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weightlifting- benefits of single set against multiple sets
A recent
study has shed new light on weight training techniques and has given a
boost to time-conscious recreational
weightlifters just the boost they need to stay with their exercise
program. Resistance training (including weightlifting) is a popular
and recommended form of exercise for increasing strength, improving
overall health and decreasing risk of musculoskeletal injury. Other health benefits include delaying the onset of frailty associated
with aging. Resistance training involves lifting or moving a weight
a certain number of times (repetitions, or reps) and should involve
the major muscles of the legs, chest, back, shoulders, abdomen, and
arms. Repetitions are frequently combined into sets, and multiple
sets of repetitions have traditionally been used for weight training
recommendations. Although ACSM and the United States Surgeon General
recommend a single set of eight to 12 repetitions three or more
times a week for general health/fitness, single-set reps have been
generally thought of as for beginners only.
This study
asked if increasing the volume of weight training with multiple sets
would result in greater improvements in muscular strength, muscular
endurance and body composition among long-term experienced adult
recreational weight lifters. To this end, the researchers designed a
protocol to compare the effects of one set of a nine-exercise
circuit with those of three sets of the same circuit.
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Most importantly, the results show that single-set regimens remain an
effective option for improving muscular fitness in long-term
recreational weightlifters. This is important for those who desire
the muscular fitness benefits associated with a well rounded
physical fitness program but may not have the time to devote to
multiple set programs.
The researchers were quick to point out that they were measuring only
three factors that improve with strength training. Such other
factors as disease-resistance, bone mass, and improvements in
metabolism, all of which have been reported as positive results from
resistance training, were not addressed. "Weight training should be
an important component of any fitness regimen," said Hass.
"Obviously the resistance training program should be tailored to
meet each individual's goals, but a healthy lifestyle doesn't have
to be dependent on a rigid high volume regimen. Our subjects showed
enough improvement that the everyday exerciser should be
encouraged."
The team of researchers, led by Christopher J. Hass, of the University of
Florida, recruited volunteers from a local fitness center,
stipulating that they be healthy recreational weightlifters with at
least a year's experience. "We knew that exercise enthusiasts often
drop out of their weightlifting program because it takes too much
time," said Hass. "We wanted to focus on one aspect of a training
regimen, and see if recreational weightlifters could get the same or
similar conditioning results in a shorter time period."
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Forty-nine
healthy men and women between the ages of 20 and 50 years, all of
whom had been performing a one-set training regimen for at least one
year, were selected for the study. They were asked to maintain their
current level of physical activity (recreational and cardiovascular)
for the duration of the study, and were assigned to one of two
training groups. Both groups did the same nine exercises: leg
extension, leg curl, pullover, arm cross, chest press, lateral
raise, overhead press, biceps curl, and triceps extension; one set
or three sets of eight to 12 reps to momentary muscular exhaustion.
After 13 weeks, the investigators measured changes in muscle
strength and endurance as well as key measures of body composition
in both groups.
Forty-two of the 49 subjects completed the study (including 30 women); the seven
who were unable to continue for one reason or another were all from
the three-set group. The results of this study supported the idea
that both approaches to weight training were effective in improving
muscular strength and endurance. Both groups improved in all
measures taken over the 13-week period. Of note, the persons in the
group assigned to do the multiple-set regimen tended to improve an
average two percent more than the group assigned to the single-set
regimen, but both groups showed similar improvements in body
composition measures. This includes a reduction in per cent body fat
and an increase in lean body mass.
The data collected supported the hypothesis that both groups would experience
substantial and similar improvements in muscle strength and
endurance, and body composition, and that additional sets do not
significantly improve those measurements, at least not within the 13
weeks covered by this study. Although not statistically different,
there was a tendency for the multiple-set group to have greater
improvements in muscle endurance, lending support to a dose-response
effect of weight training.
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