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Full-Text Articles in Kinesiology
The Effect Of A Moderately-Low And High Carbohydrate Intake On Crossfit Performance, Kurt A. Escobar, Jacobo Morales, Trisha A. Vandusseldorp
The Effect Of A Moderately-Low And High Carbohydrate Intake On Crossfit Performance, Kurt A. Escobar, Jacobo Morales, Trisha A. Vandusseldorp
International Journal of Exercise Science
International Journal of Exercise Science 9(4): 460-470, 2016. CrossFit is a metabolically demanding strength and conditioning method which performance may benefit from a carbohydrate (CHO)-rich diet. This study investigated the effect of three consecutive days of high CHO intake on CrossFit performance and corresponding metabolically -related variables in strength trained individuals. Eighteen subjects with a CHO intake of <6 g/kg/day were randomly assigned into a CHO (n = 9) or control (C) group (n =9) and underwent a 9-day training protocol. During days 1, 5, and 9, performance was measured as repetitions completed during a 12 minute CrossFit workout. Oxygen consumption (VO2), respiratory exchange ratio (RER), and blood lactate (BL) were also measured. Days 6-8, the CHO group increased CHO intake from <6 g/kg/day to 6-8 g/kg/day; the C group maintained their current intake of <6 g/kg/day. On days 6 and 7 both groups performed CrossFit workouts followed by a day of rest prior to day 9. There was a significant increase in repetitions completed in both groups in day 9 (vs. means score of day 1 + 5) (p = 0.002), but no differences between C and CHO groups (p = 0.111). However, the CHO group displayed a 15.2 repetition increase (+10.9%) in day 9, compared to 5.7 (+4.2%) by the C group. VO2, RER, and BL were not influenced by the experimental intervention. Our results suggest that the CrossFit-embraced practice of moderately-low CHO diets may be adequate in CHO during short periods of training, however, given the noted trend, extended training periods may be effected.
Eight Weeks Of Kettlebell Swing Training Does Not Improve Sprint Performance In Recreationally Active Females, Michael E. Holmstrup Ph.D., Brock T. Jensen Ph.D., William S. Evans, Emily C. Marshall
Eight Weeks Of Kettlebell Swing Training Does Not Improve Sprint Performance In Recreationally Active Females, Michael E. Holmstrup Ph.D., Brock T. Jensen Ph.D., William S. Evans, Emily C. Marshall
International Journal of Exercise Science
International Journal of Exercise Science 9(4): 437-444, 2016. The kettlebell swing (KBS), emphasizing cyclical, explosive hip extension in the horizontal plane, aligns with movement- and velocity-specificity of sprinting. The present study examined the effect of an eight-week KBS intervention on sprinting in recreationally-active females, in comparison to an eight-week intervention using the stiff-legged deadlift (SDL). Following a pre-testing session measuring 30 meter sprint and countermovement vertical jump performance, participants were divided evenly by sprint time into KBS (n=8) and SDL (n=10) cohorts. Following familiarization with the exercises, KBS met twice weekly to perform swings using the Tabata interval (20s work, …
Acute Ingestion Of L-Arginine Alpha-Ketoglutarate Fails To Improve Muscular Strength And Endurance In Rotc Cadets, Benjamin Wax, Jerry J. Mayo, Laura A. Hilton, Harris C. Mareio, Justin D. Miller, Heather E. Webb, Brian Lyons
Acute Ingestion Of L-Arginine Alpha-Ketoglutarate Fails To Improve Muscular Strength And Endurance In Rotc Cadets, Benjamin Wax, Jerry J. Mayo, Laura A. Hilton, Harris C. Mareio, Justin D. Miller, Heather E. Webb, Brian Lyons
International Journal of Exercise Science
International Journal of Exercise Science 6(2) : 91-97, 2013. L-Arginine Alpha-Ketoglutarate (AAKG) is purported to stimulate the release of nitric oxide, and is suggested to facilitate muscular performance by increasing blood flow and increase oxygen and nutrient delivery to the working muscle. However, the ergogenic benefit of AAKG during resistance exercise has not been established. Therefore the purpose of this study was to investigate the effects of acute AAKG ingestion in active ROTC Cadets on measures of one-repetition maximal strength (1RM) and muscular endurance. Nineteen apparently healthy males ingested either AAKG (3 g) or a placebo 45 minutes prior to …
