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Articles 31 - 35 of 35
Full-Text Articles in Exercise Science
Central Hemodynamics Measured During 5 Repetition Maximum Free Weight Resistance Exercise, Jonathan S. Howard, Cherilyn N. Mclester, Thomas W. Evans, John R. Mclester
Central Hemodynamics Measured During 5 Repetition Maximum Free Weight Resistance Exercise, Jonathan S. Howard, Cherilyn N. Mclester, Thomas W. Evans, John R. Mclester
Faculty Articles
The PhysioFlow™ is a piece of equipment that uses bioimpedance cardiography to measure central hemodynamics. The purpose of this research was to explore the novel approach of monitoring central hemodynamics during free weight resistance exercise using bioimpedance cardiography throughout a 5 repetition maximum (5RM). Thirty participants ranging from beginner to advanced lifters (16 males and 14 females) completed a 5RM for back squat, seated push press, and bicep curl while connected to the PhysioFlow™ to assess the response of heart rate (HR), stroke volume (SV), cardiac output (Q), and ejection fraction (EF). Participants were cued for form and to breathe …
Effect Of Actigraph's Low Frequency Extension For Estimating Steps And Physical Activity Intensity, Yuri Feito, Lyndsey M. Hornbuckle, Lauren A. Reid, Scott E. Crouter
Effect Of Actigraph's Low Frequency Extension For Estimating Steps And Physical Activity Intensity, Yuri Feito, Lyndsey M. Hornbuckle, Lauren A. Reid, Scott E. Crouter
Faculty Articles
This study examined the effects of the ActiGraph’s (AG) low-frequency extension (LFE) filter on steps and physical activity classification in the free-living environment. Thirty-four African-American women (age, 24.5±5.2 years; BMI, 24.9±4.5 kg/m2) had daily activity measured simultaneously with an AG-GT3X+ accelerometer and a New Lifestyles NL-800 pedometer for seven days. Steps per day (steps/day) and time (minutes/day) spent in sedentary, light, and moderate-to-vigorous physical activity (MVPA) were examined with and without the LFE filter (AG-LFE and AG-N, respectively). The AG-LFE recorded more total steps (13,723±4,983 steps/day) compared to AG-N and NL-800 (6,172±2,838 and 5,817±3,037 steps/day, respectively; p<0.001). Compared to the AG-N, the AG-LFE estimated less time in sedentary behaviors (518.7±92.1 vs. 504.2±105.4 min/day, respectively; p<0.001), and more time in light (247.7±70.4 vs. 279.1±74.7 min/day, respectively; p<0.001) and MVPA (18.9±16.9 vs. 21.5±18.2 min/day, respectively; p<0.001), respectively. These data suggest that steps and physical activity classifications will be affected when using the ActiGraph with and without the LFE filter. Future research should investigate the accuracy of these measures using the LFE filter.
The Effect Of Post-Resistance Exercise Amino Acids On Plasma Mcp-1 And Ccr2 Expression, Adam J. Wells, Jay R. Hoffman, Adam R. Jajtner, Alyssa N. Varanoske
The Effect Of Post-Resistance Exercise Amino Acids On Plasma Mcp-1 And Ccr2 Expression, Adam J. Wells, Jay R. Hoffman, Adam R. Jajtner, Alyssa N. Varanoske
Faculty Articles
The recruitment and infiltration of classical monocytes into damaged muscle is critical for optimal tissue remodeling. This study examined the effects of an amino acid supplement on classical monocyte recruitment following an acute bout of lower body resistance exercise. Ten resistance-trained men (24.7 ˘ 3.4 years; 90.1 ˘ 11.3 kg; 176.0 ˘ 4.9 cm) ingested supplement (SUPP) or placebo (PL) immediately post-exercise in a randomized, cross-over design. Blood samples were obtained at baseline (BL), immediately (IP), 30-min (30P), 1-h (1H), 2-h (2H), and 5-h (5H) post-exercise to assess plasma concentrations of monocyte chemoattractant protein 1 (MCP-1), myoglobin, cortisol and insulin …
Comparison Of High-Intensity Vs. High-Volume Resistance Training On The Bdnf Response To Exercise, David D. Church, Jay R. Hoffman, Gerald T. Mangine, Adam R. Jajtner
Comparison Of High-Intensity Vs. High-Volume Resistance Training On The Bdnf Response To Exercise, David D. Church, Jay R. Hoffman, Gerald T. Mangine, Adam R. Jajtner
Faculty Articles
This study compared the acute and chronic response of circulating plasma brain-derived neurotrophic factor (BDNF) to high-intensity low-volume (HI) and low-intensity high volume (HV) resistance training. Twenty experienced resistance-trained men (23.5 ± 2.6 y, 1.79 ± 0.05 m, 75.7 ± 13.8 kg) volunteered for this study. Before the resistance training program (PRE), participants performed an acute bout of exercise using either the HI [3-5 reps; 90% of one repetition maximum (1RM)] or HV (10–12 reps; 70% 1RM) training paradigm. The acute exercise protocol was repeated after 7 wk of training (POST). Blood samples were obtained at rest (BL), immediately (IP), …
Unaccustomed Exercise Causes Rhabdomyolysis, Yuri Feito
Unaccustomed Exercise Causes Rhabdomyolysis, Yuri Feito
Faculty Articles
Cross Fit TM is a relatively new strength and conditioning program defined as “constantly varied, functional movements, performed at a high intensity”. The goal of the program is to increase “work capacity across broad time and modal domains” [1]. Even though this training modality has been criticized by the main stream media for “high risk of injury” most of these claims have been anecdotal, as recent evidence suggest this training modality is not any more “dangerous” than other exercise programs [2]. One of the biggest criticisms of this training modality has been its association with Rhabdomyolysis, a condition that results …