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Arevalo JA, McLeland KA, Brown LE, Galpin AJ, Coburn JW. Comparison Of Classic Fatigability And Peak Torque Tests Used To Estimate Fast-Twitch Muscle Fiber Composition. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000478204.55241.d2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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McLeland KA, Arevalo JA, Bagley JR, Ciccone AB, Brown LE, Coburn JW, Galpin AJ. A Reexamination Of Fatigability And Fiber Composition Of Human Skeletal Muscle. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000477315.71923.5e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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53
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Rosengarten JJ, Whitcomb B, Fippinger M, Coburn JW, Wiersma LD, Judelson DA, Galpin AJ. The Effects Of Intermittent Actual And Perceived Cooling On Repeated Bouts Of High Intensity Exercise. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000476766.70942.a0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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54
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Crum BN, Coburn JW, Brown LE, Galpin AJ. Acute Effects Of Alkaline Water On High Intensity Anaerobic Performance. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000478867.70180.33] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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55
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Beaudette TL, Brown LE, Coburn JW, Lynn SK, Dunnick DD. Acute Effects Of Assisted Jumping On Relative Peak Power And Peak Velocity Of A Veritcal Jump. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000478153.86628.0d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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56
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Record SM, Malyszek KK, Davis KA, Harmon R, Manolovitz A, Steele J, Brown LE, Coburn JW, Galpin AJ. Acute Effects Of Elastic Bands On Force, Velocity, And Power During Deadlifts At Various Loads. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000479284.56105.1b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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57
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Dunnick DD, Barillas SR, Brown LE, Coburn JW, Lynn SK. Upper Body Muscle Activation Between Stable And Unstable Load During Eccentric Bench Press. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000479246.19773.da] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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58
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Soria A, Coburn JW, Brown LE, Kersey R. Hip Abductor and Adductor Strength and Medial Tibial Stress Syndrome in Collegiate Distance Runners. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000479294.09471.04] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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59
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Rojo VM, Coburn JW. The Effects Of Self-selected Music On Recovery From A Fatiguing Bout Of Isokinetic Leg Extensions. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000476966.65461.ac] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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60
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Barillas SR, Dunnick DD, Brown LE, Coburn JW, Lynn SK. Upper Body Muscle Activation Between Stable And Unstable Load During Concentric Bench Press. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000479249.65514.87] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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61
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Coburn JW, Salusky IB, Norris KC, Goodman WG. Oral and parenteral calcitriol for the management of end-stage renal disease. CONTRIBUTIONS TO NEPHROLOGY 2015; 90:166-82. [PMID: 1959343 DOI: 10.1159/000420140] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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62
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Llach F, Brickman AS, Coburn JW. Unique effects of 24,25-dihydroxyvitamin D3 in uremic patients. CONTRIBUTIONS TO NEPHROLOGY 2015; 18:212-7. [PMID: 7353377 DOI: 10.1159/000403288] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The effects of 24,25-dihydroxyvitamin D3 (24,25[OH]2D3), given orally for 7-10 days at doses of 2 and 4 microgram/day, were evaluated in patients with advanced renal failure. There was a significant fall in serum Ca and a rise in alkaline phosphatase; both returned to pretreatment levels 2 weeks after cessation of therapy. There was no change in intestinal absorption of 47Ca. These observations are significantly different from those observed during treatment with 1,25(OH)2D3 or 25(OH)D3, indicating that different vitamin D sterols can clearly exert different biologic effects.
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Wong EG, Siemsen AW, Sugihara JG, Coburn JW. Interactions between treatment with 1,25(OH)2D3 and glucocorticoids in uremic patients after kidney transplantation. CONTRIBUTIONS TO NEPHROLOGY 2015; 18:152-61. [PMID: 6986228 DOI: 10.1159/000403283] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
3 patients undergoing maintenance hemodialysis and receiving 1,25(OH)2D3 for osteomalacic bone disease received cadaveric kidney grafts and concomitant glucocorticoid therapy. The administration of pharmacological doses of glucocorticoids increased the dosage of 1,25(OH)2D3 needed to maintain a normal serum calcium level 7- to 10-fold in 2 patients whose renal grafts failed to function, but there was no decrease in sensitivity to 1,25(OH)2D3 in 1 patient whose renal graft functioned normally. These data suggest that steroids given to a uremic patient may block certain effects normally produced by 1,25(OH)2D3. An end-organ defect due to the combined effects of steroids and uremia is possible.
