Changes in Fat Mass, Fat Free Mass, Cardiorespiratory Fitness and Grip Strength Across a College Population

Research has shown that traditional college students are more physically fit at the beginning of their freshman year compared to their senior year. PURPOSE: The purpose of this data analysis is to examine how fat mass (FM), fat free mass (FFM), handgrip strength and VO2max change in a college-aged population. METHODS: A five-year cross-sectional design was used to assess a sample of college students (n=3,379; Males=55.4%; BMI: 25.2±5.7; Age:19.4±1.5) in an introductory wellness class. The range in age was 18-25 which were divided into four groups: 1=18-19yrs, 2=20-21yrs, 3=22-23yrs and 4=24-25yrs. Subjects were taken through the following screenings: height, weight, body fat percentage, grip strength, and estimated VO2Max. Body Fat was analyzed using a Tanita. Grip strength was assessed using a handgrip dynamometer. Estimated VO2max and heart rate recovery were assessed using the Tecumseh sub-maximal step test. One-way ANOVAs were conducted to examine changes in the estimated VO2max, FFM, FM and handgrip strength. RESULTS: Comparing the whole population across age groups, there was no significant change in FM and estimated VO2max. However, hand­grip strength (F(3,3103)=11.53,P\u3c0.001) and FFM (F(3,1357)=7.58,P\u3c0.001) did change across age groups. Students had a significant increase in handgrip strength from ages 18-19 (38.13 kg) to ages 24-25 (42.89 kg), re­spectively. Students also had an increase in FFM from ages 18-19 (57.10 kg) to ages 22-23 (61.82kg), respective­ly. CONCLUSION: The results demonstrated that college-aged students have both and increase and decrease in measures of fitness and body composition

Agreement Study Between the ParvoMedics TrueOne 2400 and Vacu-Med Vista MINI-CPX Metabolic Measurement System

Aerobic capacity (VO2 MAX) predicts both athletic performance and health status. Many tools are available to assess VO2 MAX ranging in both cost and accuracy. Understanding limitations of less expensive tools, likely found in settings such as health clinics or sports performance facilities, will help practitioners in developing accurate exercise prescriptions for their respective populations. To evaluate agreement lower cost VO2 MAX assessment tool (Vacu-Med Vista MINI-CPX) to the industry “gold standard” (ParvoMedics TrueOne 2400). Thirty-one participants (22.5 ± 3.5 years; BMI 24.9 ± 2.3; 51% female) completed two sessions of maximal VO2 MAX assessment using the Bruce Protocol graded treadmill exercise test. The first session of assessment utilized the “gold-standard” unit (TrueOne 2400, ParvoMedics, Inc., Murray, UT). 24-48 hours later the second unit (Vista Mini-CPX, Vacu-Med, Inc., Ventura, CA) was used to assess VO2 MAX again. A Bland-Altman analyses was used to evaluate both potential bias and agreement for between the two assessment tools. The CPX unit sig­nificantly overestimated VO2 MAX compared to the TrueOne (Bias = 10.67 ± 5.87 ml/kg/min, LoA = -0.83, 22.18; t = 1.96, p \u3c .001). However, the CPX unit demonstrates good reliability as 93.5% (29/31 participants) of values fell within the 95% LoA. Further, values above 46.5 ml/kg/min tend to be greater than the mean bias while those below tend to be lower than the mean bias (r = .605, F = 16.80, p \u3c .001). The CPX unit demon­strates good reliability yet a significant overestimation of aerobic capacity

Exposure, hazard, and survival analysis of diffusion on social networks

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/144676/1/sim7658_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/144676/2/sim7658.pd

Evaluating Novel Methods of Classifying Interlimb Asymmetries Within Collegiate American Football Players

