflammatory and muscle damage response to acute eccentric exercise and to the subsequent initiation of a resistance- training program was studied in 41 untrained men. Subjects consumed either 2 g/d of either DHA or placebo (PL) for 28 d prior to a 17 d exercise phase (d 1 to d 17) that began with an ecce...
Article
Because higher body fat and lower lean mass is associated with excess morbidity and mortality, health care teams need specific science-based recommendations to advise clients on lifestyle approaches to alter body composition. Combining exercise with modest energy restriction is recommended to cause up to 20% more weight and fat loss, improved funct...
Article
Performance in many team sports is partially dependent on the ability to perform repeatedly at high intensity. Previous research demonstrates that capsaicin (CAP) has physiological and metabolic effects that could influence exercise performance and inflammation. The purpose of this study was to investigate the influence of CAP on performance of and...
Article
Full-text available
Studies show that obese individuals have prolonged elevations in postprandial lipemia and an exacerbated inflammatory response to high fat meals, which can increase risk for cardiovascular diseases. As epidemiological studies indicate an association between type of fat and circulating inflammatory markers, the purpose of this study was to investiga...
Article
The objective of this study was to test the hypothesis that the inflammatory response to a high-fat, low-carbohydrate weight loss diet (HF) we previously observed was due to oxidative stress. Nineteen overweight subjects (BMI>27 kg/m(2)) were randomly assigned to either an antioxidant supplement (AS) (1 g vitamin C/800 IU vitamin E) or a placebo (P...
Article
Oxidative stress can initiate increased inflammation that elevates risk for cardiovascular disease. The objective of this study was to determine the effects of daily consumption of raisins on markers of oxidative stress, inflammation and endothelial activation in response to an acute high-fat meal in overweight individuals. Seventeen overweight men...
Article
Chronic inflammation is associated with elevated risk of heart disease and may be linked to oxidative stress in obesity. Our objective was to evaluate the effect of weight loss diet composition (low carbohydrate, high fat, LC or high carbohydrate, low fat, HC) on inflammation and to determine whether this was related to oxidative stress. Twenty nin...
Article
The primary purpose of this study was to examine the effect of energy restriction on antioxidant capacity in trained athletes. Secondly, our study determined whether dietary protein source influenced the antioxidant response, performance, and immunity. Twenty male cyclists consumed either whey or casein supplement (40 g/day) in addition to their di...
Article
Full-text available
Athletes are interested in nutritional manipulations that may enhance lean tissue gains stimulated by resistance training. Some research demonstrates that acute consumption of food containing protein causes superior muscle protein synthesis compared to isoenergetic foods without protein. This benefit has not been verified in longer-term training st...
Article
The SenseWear Armband (SWA; BodyMedia, Inc.), using multiple sensors, was designed to estimate energy expenditure (EE) in free-living individuals. To examine the reliability and validity of the SWA during rest and exercise compared with indirect calorimetry (IC). EE was assessed with SWA and IC in 13 males during two resting and one cycle ergometry...
Article
This study investigated the effect of initial muscle glycogen on performance of repeated sprints and some potential mechanisms for an effect of glycogen on fatigue. Eight subjects performed 2 cycling trials (repeated 60-s sprints) following consumption of either a high carbohydrate (HC) or a low carbohydrate (LC) diet. Muscle biopsies and blood sam...
Article
Guidance from health professionals will assist the significant proportion of athletes who desire a change in their body weight. Athletes who use drastic food or fluid restriction to lose weight may experience negative consequences, including loss of lean tissue, hormonal disturbances, and performance impairment. Excess food consumption for weight g...
Article
Anaerobic performance and body protein may decrease with energy restriction practiced by some athletes for weight loss. This investigation examined the effects of creatine (Cr) supplementation during energy restriction on muscle Cr, exercise performance (10 sprints of 6 s, with 30-s rest), nitrogen balance, and body composition in male resistance t...
Article
Sixteen collegiate women lacrosse players consumed either creatine (C, n = 7) or a placebo (P, n = 9) for 5 weeks during their preseason conditioning program (20 g [middle dot] d-1 for 1 week and 2 g [middle dot] d-1 for 4 weeks). Pre-and posttesting consisted of body composition, muscle endurance test, blood lactate response to the endurance test,...
Article
The effect of acute carbohydrate consumption on performance and metabolism of resistance-trained males was determined. Twenty-two subjects, assigned to either carbohydrate (C, n = 8), placebo (P, n = 8), or control (N, n = 6), performed standardized workouts every other day for a week prior to testing and throughout the testing period. Three of the...
Article
Most research confirms that the body's increased use of protein, as a "fuel" and for repair, increases with aerobic exercise, especially during high intensity and long duration activity. Protein intake higher than the United States Food and Drug Administration's Recommended Dietary Allowance (RDA), with additional energy and resistance training, re...
Article
The purpose of this study was to develop a system for characterizing food purchases by families using supermarket receipt data. One hundred and five shoppers contributed data that represented 363 people (138 children and 225 adults). Participants provided food purchase receipt data for at least 6 weeks, which included an average of at least 20 food...
