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The Effects of Muscle Actions Upon Strength Gains

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De Carvalho Nogueira A., De Souza Vale R., Colado J., Tella V., Garcia-Massó X., Dantas E.

Human Movement

2011

vol. 12

issue 4

331-336

Purpose. The purpose of this study was to compare the effects of concentric with eccentric muscle actions on strength gains. Methods. Forty-two untrained men were randomly divided into three groups: the concentric experimental (CE), the eccentric experimental (EE) and a control (C). The CE group performed only concentric muscle actions at 80% of one repetition maximum (1 RM) and the EE group performed only eccentric muscle actions at 120% of 1 RM. Both groups trained by performing three sets of 10-12 repetitions for eight weeks of biceps curl (BC) and bench press (BP) exercises. The C group did not engage in any type of training. Results. Analyses performed within the CE group found that there were significant improvements in muscle strength in the eighth week of BP (Δ % = 26.9%, p = 0.01) and in the fourth and eighth week of BC (Δ % = 22.1%, p = 0.00 and Δ% = 32.1%, p = 0.00, respectively). Analyses of the EE group found that there were significant improvements in muscle strength in the fourth and eighth week of BP (Δ% = 13.7%, p = 0.00 and Δ% = 28.4%, p = 0.00, respectively). Between the two groups (CE versus EE), comparisons showed that the CE group performed significantly better than the EE group in the fourth and eighth week of BC (p = 0.00 and p = 0.00, respectively). Conclusions. These findings indicate that those who do not train should perform concentric muscle actions in the first 8 weeks of training in order to generate accelerated strength improvement.

Effects of Aquatic and Dry Land Resistance Training Devices on Body Composition and Physical Capacity in Postmenopausal Women

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Colado J., Garcia-Masso X., Rogers M., Tella V., Benavent J., Dantas E.

Journal of Human Kinetics

2012

vol. 32

185-195

To determine the effects of a supervised strength training program on body composition and physical capacity of older women using three different devices: weight machines, elastic bands, and aquatic devices that increase drag forces (ADIDF). Four groups were formed: control group, weight machine group (WMG), elastic band group (EBG) and a group that used ADIDF (ADIDFG). Body composition and physical capacity were assessed before and after the intervention period. The ADIDFG showed improvements in fat mass (FM), fat-free mass of the left arm (FFM-LA) and right arm (FFM-RA), knee push-up test (KPT), squat test (ST) and crunch test (CT) (p <0.05). Individuals in the EBG and WMG also improved their FM, fat free mass (FFM), FFM-LA, FFM-RA, KPU, ST and CT. ADIDF training improves body composition and physical capacity of postmenopausal women as does performing land-based training programs.

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1 Human Movement

1 Journal of Human Kinetics

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1 2011

2 Colado J.

2 Dantas E.

2 Tella V.

1 Benavent J.

1 De Carvalho Nogueira A.

1 De Souza Vale R.

1 Garcia-Masso X.

1 Garcia-Massó X.

1 Rogers M.

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The Effects of Muscle Actions Upon Strength Gains

Effects of Aquatic and Dry Land Resistance Training Devices on Body Composition and Physical Capacity in Postmenopausal Women