International Journal of Exercise Science 15(6): 473-487, 2022. Over the last few years, researchers and sport scientists have expressed an increased interest in the effects of interlimb asymmetry on aspects of sport performance such as jumping, sprinting, and changing direction. This study aimed to evaluate the diagnostic utility of three different means of classifying asymmetry to highlight if a 6-week resistance training intervention can meaningfully reduce levels of asymmetry, and to determine the relation between asymmetry reduction and improvements in change of direction (CoD) performance, if any. Eighteen, division-two collegiate American football skill position players completed all pre- and post-intervention procedures. These procedures involved the completion of the Bulgarian Split Squat (BSS) exercise from which asymmetries in relative average power (Rel.AP), and relative peak power (Rel.PP) were derived. Additionally, participants completed three repetitions within the 505 and L-drill tests to quantify CoD performance. Results from our study show that participants classified as asymmetrical, exhibiting observed asymmetry in Rel.PP scores larger than the sample mean plus one standard deviation, had the greatest likelihood of reducing asymmetry (OR = 6.99, 95% CI: 1.4, 12.5) and improving L-drill performance (OR = 1.33, 95% CI: -2.1, 4.8). Further, our training intervention meaningfully reduced Rel.AP asymmetry (p = 0.027, Cohen’s d = 0.73). At the group level, these reductions in asymmetry were accompanied by improvements in L-drill performance that were larger than the sample smallest worthwhile change (SWC). At the individual level, however, change scores in asymmetry and change scores in CoD performance only showed small, non-significant correlations

Incorporating a Sense of Community in a Group Exercise Intervention Facilitates Adherence

Participant attrition is detrimental for exercise intervention studies, particularly if dropout is not random. Community engagement has helped facilitate participant adherence, which is particularly applicable for group exercise programs. Developing a sense of community (SOC) helps participants feel that they belong and provides ongoing social support. This paper reports on strategies used during an 11-week high intensity functional training (HIFT) intervention with exceptionally high adherence (96.7%) that involved 30 participants (57% women, age 36.7 ± 4.5 years). Participants recorded their heart rate variability using a smartphone app daily throughout the study, completed three different weeks of fitness assessments, and attended six weeks of five days/week HIFT group exercise sessions led by a certified coach. Coaches used strategies to facilitate group interactions and individual feedback and engagement. Participants completed a follow-up survey that included 14 items from the SOC in sport scale (SCS), eight questions about group dynamics, and three open-ended study feedback questions that were coded using the SOC categories. All SCS items were highly rated (mean range = 4.51-4.93/5) as were the group dynamics items (mean range = 4.30-4.85/5). Common interests were the most mentioned SOC category in open-ended responses, and while the participants reported really enjoying the study, they provided constructive feedback for improving future studies. Using specific strategies to facilitate a SOC in exercise intervention research (e.g., group exercise, social media connections, and facilitating participant interactions) are recommended for both researchers and practitioners to avoid attrition and encourage adherence, particularly for programs with high daily participant burden

Antiandrogen withdrawal in castrate-refractory prostate cancer

BACKGROUND. Antiandrogen withdrawal is a potential therapeutic maneuver for patients with progressive prostate cancer. This study was designed to examine antiandrogen withdrawal effects within the context of a large multi-institutional prospective trial. METHODS. Eligibility criteria included progressive prostate adenocarcinoma despite combined androgen blockade. Eligible patients received prior initial treatment with an antiandrogen plus orchiectomy or luteinizing hormone-releasing hormone (LHRH) agonist. Patients were stratified according to type of antiandrogen, type of progression (prostate-specific antigen [PSA] or radiographic), presence or absence of metastatic disease, and prior LHRH agonist versus surgical castration. RESULTS. A total of 210 eligible and evaluable patients had a median follow-up of 5.0 years; 64% of patients previously received flutamide, 32% bicalutamide, and 3% nilutamide. Of the 210 patients, 21% of patients had confirmed PSA decreases of ≥50% (95% CI, 16% to 27%). No radiographic responses were recorded. Median progression-free survival (PFS) was 3 months (95% CI, 2 months to 4 months); however, 19% had 12-month or greater progression-free intervals. Median overall survival (OS) after antiandrogen withdrawal was 22 months (20 and 40 months for those with and without radiographic evidence of metastatic disease, respectively). Multivariate analyses indicated that longer duration of antiandrogen use, lower PSA at baseline, and PSA-only progression at study entry were associated with both longer PFS and OS. Longer antiandrogen use was the only significant predictor of PSA response. CONCLUSIONS. These data indicate a relatively modest rate of PSA response in patients who were undergoing antiandrogen withdrawal; however, PFS can be relatively prolonged (≥1 year) in approximately 19% of patients. Cancer 2008. © 2008 American Cancer Society.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/58635/1/23473_ftp.pd