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Sherrard DJ, Coburn JW, Brickman AS, Singer FR, Maloney N. Skeletal response to treatment with 1,25-dihydroxyvitamin D in renal failure. CONTRIBUTIONS TO NEPHROLOGY 2015; 18:92-7. [PMID: 7353382 DOI: 10.1159/000403276] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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65
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Norman AW, Coburn JW, Schaefer K. Recent advances in the endocrinology of vitamin D and implications for renal failure. CONTRIBUTIONS TO NEPHROLOGY 2015; 14:190-207. [PMID: 214273 DOI: 10.1159/000402360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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66
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Brickman AS, Coburn JW, Sherrard DJ, Wong EG, Norman AW, Singer FR. Clinical effects of 1,25-dihydroxyvitamin D3 in uremic patients with overt osteodystrophy. CONTRIBUTIONS TO NEPHROLOGY 2015; 18:29-41. [PMID: 7353378 DOI: 10.1159/000403271] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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67
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Coburn JW, Sherrard DJ, Brickman AS, Wong EG, Norman AW, Singer FR. A skeletal mineralizing defect in dialysis patients: a syndrome resembling osteomalacia but unrelated to viatamin D. CONTRIBUTIONS TO NEPHROLOGY 2015; 18:172-83. [PMID: 7353374 DOI: 10.1159/000403285] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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68
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Rubin DA, Pham HN, Adams ES, Tutor AR, Hackney AC, Coburn JW, Judelson DA. Endocrine response to acute resistance exercise in obese versus lean physically active men. Eur J Appl Physiol 2015; 115:1359-66. [DOI: 10.1007/s00421-015-3105-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 01/11/2015] [Indexed: 11/28/2022]
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69
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Ciccone AB, Cho AL, Hafenstine R, Pereira MC, Brown LE, Coburn JW, Galpin AJ. Effects of Traditional vs. Alternating Whole-Body Strength Training on Rate of Force Development and Volume. Med Sci Sports Exerc 2014. [DOI: 10.1249/01.mss.0000493937.11134.c5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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70
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Cho AL, Ciccone AB, Hafenstine R, Pereira MC, Brown LE, Coburn JW, Galpin AJ. Alternating Whole-Body Strength Training Increases Time to Peak Ground Reaction Force Across Multiple Sets. Med Sci Sports Exerc 2014. [DOI: 10.1249/01.mss.0000493968.78853.80] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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71
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Du Bois AM, Nelson GC, Ciccone AB, April SM, Thurston TS, Brown LE, Coburn JW, Galpin AJ, Judelson DJ. Effect Of Serial Apneas And Facial Immersion On High Intensity Aerobic Performance. Med Sci Sports Exerc 2014. [DOI: 10.1249/01.mss.0000495581.06853.6c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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72
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Al-Majid S, Wilson LD, Rakovski C, Coburn JW. Effects of exercise on biobehavioral outcomes of fatigue during cancer treatment: results of a feasibility study. Biol Res Nurs 2014; 17:40-8. [PMID: 25504949 DOI: 10.1177/1099800414523489] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
UNLABELLED Cancer treatment is associated with decreased hemoglobin (Hb) concentration and aerobic fitness (VO2 max), which may contribute to cancer-related fatigue (CRF) and decreased quality of life (QoL). Endurance exercise may attenuate CRF and improve QoL, but the mechanisms have not been thoroughly investigated. Objectives. To (a) determine the feasibility of conducting an exercise intervention among women receiving treatment for breast cancer; (b) examine the effects of exercise on Hb and VO2 max and determine their association with changes in CRF and QoL; and (c) investigate changes in selected inflammatory markers. Methods. Fourteen women receiving chemotherapy for Stages I-II breast cancer were randomly assigned to exercise (n = 7) or usual care (n = 7). Women in the exercise group performed supervised, individualized treadmill exercise 2-3 times/week for the duration of chemotherapy (9-12 weeks). Data were collected 4 times over 15-16 weeks. Results. Recruitment rate was 45.7%. Sixteen women consented and 14 completed the trial, for a retention rate of 87.5%. Adherence to exercise protocol was 95-97%, and completion of data collection was 87.5-100%. Exercise was well tolerated. VO2 max was maintained at prechemotherapy levels in exercisers but declined in the usual-care group (p < .05). Hb decreased (p < .001) in all participants as they progressed through chemotherapy. Exercise did not have significant effects on CRF or QoL. Changes in inflammatory markers favored the exercise group. CONCLUSIONS Exercise during chemotherapy may protect against chemotherapy-induced decline in VO2 max but not Hb concentration.