Kinematic Analysis Of Four Plyometric Push-Up Variations, Laura H. Moore, Michael J. Tankovich Atc, Cscs, Bryan L. Riemann Phd, Atc, George J. Davies Dpt, Atc
Kinematic Analysis Of Four Plyometric Push-Up Variations, Laura H. Moore, Michael J. Tankovich Atc, Cscs, Bryan L. Riemann Phd, Atc, George J. Davies Dpt, Atc
International Journal of Exercise Science
International Journal of Exercise Science 5(4) : 334-343, 2012. Plyometric research in the upper extremity is limited, with the effects of open-chain plyometric exercises being studied most. Kinematic and ground reaction force data concerning closed-chain upper extremity plyometrics has yet to be examined. Twenty-one recreationally active male subjects performed four variations of plyometric push-ups in a counterbalanced order. These included box drop push-ups from 3.8 cm, 7.6 cm, 11.4 cm heights, and clap push-ups. Kinematics of the trunk, dominant extremity and both hands were collected to examine peak flight, elbow flexion at ground contact, elbow displacement, and hand separation. Additionally …
Chronic Changes In Serum Il-6 And Tnf-Α Following 12 Weeks Of Concurrent Resistance And Aerobic Exercise Are Dependent On Exercise Mode And May Affect Adaptation, Brad S. Lambert, Justin P. Dobson, Stephen F. Crouse
Chronic Changes In Serum Il-6 And Tnf-Α Following 12 Weeks Of Concurrent Resistance And Aerobic Exercise Are Dependent On Exercise Mode And May Affect Adaptation, Brad S. Lambert, Justin P. Dobson, Stephen F. Crouse
International Journal of Exercise Science: Conference Proceedings
PURPOSE: To examine physiological responses to concurrent resistance and land treadmill training (RT-LTM) compared to concurrent resistance and aquatic treadmill training (RT-ATM) and the chronic effect of each on serum TNF-α and IL-6 (cytokines associated with chronic inflammation, CVD, and skeletal muscle metabolism). METHODS: Twenty-six untrained subjects (M: n=13, 98.6±17.1kg, 182.2±6.2cm, 34±11yrs, F: n=13, 78.9±14.0kg, 165.1±5.1cm, 38±11yrs) were screened to assess VO2max, body composition (DEXA), and strength (Lifts: leg press, chest press, leg curl, lat pull, leg ext, triceps push-down, biceps curl). Subjects were then randomized into 2 groups: RT-LTM (M=6, F=7), RT-ATM (M=7, F=6). Each performed progressive …
Increase In Muscle Power Induced By Periodized Resistance Training In Elderly Women, Cláudio De Oliveira Assumpção, João Bartholomeu Neto, Christiano Bertoldo Urtado, Maria Imaculada L. Montebelo
Increase In Muscle Power Induced By Periodized Resistance Training In Elderly Women, Cláudio De Oliveira Assumpção, João Bartholomeu Neto, Christiano Bertoldo Urtado, Maria Imaculada L. Montebelo
International Journal of Exercise Science: Conference Proceedings
Resistance training (RT) has been recommended to prevent muscle force and power decrease induced by aging. Neuromuscular tests are important tools to analyze muscle force function. The objective of the present study was to analyze the behavior of lower limb muscle power of elderly women submitted to 12 weeks of periodized RT. 16 women aged 65.5±3.6 years with a minimum of one year of previous experience in strength training were selected, they performed 24 sessions of RT divided in 3 mesocycles (MA, MB and MC), of 8 sessions each, with a session frequency of twice a week. The MA with …
Strength Training And Nandrolone Decanoate Decreased Myostatin Expression, Uliana Sbeguen Stotzer, Rita De Cássia Marqueti, Milena De Moura Paschoal, Heloisa Sobreiro Selistre De Araújo
Strength Training And Nandrolone Decanoate Decreased Myostatin Expression, Uliana Sbeguen Stotzer, Rita De Cássia Marqueti, Milena De Moura Paschoal, Heloisa Sobreiro Selistre De Araújo
International Journal of Exercise Science: Conference Proceedings
Nandrolone decanoate is a androgenic anabolic steroid (AAS) which targets the satellite cells in skeletal muscles. These cells are considered the stem cells of skeletal muscle, and they are essential for muscle growth and repair. Myostatin is a negative regulator of muscle mass that inhibits myoblast proliferation and differentiation. Recognizing the mechanisms related to AAS action in skeletal muscle is critical for a better understand of muscular physiology under AAS use. The aim of this study was to investigate the effects of aquatic plyometric training (APT) with overload associated with AAS on the gastrocnemius muscle of rats. Animals were grouped …
