Journal of strength and conditioning research
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J Strength Cond Res · Nov 2010
The validity of sessionrating of perceived exertion method for quantifying training load in teamgym.
Teamgym is a new and emerging closed-skill sport, which includes tumbling, trampette, and floor programs performed by teams ranging from 6 to 12 athletes. The purpose of this study was to verify the concurrent validity of the session-rating of perceived exertion ([RPE] session-RPE) to quantifying the internal training load (ITL) of tumbling, trampette, and floor training sessions using Edwards' summated heart rate (HR)-zone method as a criterion measure. Session-RPE was obtained with 2 different instruments (i.e., CR-10 Borg's scale and visual analog scale) multiplied by the training duration (minutes). ⋯ High and significant correlations (r range: 0.77-0.85; R range: 0.59-0.85; p < 0.01) were found between Edwards' HR and the session-RPE methods and between the 2 session-RPE instruments (r range: 0.92-0.97; R2 range: 0.85-0.94; p < 0.01). The significant (p < 0.05) differences emerged between training sessions indicate that session-RPE discriminates ITL in relation to various technical skills. Hence, session-RPE can be a useful and inexpensive tool to quantify ITL in teamgym, and coaches could use this instrument to monitor their periodization plan as experienced by the athletes.
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J Strength Cond Res · Aug 2010
Acute effects of high-intensity dumbbell exercise after isokinetic eccentric damage: interaction between altered pain perception and fatigue on static and dynamic muscle performance.
This study aimed to determine whether high-intensity dumbbell exercise involving both concentric and eccentric contractions would provide a temporary alleviation of delayed-onset muscle soreness (DOMS). It also examined the effect of alleviated muscle soreness on dynamic muscle performance using a stretch-shortening cycle (SSC; peak angular acceleration and velocity of the elbow during both lowering and concentric phases) to provide indirect evidence that DOMS contributes to the dynamic performance decrement after eccentric injury. Thirteen untrained adults performed 30 maximal isokinetic eccentric contractions of the elbow flexors to induce eccentric damage. ⋯ It was concluded that high-intensity concentric/eccentric dumbbell exercise was able to temporarily alleviate DOMS and that this reduction in soreness served to counter the effect of peripheral muscle fatigue during dynamic activities. Practical applications of this study are that after eccentric damage, alleviation of muscle soreness through an optimal warm-up may be helpful to temporarily recover dynamic muscle performance. Free-weight loading is one suggested technique to temporarily manage DOMS.
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J Strength Cond Res · Jul 2010
Randomized Controlled TrialThe effects of whole-body compression garments on prolonged high-intensity intermittent exercise.
The current study investigated the effects of wearing whole-body compression garments (WBCGs) on prolonged high-intensity intermittent exercise (PHIIE) performance. Eight male team-sport athletes ([X +/- SD] 20.6 +/- 1.2 years; 72.9 +/- 5.9 kg; 57.5 +/- 3.7 ml.kg.min) completed a prescribed 45-minute PHIIE protocol on a nonmotorized treadmill in randomly assigned WBCG and control (typical soccer apparel) conditions. Subjects were given verbal and visual cues for movement categories, and they followed set target speeds, except when instructed of a variable run or sprint where the aim was to run as fast as possible. ⋯ A similar likely increase was also observed in the average TOI of the WBCG condition (53.5 +/- 8.3% vs. 55.8 +/- 7.2%; 87:11:2%; and eta = 0.6). The current data demonstrated that wearing WBCGs likely increased physical performance, possibly because of improvements in muscle oxygenation and associated metabolic benefits. Therefore, wearing WBCGs during PHIIE may benefit the physical performance of team-sport athletes by likely metabolic changes within the muscle between high-intensity efforts.
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J Strength Cond Res · Jul 2010
Randomized Controlled TrialEffects of whole-body electromyostimulation on resting metabolic rate, body composition, and maximum strength in postmenopausal women: the Training and ElectroStimulation Trial.
We evaluated the effect of whole-body electromyostimulation (WB-EMS) during dynamic exercises over 14 weeks on anthropometric, physiological, and muscular parameters in postmenopausal women. Thirty women (64.5 +/- 5.5 years) with experience in physical training (>3 years) were randomly assigned either to a control group (CON, n = 15) that maintained their general training program (2 x 60 min.wk of endurance and dynamic strength exercise) or to an electromyostimulation group (WB-EMS, n = 15) that additionally performed a 20-minute WB-EMS training (2 x 20 min.10 d). Resting metabolic rate (RMR) determined from spirometry was selected to indicate muscle mass. ⋯ Isometric strength changes of the trunk extensors and leg extensors differed significantly (p < or = 0.006) between WB-EMS and CON (9.9% vs. -6.4%, ES = 1.53; 9.6% vs. -4.5%, ES = 1.43, respectively). In summary, adjunct WB-EMS training significantly exceeds the effect of isolated endurance and resistance type exercise on fitness and fatness parameters. Further, we conclude that for elderly subjects unable or unwilling to perform dynamic strength exercises, electromyostimulation may be a smooth alternative to maintain lean body mass, strength, and power.
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J Strength Cond Res · May 2010
Comparative StudyA comparison of practical assessment methods to determine treadmill, cycle, and elliptical ergometer VO2 peak.
This investigation compared estimated and predicted peak oxygen consumption (VO2 peak) and maximal heart rate (HRmax) among the treadmill, cycle ergometer, and elliptical ergometer. Seventeen women (mean +/- SE: 21.9 +/- 0.3 y) exercised to exhaustion on all modalities. American College of Sports Medicine metabolic equations were used to estimate VO2 peak. ⋯ HRmax, and estimates of VO2 peak were similar between the treadmill and elliptical ergometer; thus, crossmodal exercise prescriptions may be generated. The use of digital display estimates of submaximal oxygen uptake for the elliptical ergometer may not be an accurate method for predicting VO2 peak. Health-fitness professionals should use caution when utilizing submaximal elliptical ergometer digital display estimates to predict VO2 peak.