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73
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Tan JG, Coburn JW, Brown LE, Judelson DA. Effects of a single bout of lower-body aerobic exercise on muscle activation and performance during subsequent lower- and upper-body resistance exercise workouts. J Strength Cond Res 2014; 28:1235-40. [PMID: 24531438 DOI: 10.1519/jsc.0000000000000413] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A single bout of lower-body aerobic exercise may negatively affect a subsequent lower-body resistance exercise workout. However, less is known regarding the effects of a lower-body aerobic workout on muscle activation and performance during a subsequent upper-body resistance exercise workout. Therefore, the purpose of this study was to compare muscle activation and performance during lower- and upper-body resistance exercise workouts after a single bout of lower-body aerobic exercise on an elliptical machine. Fourteen men (mean age = 24.1 ± 2.3 years, height = 180.8 ± 6.9 cm, body mass = 91.9 ± 16.4 kg) completed 4 trials in random order. Two trials consisted of 30 minutes on the elliptical machine, using the lower body only, at 70% of age-predicted maximum heart rate before either a back squat or bench press workout, consisting of 3 sets to failure performed at 75% 1 repetition maximum. The other 2 trials consisted of only the back squat or bench press resistance workouts. To quantify muscle activation, bipolar surface electromyography electrodes were placed on the rectus femoris and vastus lateralis or pectoralis major. Acute lower-body aerobic exercise on an elliptical machine significantly reduced the number of repetitions completed for the back squat but not the bench press exercise. There was no significant difference in muscle activation between the elliptical and no elliptical conditions. However, for both exercises and conditions, muscle activation increased significantly between the first and final repetitions for the first 2 sets but not for the third set. These results suggest that to optimize the quality of a lower-body resistance-training workout, the workout should not be preceded by lower-body aerobic exercise.
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Cochrane KC, Coburn JW, Brown LE, Judelson DA. Effects of diverting activity on strength, electromyographic, and mechanomyographic signals. J Strength Cond Res 2014; 28:1203-11. [PMID: 24531432 DOI: 10.1519/jsc.0000000000000378] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The purpose of this study was to investigate the effects of different recovery interventions on peak torque, electromyographic (EMG), and mechanomyographic (MMG) measures. Ten (23.40 ± 1.00 years; 178.40 ± 5.03 cm; 84.80 ± 15.85 kg) recreationally trained college men performed 4 experimental visits consisting of 2 bouts of 50 maximal isokinetic leg extensions at 180°·s(-1). Between each bout of maximal exercise, 2 minutes of recovery involving one of the 4 interventions (passive, active, passive diverting, and active diverting) was completed. Electromyographic and MMG measures were collected during the preintervention and postintervention maximal isokinetic strength tests. Peak torque declined to a significantly greater degree during the postintervention test in the passive condition than the other interventions. Electromyographic amplitude decreased on the postintervention test but did not differ between conditions. There was a significant 2-way interaction for EMG mean power frequency (MPF) between time and repetitions. There was a significant decrease in EMG MPF from the first 3 to the last 3 repetitions for both the preintervention and postintervention tests. The decrease in EMG MPF from the initial to final repetitions was greater for the preintervention test than the postintervention test. Mechanomyographic amplitude significantly decreased from the initial to final repetitions regardless of time or condition. These findings suggest that active, passive diverting, and active diverting strategies provide the same extent of recovery between maximal, fatiguing isokinetic leg extension tasks, and that these strategies can be used by coaches and exercise professionals to select the most effective interset recovery strategy.