Aquatic Plyometric Training Associated With Androgenic Anabolic Steroids Do Not Increase Muscle Mass In Rats, Uliana Sbeguen Stotzer, Rita De Cássia Marqueti, Milena De Moura Paschoal, Heloisa Sobreiro Selistre De Araújo
Aquatic Plyometric Training Associated With Androgenic Anabolic Steroids Do Not Increase Muscle Mass In Rats, Uliana Sbeguen Stotzer, Rita De Cássia Marqueti, Milena De Moura Paschoal, Heloisa Sobreiro Selistre De Araújo
International Journal of Exercise Science: Conference Proceedings
To improve athletic performance or for aesthetic reasons, athletes and no athletes may use androgenic anabolic steroids (AAS). Numerous studies have reported that aquatic plyometric training (APT) can improve muscular strength and vertical jump; however the effect of these training protocols on muscular mass are poorly investigated. The aim of this study was to investigate the effects of APT associated with AAS in the soleus, gastrocnemius (Gastro), extensor digitorium longus (EDL) and tibialis anterior (TA) skeletal muscles in rats. Animals were grouped into: sedentary (S); S with AAS (AAS); trained (T); and T with AAS (AAST). Exercised groups performed jumps …
Effects Of Carbohydrate-Protein Ingestion Post-Resistance Training In Male Rugby Players, Colin J. Coyle Msc, Bernard Donne, Nick J. Mahony
Effects Of Carbohydrate-Protein Ingestion Post-Resistance Training In Male Rugby Players, Colin J. Coyle Msc, Bernard Donne, Nick J. Mahony
International Journal of Exercise Science
Evidence suggests that carbohydrate-protein (CHO-PRO) drinks post-exercise are an advantageous nutritional recovery intervention. Resistance trained (n = 14, mean ± SD; age 19 ± 1 yr, mass 95 ± 9 kg, % fat 17 ± 4 % and BMI 28.5 ± 1.8 kg.m-2) male rugby players participated in a study investigating effects of carbohydrate (CHO) and CHO-PRO drinks on subsequent resistance exercise performance. Following an initial resistance training (RT) protocol consisting of 8 circuits of 5 discrete exercises at 10 repetition maximum (RM), participants received 10 mL.kg-1 BM of randomised sports drink (LCHO, HCHO and CHO-PRO) on …
Genetic Regulation Of Myofiber Hypertrophy?, Anna Thalacker-Mercer, Xiangqin Cui, Michael Stec, Edward Merritt, Marcas Bamman
Genetic Regulation Of Myofiber Hypertrophy?, Anna Thalacker-Mercer, Xiangqin Cui, Michael Stec, Edward Merritt, Marcas Bamman
International Journal of Exercise Science: Conference Proceedings
Introduction. Progressive, resistance exercise training (RT) induces skeletal muscle hypertrophy, increases strength, power, and quality of muscle, and is potentially the most promising method to regenerate and re-grow muscle in populations suffering from involuntary atrophy. However, we have previously shown that there is a large degree of intersubject variability for myofiber hypertrophy in response to RT with adults having no response [-16μm2 (mean myofiber growth), Non], a modest response (1111μm2, Mod), or an extreme hypertrophic response (2475μm2, Xtr). Underlying mechanisms for this differential growth response are largely unknown. Therefore, the purpose of this study was to determine whether differences in …
Type Of Encouragement Influences Peak Muscle Force In College-Age Women, Ruth M. Amagliani, John K. Petrella, Alan P. Jung
Type Of Encouragement Influences Peak Muscle Force In College-Age Women, Ruth M. Amagliani, John K. Petrella, Alan P. Jung
International Journal of Exercise Science
Purpose: To investigate if the type of encouragement during a maximal voluntary isometric contraction (MVIC) had an influence on peak muscle force in strength-trained versus untrained collegiate women. Methods: Eleven strength-trained (20.4 + 1 yr) and twelve untrained (20.8 + 1 yr) women participated in three, five-second MVICs of seated knee extension. The three trials consisted of verbal only encouragement, verbal + visual encouragement, and verbal + pain avoidance encouragement. In all three trials, the participants received the same verbal encouragement. Trials were counterbalanced to minimize any possible order effects. A repeated measure ANOVA was used to analyze data. Any …