Article
Collegiate wrestlers (N = 12) consumed a formula, hypoenergy diet (18 kcal.kg-1, 60% carbohydrate) without dehydration for 72 h. For the next 5 h, the athletes were fed either a 75% (HC) or a 47% (MC) carbohydrate formula diet of 21 kcal.kg-1. Each wrestler performed three anaerobic arm ergometer performance tests (TEST1, before weight loss; TEST2,...

Citations

... the meta-analysed studies of total testosterone and free testosterone. We were not able to extract effect sizes related to the effect of vitamin D from two studies of total testosterone and were not able to extract data on free testosterone from one of these studies, as data were presented in a figure only [36,37]. One of these RCTs [36] found evidence of a decrease in total testosterone and free testosterone following 12 weeks of vitamin D supplementation. ...
... Physical inactivity and obesity with unfavorable outcomes for health (Blair and Church, 2004) support the recommendation for changes on the lifestyle that influence the body composition and health, such as eating habits improvement and inclusion of physical activity (Hauser et al., 2004;Rankin, 2015). ...
... In athletes, polyunsaturated fatty acids have beneficial effects on the immune system through alleviation of postexercise immunosuppression and through anti-inflammatory action. This has been suggested to improve muscle recovery and tolerance to strenuous exercise programs, as evident from studies with omega-3 fatty acid supplementation after eccentric resistance training, 86,87 in turn mediating better training adaptations. Future research should therefore address the proportion of dietary fat intake of female elite football players. ...
... Disadvantaged groups were more likely to buy fewer types of fruit and vegetables and less regularly than their higher status counterparts (14). In Virginia, lower family socioeconomic status (SES), computed using family income, was associated with higher levels of fat in food purchases and at the highest risk for poor nutrition quality (27). The most deprived Scottish households consume lower fruit and vegetables, brown/wholemeal bread, breakfast cereals, and oil-rich, and white fish, and higher total bread highest compared with the least deprived households for the period 2007-2009 (28). ...
... In fact, recovery of fluids lost through dehydration may take 24-48 hours (75) and the most effective way to restore fluid balance includes an intake of fluid equivalent to 125-150% of the fluid deficit, together with replacement of lost electrolytes, principally sodium; reduction of glycogen storage secondary to weight loss can be overcome with time and adequate CHO intake, however recovery may not be realistically achieved between weight-in and the start of competition. A high CHO-diet during recovery from energy restriction can prevent the impairment of performance due to loss in muscle and liver glycogen (82). ...
... The SWA proprietary software (Sensewear Professional 8.0; BodyMedia) was used to calculate energy expenditure based on a proprietary algorithm that incorporates the subject information entered before data collection (height, weight, age, and gender) and measurements collected by the armband. SWA has been demonstrated to be a valid device for estimating EE in free-living individuals and during physical activity (up to 10 metabolic equivalents) [24,25]. Brazeau et al. [26] evaluated the reliability of the SWA, and found the device to be reliable for estimating EE in healthy adults during two consecutive days while they were performing various types of activities, including a 45-min walking session and a 45-min cycling session at moderate intensity. ...
... If skeletal muscle phosphocreatine (PCr) concentrations are increased, adenosine triphosphate (ATP) synthesis may be shifted slightly away from glycolytic metabolism, and the resultant production of lactate, to PCr catabolism. Indeed, many studies have reported lower post-exercise lactate concentrations concomitant with increased anaerobic work following 5-7 days of creatine supplementation [30,[31][32][33][34]. While betaine administration has been shown to increase skeletal muscle PCr in live stock [35], to our knowledge, only one study has been conducted on this topic in humans. ...
... Increased intracellular calcium may activate proteolytic enzymes that can disrupt the myofilaments. 20,21 At this point intracellular proteins such as creatine kinase and myoglobin will be released from the muscle cell into the blood stream. 19 The results of this study were in agreement with those found an increase in CK levels in response to exercise. ...
... Although previous research has focused on topical clinical capsaicin applications (e.g., capsaicin topical cream) (Chrubasik et al., 2010;Mason et al., 2004), more recent studies discussed its plausible oral dietetic supplementation (e.g., capsules and gummys) as ergogenic aid (Cross et al., 2020;de Moura e Silva, Cholewa, Billaut, Jäger, de Freitas, Lira, & Rossi, 2021a). While there is growing research exploring this topic (de Freitas et al., 2018;de Moura e Silva, Cholewa, Jäger, Zanchi, de Freitas, de Moura, Barros, Antunes, Caperuto, Ribeiro, Lira, et al., 2021;Opheim & Rankin, 2012), there is no systematic review specifically looking at this question on high intensity training. Therefore, the purpose of this review was to explore the effects and applications of oral capsaicinoids and capsinoids supplementation on short-term-high intensity exercises, including resistance and interval training, in young males. ...
... A CDC (Centres for Disease Control and Prevention) report indicates that about half a million Americans die every year from heart disease or about one death for every four [1]. Increasing cardiovascular and type 2 diabetes rates are linked to obesity, inflammation , and oxidative stress, which have significantly increased worldwide [2,3]. Weight loss is one of the most effective ways to reduce these conditions [4], and long term dietary strategies may be used to keep the weight off and improve health [5]. ...