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Moyen NE, Ellis CLV, Ciccone AB, Thurston TS, Cochrane KC, Brown LE, Coburn JW, Judelson DA. Increasing Relative Humidity Impacts Low-Intensity Exercise in the Heat. ACTA ACUST UNITED AC 2014; 85:112-9. [DOI: 10.3357/asem.3787.2014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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76
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Jackson MC, Brown LE, Coburn JW, Judelson DA, Cullen-Carroll N. Towards Standardization of the Nomenclature of Resistance Training Exercises. J Strength Cond Res 2013; 27:1441-9. [DOI: 10.1519/jsc.0b013e318289168d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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77
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LaPorta JW, Brown LE, Coburn JW, Galpin AJ, Tufano JJ, Cazas VL, Tan JG. Effects of Different Footwear on Vertical Jump and Landing Parameters. J Strength Cond Res 2013; 27:733-7. [DOI: 10.1519/jsc.0b013e318280c9ce] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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78
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Malek MH, Hüttemann M, Lee I, Coburn JW. Similar skeletal muscle angiogenic and mitochondrial signalling following 8 weeks of endurance exercise in mice: discontinuousversuscontinuous training. Exp Physiol 2013. [DOI: 10.1113/expphysiol.2012.070169] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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79
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Cazas VL, Brown LE, Coburn JW, Galpin AJ, Tufano JJ, LaPorta JW, Du Bois AM. Influence of Rest Intervals After Assisted Jumping on Bodyweight Vertical Jump Performance. J Strength Cond Res 2013; 27:64-8. [DOI: 10.1519/jsc.0b013e3182772f13] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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80
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Gallegos BG, Brown LE, Coburn JW, Galpin AJ, Cazas VL. No effect of a single remote voluntary contraction on performance in women soccer players. J Strength Cond Res 2012; 27:416-20. [PMID: 23222074 DOI: 10.1519/jsc.0b013e31827de1b2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Remote voluntary contractions (RVCs) are defined as muscle contractions remote from, yet concurrent with, the prime mover. Previous studies suggest this phenomenon may produce an ergogenic effect on performance. Currently, little research has examined the effects of a single RVC on complex performance in women athletes. The purpose of this study was to examine the effect of RVC on kick velocity and throw-in velocity in women soccer players. Fourteen women with competitive soccer experience in the past 2 years participated. Subjects performed 3 maximal effort kicks and 3 maximal effort throw-ins with and without RVC. The RVC condition consisted of maximal jaw clenching on a mouth guard during the concentric phase of each kick and each throw-in. During the control condition (CON), subjects were instructed to keep their mouths open, and no mouth guards were used. Analyses demonstrated RVC had no effect on kick velocity (CON: 65.65 ± 8.38 km·hr(-1), RVC: 66.90 ± 9.40 km·hr(-1) or throw-in velocity (CON: 49.55 ± 5.65 km·hr(-1), RVC: 49.31 ± 3.81 km·hr(-1)). In conclusion, RVC via jaw clenching does not appear to enhance or negate kick or throw-in velocity in women soccer players. Therefore, athletes and coaches may choose to use mouth guards as they see fit.
