None listed
Conditions
Brief summary
The aim was to analyze whether increasing the eccentric overload during resistance training in terms of range of motion and/or velocity using an electric-motor device, would induce different muscle adaptations than conventional flywheel eccentric overload resistance training. Despite the different eccentric overloads offered by each device, 6 weeks of resistance training using flywheel or electric-motor devices could induce different significant gains in strength, muscle power, vertical jump, and muscle mass.
Interventions
Forty healthy males participated in the study. They were randomly divided into 3 experimental training groups and 1 control group, which did not train. Participants in the training groups completed 6 weeks (12 sessions) of unilateral, flywheel, single-leg squat resistance exercise. In two of the groups, the resistance was generated by an electric-motor device, configured in iso-inertial mode, and employing two different velocities in the eccentric actions; 100% with respect to concentric speed (
Forty healthy males participated in the study. They were randomly divided into 3 experimental training groups and 1 control group, which did not train. Participants in the training groups completed 6 weeks (12 sessions) of unilateral, flywheel, single-leg squat resistance exercise. In two of the groups, the resistance was generated by an electric-motor device, configured in iso-inertial mode, and employing two different velocities in the eccentric actions; 100% with respect to concentric speed (experimental group 1; EX1), or 150% with respect to concentric speed (experimental group 2; EX2) (participantes were required to perform each concentric action at their own maximal speed; eccentric resistance is provided by the electric-motor device in base of the concentric speed, imitating a iso-inercial device). The third training group used a conventional flywheel device (experimental group 3; FW). Each training session consisted of 4 sets of 7 maximal concentric repetitions performed 2 times per week. Thigh muscle mass, unilateral maximal dynamic strength (1 repetition maximum; 1RM), bilateral and unilateral vertical jump performance, and unilateral muscle power at different percentages of 1RM were assessed approximately 1 week before and after the training period. Training protocols and tests were carried out by Sports Scientist and a Doctor.
Sponsors
University of León
Study design
Allocation
Randomised controlled trial
Intervention model
Parallel
Primary purpose
Treatment
Masking
Open (masking not used)
Eligibility
Sex/Gender
Male
Age
18 Years to 28 Years
Healthy volunteers
Yes
Inclusion criteria
Men between 18 and 28 years Moderately active healthy individuals. Engaged in 6–8 h of recreational physical activity per week. Without history of regular lower limb strength training and no previous muscle joint or bone injury for the last 6 months.
Exclusion criteria
Muscle joint or bone injury for the last 6 months. Chronic pathologie. Less than 6 hours of physical active per week. Athletes.
Outcome results
None listed