Right ventricular outflow reconstruction with cryopreserved homografts in pediatric patients: Intermediate-term follow-up with serial echocardiographic assessment

AbstractObjectives. This study was performed to assess by echocardiography the intermediate-term outcome of cryopreserved homografts employed in pulmonary outflow reconstruction in children and to validate the reliability of Doppler echocardiography in their evaluation.Background. Cryopreserved homografts have become the most widely used pulmonary conduits. Previous reports have shown the occurrence of homograft regurgitation in the immediate postoperative period and the propensity of regurgitation to progress. Although Doppler echocardiography has been useful in assessing extracardiac valved conduit stenosis, its reliability in assessing a large series of cryopreserved homografts has not been documented.Methods. Echocardiograms of 41 patients (43 homografts) who underwent operations between December 1986 and October 1992 were retrospectively reviewed. The median age of patients at operation was 37.5 months (range 3 to 333), and the median duration of follow-up was 28.5 months (range 1 to 68). Homograft regurgitation was classified on a scale of 0 to 4+. Pressure gradients across the homografts measured in 23 catheterizations were correlated with corresponding echocardiographic gradients.Results. Regurgitation: Homograft regurgitation occurred in 100% of patients at follow-up. Progression of severity >2 grades occurred during follow-up in 35% and was associated with operation before age 18 months (p < 0.002) and stenosis progression (p < 0.05) but not with homograft type (aortic or pulmonary). These data predict that 50% of patients operated on before 18 months of age will have severe regurgitation by 15 months postoperatively compared with only 15% operated on after 18 months. Stenosis: At follow-up, 51% of homografts had a stenotic gradient ≥25 mm Hg predominantly at the distal anastomosis, and stenosis progression was related to young age at operation (<18 months, p < 0.005) and small conduit size (p < 0.01). Fifty percent of conduits implanted before age 18 months could be predicted to stenose by 21.8 months compared with only 5% of those implanted after age 18 months. The gradient measured from Doppler echocardiography correlated well with the catheterization gradient (r = 0.86).Conclusions. Cryopreserved homograft dysfunction is frequent and progressive. Young age at operation (<18 months) predicts more rapid deterioration. Doppler echocardiography is reliable in assessing the systolic gradients across homografts. Serial echocardiographic assessment in the follow-up of these patients accurately characterizes these problems

Solstice: An Electronic Journal of Geography and Mathematics: Vol. 29, No. 1

This particular issue of Solstice is a Special Issue devoted to Meridian MS renaissance.Contains journal articles and one supporting animation for the cover to Volume XXIX, Number 1, of Solstice: An Electronic Journal of Geography and Mathematics.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/144499/1/SolsticeJune2018Final.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/144499/3/QRcover.gif284Description of SolsticeJune2018Final.pdf : Solstice, Vol. XXIX, No. 1.Description of QRcover.gif : Animation attached in pdf.Description of SolsticeJune2018Final.docx : Word file; base for pdf.Description of SolsticeJune2018Final.docx : Word file; base for pdf

Solstice: An Electronic Journal of Geography and Mathematics: Vol. 30, No. 1

30th year of publication of this electronic journal (born digital in 1990).Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/149577/1/SolsticeJune2019Final.pdf8284Description of SolsticeJune2019Final.pdf : Solstice, Vol. XXX, No. 1