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Biagini MS, Brown LE, Coburn JW, Judelson DA, Statler TA, Bottaro M, Tran TT, Longo NA. Effects of self-selected music on strength, explosiveness, and mood. J Strength Cond Res 2012; 26:1934-8. [PMID: 22033366 DOI: 10.1519/jsc.0b013e318237e7b3] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
There has been much investigation into the use of music as an ergogenic aid to facilitate physical performance. However, previous studies have primarily focused on predetermined music and aerobic exercise. The purpose of this study was to investigate the effects of self-selected music (SSM) vs. those of no music (NM) on the mood and performance of the athletes performing bench press and squat jump. Twenty resistance trained collegiate men completed 2 experimental conditions, one while listening to SSM and the other with NM. The subjects reported their profile of mood states (POMS) and rating of perceived exertion (RPE) before and after performing 3 sets to failure of the bench press at 75% 1 repetition maximum (1RM) and 3 reps of the squat jump at 30% 1RM. Statistical analyses revealed no differences in squat jump height or relative ground reaction force, but the takeoff velocity (SSM-2.06 ± 0.17 m·s(-1); NM-1.99 ± 0.18 m·s(-1)), rate of velocity development (SSM-5.92 ± 1.46 m·s(-2); NM-5.63 ± 1.70 m·s(-2)), and rate of force development (SSM-3175.61 ± 1792.37 N·s(-1); NM-2519.12 ± 1470.32 N·s(-1)) were greater with SSM, whereas RPE (SSM-5.71 ± 1.37; NM-6.36 ± 1.61) was greater with NM. Bench press reps to failure and RPE were not different between conditions. The POMS scores of vigor (SSM-20.15 ± 5.58; NM-17.45 ± 5.84), tension (SSM-8.40 ± 3.99; NM-6.07 ± 3.26), and fatigue (SSM-8.65 ± 4.49; NM-7.40 ± 4.38) were greater with SSM. This study demonstrated increased performance during an explosive exercise and an altered mood state when listening to SSM. Therefore, listening to SSM might be beneficial for acute power performance.
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Tufano JJ, Brown LE, Coburn JW, Tsang KK, Cazas VL, LaPorta JW. Effect of Aerobic Recovery Intensity on Delayed-Onset Muscle Soreness and Strength. J Strength Cond Res 2012; 26:2777-82. [DOI: 10.1519/jsc.0b013e3182651c06] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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84
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Richardson KL, Coburn JW, Beam WC, Brown LE. Effects of isocaloric carbohydrate vs. carbohydrate-protein supplements on cycling time to exhaustion. J Strength Cond Res 2012; 26:1361-5. [PMID: 22516909 DOI: 10.1519/jsc.0b013e318248d774] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The purpose of this study was to investigate the effects of isocaloric carbohydrate (CHO) and carbohydrate-protein (CHO-Pro) supplements on time to exhaustion. Eleven moderately aerobically fit adults (V[Combining Dot Above]O2max= 48.3 ± 6.5 ml·kg·min) performed a maximal cycle ergometer test for the determination of V[Combining Dot Above]O2max. At least 72 hours later, the participants performed a time-to-exhaustion test at a power output equivalent to the power output when subjects were at 75% of their V[Combining Dot Above]O2max. Either the CHO or the CHO-Pro supplement was administered at 0, 30, 60, 90, and 120 minutes after this test. After 3 hours of recovery and supplement ingestion, a second time-to-exhaustion test was performed. This testing protocol was repeated for the third visit, but the supplement not given during the second visit was administered. The results indicated that there was no significant difference in time to exhaustion after isocaloric CHO (pretest 22.4 ± 2.84 minutes, posttest 25.4 ± 4.45 minutes) and CHO-Pro (pretest 22.3 ± 3.46 minutes, posttest 24.0 ± 5.08 minutes) supplementation. Carbohydrate and CHO-Pro ingestion after exercise appear to have similar effects on short-term recovery.
