scholarly journals Differential effects of strength training leading to failure versus not to failure on hormonal responses, strength, and muscle power gains

2006 ◽  
Vol 100 (5) ◽  
pp. 1647-1656 ◽  
Author(s):  
Mikel Izquierdo ◽  
Javier Ibañez ◽  
Juan José González-Badillo ◽  
Keijo Häkkinen ◽  
Nicholas A. Ratamess ◽  
...  
Keyword(s):  
Resistance Training ◽  
Strength Training ◽  
Power Output ◽  
Bench Press ◽  
Muscle Power ◽  
Total Testosterone ◽  
Physically Active ◽  
Power Testing ◽  
Muscle Power Output ◽  
Igfbp 3

The purpose of this study was to examine the efficacy of 11 wk of resistance training to failure vs. nonfailure, followed by an identical 5-wk peaking period of maximal strength and power training for both groups as well as to examine the underlying physiological changes in basal circulating anabolic and catabolic hormones. Forty-two physically active men were matched and then randomly assigned to either a training to failure (RF; n = 14), nonfailure (NRF; n = 15), or control groups (C; n = 13). Muscular and power testing and blood draws to determine basal hormonal concentrations were conducted before the initiation of training (T0), after 6 wk of training (T1), after 11 wk of training (T2), and after 16 wk of training (T3). Both RF and NRF resulted in similar gains in 1-repetition maximum bench press (23 and 23%) and parallel squat (22 and 23%), muscle power output of the arm (27 and 28%) and leg extensor muscles (26 and 29%), and maximal number of repetitions performed during parallel squat (66 and 69%). RF group experienced larger gains in the maximal number of repetitions performed during the bench press. The peaking phase (T2 to T3) after NRF resulted in larger gains in muscle power output of the lower extremities, whereas after RF it resulted in larger gains in the maximal number of repetitions performed during the bench press. Strength training leading to RF resulted in reductions in resting concentrations of IGF-1 and elevations in IGFBP-3, whereas NRF resulted in reduced resting cortisol concentrations and an elevation in resting serum total testosterone concentration. This investigation demonstrated a potential beneficial stimulus of NRF for improving strength and power, especially during the subsequent peaking training period, whereas performing sets to failure resulted in greater gains in local muscular endurance. Elevation in IGFBP-3 after resistance training may have been compensatory to accommodate the reduction in IGF-1 to preserve IGF availability.

scholarly journals Validity of Mechanical Power Output Measurement at Bench Press Exercise

2009 ◽  
Vol 21 (1) ◽  
pp. 33-40 ◽  
Author(s):  
Daniel Jandaĉka ◽  
František Vaverka
Keyword(s):  
Power Output ◽  
Bench Press ◽  
Muscle Power ◽  
Force Measurement ◽  
Indirect Measurement ◽  
Mechanical Power ◽  
Output Measurement ◽  
Mechanical Power Output ◽  
Significant Difference ◽  
Muscle Power Output

Validity of Mechanical Power Output Measurement at Bench Press ExerciseIn sport training and rehabilitation practice, it is usual to use methods of mechanical muscle power output measurement, which are based mainly on indirect force measurement. The aim of this study was to verify the validity of indirect measurement for mechanical muscle power output with bench press exercise. As a criterion of validity, we selected a combination of kinematic and dynamic analyses. Ten men participated in this study. Average age of tested subjects was 28.0 ± 3.4 years. At mechanical power output measurement, these subjects lifted at maximum possible speed loads of 18, 26.5, 39.2 and 47.7 kg. Validity of mechanical power output measurement by means of a method using indirect force measurement was estimated using Spearmen's Correlation Coefficient. Factual significance of differences in average values of power output, force and velocity, measured by a method using indirect force measurement, in comparison to the selected criterion, was evaluated by means of effect of size. Power output measurement method using indirect force measurement showed lower values of force in relation to the criterion in the whole scope of selected loads. Velocity values in the whole scope of selected loads did not show any significant difference between the criterion and the verified method. The mechanical muscle power output measured by the method using indirect force measurement is lower in relation to the criterion, especially in the low scope of loads, where also validity rate was low (R = 0.5).

scholarly journals Effects of cross-bridge compliance on the force-velocity relationship and muscle power output

PLoS ONE ◽  
2017 ◽  
Vol 12 (12) ◽  
pp. e0190335 ◽  
Author(s):  
Axel J. Fenwick ◽  
Alexander M. Wood ◽  
Bertrand C. W. Tanner
Keyword(s):  
Power Output ◽  
Muscle Power ◽  
Cross Bridge ◽  
Velocity Relationship ◽  
Force Velocity ◽  
Muscle Power Output

scholarly journals What Is the Optimal Strength Training Load to Improve Swimming Performance? A Randomized Trial of Male Competitive Swimmers

2021 ◽  
Vol 18 (22) ◽  
pp. 11770
Author(s):  
Sofiene Amara ◽  
Emmet Crowley ◽  
Senda Sammoud ◽  
Yassine Negra ◽  
Raouf Hammami ◽  
...  
Keyword(s):  
Resistance Training ◽  
Strength Training ◽  
Bench Press ◽  
Swimming Performance ◽  
Training Volume ◽  
Front Crawl ◽  
Leg Extension ◽  
Low Resistance ◽  
Volume Load ◽  
Competitive Swimmers

This study aimed to compare the effectiveness of high, moderate, and low resistance training volume-load of maximum strength training on muscle strength and swimming performance in competitive swimmers. Thirty-three male swimmers were randomly allocated to high (age = 16.5 ± 0.30 years), moderate (age = 16.1 ± 0.32 years) and a low resistance training volume-load group (age = 15.9 ± 0.31). This study was carried out in mid-season (January to March). Pre and post strength (e.g., repetition maximum [1RM] leg extension and bench press tests), swimming (25, 50 m front-crawl), start (speed, time, distance) and turn (time of turn) performance tests were conducted. Our findings revealed a large main effect of time for 1RM bench press: d = 1.38; 1RM leg extension: d = 1.55, and for 25 (d = 1.12), and 50 m (d = 1.97) front-crawl, similarly for start and turn performance (d = 1.28–1.46). However, no significant Group × Time interactions were shown in all strength swimming performances, start and turn tests (p > 0.05). In conclusion, low training loads have been shown to elicit the same results as moderate, and high training loads protocol. Therefore, this study shows evidence that the addition of low training volume-loads as a regular part of a maximal strength training regime will elicit improvements in strength and swimming performance.

Role of muscle power output as a mediator between gait variability and gait velocity in hospitalized older adults

2019 ◽  
Vol 124 ◽  
pp. 110631 ◽  
Author(s):  
Mikel L. Sáez de Asteasu ◽  
Nicolás Martínez-Velilla ◽  
Fabricio Zambom-Ferraresi ◽  
Álvaro Casas-Herrero ◽  
Robinson Ramirez-Vélez ◽  
...  
Keyword(s):  
Older Adults ◽  
Power Output ◽  
Muscle Power ◽  
Gait Variability ◽  
Gait Velocity ◽  
Hospitalized Older Adults ◽  
Muscle Power Output

Listening to Music Affects Diurnal Variation in Muscle Power Output

2011 ◽  
Vol 33 (01) ◽  
pp. 43-47 ◽  
Author(s):  
H. Chtourou ◽  
A. Chaouachi ◽  
O. Hammouda ◽  
K. Chamari ◽  
N. Souissi
Keyword(s):  
Diurnal Variation ◽  
Power Output ◽  
Muscle Power ◽  
Muscle Power Output
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