簡單介紹~pump - 有氧運動 Aerobics

Body Pump: Is it really the world's fastest way to get in shape?



Body Pump is a group exercise class using barbells with adjustable
weights. It works the major muscle groups via a series of exercises
including squats, presses and lifts.

Designed to "tone and condition muscles while raising metabolic rate
for rapid fat-burning," Body Pump is supposed to be proven to be "the world's
fastest way to get in shape."

Does such proof exist? Well, if it does, I couldn't find it. According
to a journalist who recently contacted me about the program, "there are
thousands of studies for Body Pump." I was able to find three, only one
of which has been published.

The study, carried in the Journal of Strength and Conditioning Research
and done at the University of Texas at Austin, looked at the calorie-burning
effects of a 50-minute Body Pump workout.

A group of 15 men and 15 women took part. Each subject completed five
Body Pump sessions prior to the test itself so they could learn how to
correctly perform the workout and decide how much weight to use in each
exercise.

The participants used a weight that caused muscular fatigue (defined as
a feeling of working "somewhat hard" to "hard" while still executing the
movements correctly). Trainers watched each workout to make sure that the
movements were performed exactly as demonstrated on the video.

Five men and five women were chosen to perform the Body Pump workout a
second time using identical weights, just so the researchers could double
check that the results were accurate.

Subjects burned, on average, 265 calories during the workout. The men
burned a little more calories (315) compared to the women (214). On average,
they performed the Body Pump workout at 29.1% of their VO2peak and 63% of
their maximum heart rate.

Gender Heart rate (% max) Total calories
Females 60% 214
Males 66% 315
Total 63% 265

A second trial, carried out at the University of Auckland, compared
a Body Pump session lasting 57 minutes (including the warm-up and cool-down
periods) with 60 minutes of continuous cycling.

The group (10 men and women) burned an average of 411 calories during
the Body Pump session, and 483 and 339 when separated into men and women.

So, why did subjects in the Auckland study burn more calories?

Firstly, the workout lasted longer (57 versus 50 minutes). The intensity
level was also higher. Subjects in the Texas study burned an average of 5.3 c
alories per minute. In the Auckland study, they burned 7 calories per minute
for the group, and 8 and 6 calories per minute for the men and women,
respectively.

However, it's worth pointing out that there were just 10 subjects in the
Auckland trial, compared to 30 in the Texas study. The more subjects that
take part in a study, the more confident we can be that the results apply to
a broader population.

In addition, the Auckland study doesn't specify how many men and women
took part. Why does this matter? Recall that the men burned more calories
than the women did (483 versus 339). If there were more men in the study,
the average calorie expenditure for the group as a whole would appear larger.

In the cycling session, subjects burned an average of 623 calories when
expressed as a group and 706 and 540 when separated into males and females.
This equates to approximately 10, 12 and 9 calories per minute for the group,
males and females, respectively. The results are summarized in the table below.

Gender Body Pump Cycle
Oxygen consumption (ml/kg/min) 20 29
Average percentage of VO2 max 41% 60%
Average heart rate 135 bpm 134 bpm
Average % of maximum heart rate 74% 73%

The cycle session also consumed a greater proportion of fat than the
Body Pump session (27% compared to 17%). However, it's the number of calories
burned rather than the source of those calories that determines the rate of
weight loss (see Fat and how to burn more of it in the Members-Only Area for
more information).

What about after the workout? Isn't weight training better than cycling
at raising your metabolic rate after exercise?

Unfortunately, there's no reliable research that's looked at the effect
of Body Pump on post-exercise metabolism. Although weight-training does boost
your metabolic rate after the workout ends, the research I've seen shows that
multiple sets of compound exercises using a relatively heavy weight (causing
muscular failure at around 10 repetitions) has the greatest effect (see How
to fight fat and win in the Members-Only Area for more information).

What about the extra muscle? Even though cycling might burn more calories
during the workout itself, the muscle that Body Pump builds will increase your
metabolic rate so you burn more calories during the day, right?

Beginners, or anyone returning to exercise after a lay-off, may gain a
little muscle. However, Body Pump involves the use of light weights and high
repetitions. This type of workout will increase muscular endurance rather
than add a significant amount of muscle.

"It is unlikely that strength gains and hypertrophy would occur for
already fit subjects such as those who participated in the present study,"
write the Auckland research team. "However, for individuals without a history
of resistance training Body Pump may provide sufficient stimulus to elicit
strength gains."

What's more, despite the popular belief that one pound of muscle burns
"50-100 calories per day," there's very little evidence to show that this is
true. More accurate estimates suggest that losing two pounds of fat and
replacing it with two pounds of muscle will increase your resting metabolic
rate by just eight calories per day (see What they told you about muscle and
metabolism is wrong).

The Auckland research team also point out that Body Pump provides a low
to moderate stimulus to increase aerobic fitness.

"The implication of these results is that Body Pump is useful for
maintaining aerobic fitness, but does not provide sufficient stimulus to
improve aerobic fitness in already fit subjects such as those who participated
in this study."


The bottom line
These limitations aside, Body Pump has been shown to help you lose fat.
In a 13-week trial comparing Body Pump, Body Step, Body Attack, Body Combat,
and RPM, subjects in the Body Pump group actually lost the most fat. Beginners,
or anyone returning to exercise after a lay-off, may gain a little muscle and
improve their cardiovascular fitness.

Body Pump is also very popular with anyone who prefers to exercise with
other people rather than on their own. When I used to teach aerobics, there
were many people who (no matter how many times I told them about the benefits
of resistance training) wouldn't set foot in a gym for love nor money simply
because they found it so boring.

So, while it's a long way from being the world's fastest way to get in
shape, Body Pump does provide some of the benefits of conventional gym-based
resistance-training programs.





Reference
Stanforth, D., Stanforth, P.R., & Hoemeke, M.P. (2000).
Physiologic and metabolic responses to a body pump workout.
Journal of Strength and Conditioning Research, 14, 144-150





http://www.thefactsaboutfitness.com/research/bodypump.htm





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