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Muñoz CX, Carney KR, Schick MK, Coburn JW, Becker AJ, Judelson DA. Effects of oral rehydration and external cooling on physiology, perception, and performance in hot, dry climates. Scand J Med Sci Sports 2012; 22:e115-24. [PMID: 22862563 DOI: 10.1111/j.1600-0838.2012.01510.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/24/2012] [Indexed: 12/27/2022]
Abstract
Only limited research evaluates possible benefits of combined drinking and external cooling (by pouring cold water over the body) during exercise. Therefore, this study examined cold water drinking and external cooling on physiological, perceptual, and performance variables in hot, dry environments. Ten male runners completed four trials of walking 90 min at 30% VO(2max) followed by running a 5-km time trial in 33 ± 1 °C and 30 ± 4% relative humidity. Trials examined no intervention (CON), oral rehydration (OR), external cooling (EC), and oral rehydration plus external cooling (OR + EC). Investigators measured rectal temperature, skin temperatures, heart rate, thirst, thermal sensation, and ratings of perceived exertion (RPE). Oral rehydration (OR and OR + EC) significantly lowered heart rate (P < 0.001) and thirst (P < 0.001) compared with nondrinking (CON and EC) during low-intensity exercise. External cooling (EC and OR + EC) significantly reduced chest and thigh temperature (P < 0.001), thermal sensation (P < 0.001), and RPE (P = 0.041) compared with non-external cooling (CON and OR) during low-intensity exercise. Performance exhibited no differences (CON = 23.86 ± 4.57 min, OR = 22.74 ± 3.20 min, EC = 22.96 ± 3.11 min, OR + EC = 22.64 ± 3.73 min, P = 0.379). Independent of OR, pouring cold water on the body benefited skin temperature, thermal sensation, and RPE during low-intensity exercise in hot, dry conditions but failed to influence high-intensity performance.
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Cramer JT, Housh TJ, Johnson GO, Coburn JW, Stout JR. Effects of a Carbohydrate-, Protein-, and Ribose-Containing Repletion Drink During 8 Weeks of Endurance Training on Aerobic Capacity, Endurance Performance, and Body Composition. J Strength Cond Res 2012; 26:2234-42. [DOI: 10.1519/jsc.0b013e3182606cec] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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87
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Malek MH, Coburn JW. The utility of electromyography and mechanomyography for assessing neuromuscular function: a noninvasive approach. Phys Med Rehabil Clin N Am 2012; 23:23-32, ix. [PMID: 22239871 DOI: 10.1016/j.pmr.2011.11.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This article introduces the utility of electromyography (EMG) and mechanomyography (MMG) for the assessment of neuromuscular function, and discusses the interpretation of the EMG and MMG signals for various exercise perturbations. The results of these studies suggest that the use of EMG and MMG to determine muscle fatigue is robust. Future studies with clinical populations are needed, however, to determine the optimal use of EMG and/or MMG for assessing muscle function in rehabilitative settings.
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Otto WH, Coburn JW, Brown LE, Spiering BA. Effects of Weightlifting vs. Kettlebell Training on Vertical Jump, Strength, and Body Composition. J Strength Cond Res 2012; 26:1199-202. [DOI: 10.1519/jsc.0b013e31824f233e] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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89
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Altamirano KM, Coburn JW, Brown LE, Judelson DA. Effects of Warm-up on Peak Torque, Rate of Torque Development, and Electromyographic and Mechanomyographic Signals. J Strength Cond Res 2012; 26:1296-301. [DOI: 10.1519/jsc.0b013e31822e7a85] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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90
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Aguirre NW, Tan JG, Coats DR, Spiering BA, Brown LE, Coburn JW, Rubin DA, Judelson DA. Effect of exercise order on endocrine and metabolic responses to concurrent exercise. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.1142.42] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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91
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Carney KR, Brown LE, Coburn JW, Spiering BA, Bottaro M. Eccentric torque–velocity and power–velocity relationships in men and women. Eur J Sport Sci 2012. [DOI: 10.1080/17461391.2011.566372] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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92
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Franks KA, Brown LE, Coburn JW, Kersey RD, Bottaro M. Effects of Motorized vs Non-Motorized Treadmill Training on Hamstring/Quadriceps Strength Ratios. J Sports Sci Med 2012; 11:71-76. [PMID: 24137064 PMCID: PMC3737846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Accepted: 12/03/2011] [Indexed: 06/02/2023]
Abstract
UNLABELLED Previous literature suggests that muscular involvement and biomechanical changes elicit different responses between overground and treadmill training. The objective of this study was to examine the effects of training on two different treadmill designs on the conventional (CR; concentric only) and functional (FR; eccentric to concentric) hamstring and quadriceps strength ratios. Fifteen men and sixteen women were randomly divided into three groups: motorized (MT), non-motorized (NMT) or control (C). Subjects completed pre and post-test isokinetic concentric and eccentric quadriceps and hamstring testing of both legs. Subjects completed 4 weeks of training on their respective treadmills with mileage increasing ½ mile each week, beginning with 2 miles. The C group did not participate in any training. The CR revealed a significant two way interaction of group x time with MT increasing (pre: 0.80 ± 0.09 to post: 0.84 ± 0.09), NMT decreasing (pre: 0.76 ± 0.13 to post: 0.74 ± 0.10), and C showing no change (pre: 0.79 ± 0.10 to post: 0.79 ± 0.09. The FR revealed a significant two way interaction of speed x sex with the FR increasing as speeds increased for men (60 degrees.s(-1): 1.04 ± 0.11; 180 degrees.s(-1): 1.66 ± 0.27; 300 degrees.s(-1): 2.36 ± 0.45) and women (60 degrees.s(-1): 1.05 ± 0.16; 180 degrees.s(-1): 1.90 ± 0.26; 300 degrees.s(-1): 2.75 ± 0.47) but women increased greater relative to men. Training mode elicited a specific change in concentric hamstring and quadriceps strength resulting in specific changes to the CR; however, neither training mode had an effect on eccentric hamstrings nor the FR. Special attention should be given to the mode of endurance training when the goal is to alter the hamstring/quadriceps CR. KEY POINTS Specificity of treadmill training had different effects on concentric strength.Specificity of treadmill training had little or no effect on eccentric strength.Conventional and functional strength ratios may give different results based on training mode.Four weeks is long enough for strength results to be apparent in untrained people.
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Tran TT, Brown LE, Coburn JW, Lynn SK, Dabbs NC. Effects of Assisted Jumping on Vertical Jump Parameters. Curr Sports Med Rep 2012; 11:155-9. [DOI: 10.1249/jsr.0b013e31825640bb] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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94
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Tran TT, Brown LE, Coburn JW, Lynn SK, Dabbs NC, Schick MK, Schick EE, Khamoui AV, Uribe BP, Noffal GJ. Effects of Different Elastic Cord Assistance Levels on Vertical Jump. J Strength Cond Res 2011; 25:3472-8. [DOI: 10.1519/jsc.0b013e318217664c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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95
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Coburn JW, Malek MH, Housh TJ, Johnson GO, Beck TW. Comparison of an accelerometer and piezoelectric contact sensor for examining the mechanomyographic signal from the vastus medialis during isometric muscle actions. ISOKINET EXERC SCI 2011. [DOI: 10.3233/ies-2011-0419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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96
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Wolfe AE, Brown LE, Coburn JW, Kersey RD, Bottaro M. Time Course of the Effects of Static Stretching on Cycling Economy. J Strength Cond Res 2011; 25:2980-4. [DOI: 10.1519/jsc.0b013e318234e55f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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97
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Malek MH, Coburn JW, Housh TJ, Rana S. Excess post-exercise oxygen consumption is not associated with mechanomyographic amplitude after incremental cycle ergometry in the quadriceps femoris muscles. Muscle Nerve 2011; 44:432-8. [DOI: 10.1002/mus.22089] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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98
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Cazas VL, Brown LE, Coburn JW, Lynn SK, Noffal GJ, Tran TT, Nguyen D, Biagini MS, Bera SG, Bottaro M. Effect Of Elastic Assistance Vs. Bodyweight Training On Vertical Jump. Med Sci Sports Exerc 2011. [DOI: 10.1249/01.mss.0000402335.80759.f7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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99
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Dabbs NC, Brown LE, Coburn JW, Lynn SK, Tran TT, Biagini MS, Garner JC. Relationship Between Bat Speed and Performance in Division I Softball Players. Med Sci Sports Exerc 2011. [DOI: 10.1249/01.mss.0000402398.51638.7e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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100
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Aguirre NW, Brown LE, Coburn JW, Lynn SK, Noffal GJ, Nguyen D, Cochrane K, Tran TT, Cazas V, Biagini MS, Bottaro M. Effect of Different Levels of Assisted Jumping on Countermovement Unloading Force and Velocity. Med Sci Sports Exerc 2011. [DOI: 10.1249/01.mss.0000401112.38145.0b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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