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- Newsgroups: misc.fitness
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- From: harry@cv.hp.com (Harry Phinney)
- Subject: Re: Building Muscle
- Message-ID: <1992Dec30.203102.11647@hpcvusn.cv.hp.com>
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- References: <1992Dec30.150210.6247@cbnewsk.cb.att.com>
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- Date: Wed, 30 Dec 1992 20:31:02 GMT
- Lines: 62
-
- krw@cbnewsk.cb.att.com (keith.r.smith) writes:
- : I respectfully submit that 24 rep sets are not going to bring you anywhere
- : near aerobic failure except in cases of doing large-muscle exercises such
- : as deadlifts, squats, or power cleans and other work on that order.
-
- I'll go a bit further. Regardless of the exercise, 24 reps isn't going
- to be "aerobic" if "aerobic" is defined as relying on the aerobic
- metabolisms for the majority of the energy used in the exercise. The
- aerobic metabolisms can only be the major contributors if the exercise
- lasts for more than several minutes without pause. For shorter efforts
- the anaerobic metabolisms (both ATP/CP and lactic carbohydrate) can
- provide much more power than the aerobic mechanisms.
-
- : I would also use the example of bicycle racers. Be they big or small, they
- : all have "hellified" thighs. I wonder how many "reps" a racing cyclist does
- : in a typical road workout.
-
- For a 4-hour ride, figure around 90rpm*240min ~= 20,000
-
- : I also wonder how many "reps" he/she does when
- : scaling a tough hill.
-
- Let's see, maybe 70rpm*5min ~= 350.
-
- : Mind you, these folx must stay below the anaerobic
- : threshold during a workout (or a race, for that matter), because if the legs
- : pump up, the legs will quit.
-
- I have to doubt you've ever ridden in a massed start bicycle race. A
- bicycle racer has to be prepared to go well beyond AT in order to
- maintain contact with the group. Staying below one's AT does no good if
- you lose the draft of the bunch. The top portion of virtually every
- climb is done at a pace beyond AT, and not infrequently beyond VO2max.
-
- : The aerobic threshold kicks in when the
- : heart/lungs can no longer keep up with the work that the muscles are trying
- : to do.
-
- It is not clear that the heart or lungs by themselves define the AT.
- The limiting factors for AT and for VO2max are the subject of quite a
- bit of current research. A theory I like is that each stage of O2
- transport and utilization - lungs, blood chemistry for both affinity and
- disassociation with O2, capillaries and transport to the cells, and
- metabolisms within the cells - are analogous to resistors in series.
- Improving any one element improves the total throughput much like
- reducing one resistor in a chain.
-
- : One does not come anywhere near this in upper body work unless they
- : are doing well-over-50-rep sets.
-
- I'm not sure I've followed the arguments well enough to know whether I
- agree or disagree with this:-) One is not likely to tax the aerobic
- metabolisms significantly unless doing truly hellish numbers of reps.
- Very short sets (up to ~10 seconds) rely on the ATP/CP (aka alactic
- anaerobic) mechanism. Longer sets will rely most heavily on the lactic
- anaerobic carbohydrate metabolism which can produce much more power than
- the aerobic metabolisms. This is why your muscles start to burn. The
- aerobic metabolisms will not significantly contribute unless each set
- lasts several minutes. I know of nobody who does or recommends
- resistance training involving 10 minute+ sets.
-
- Harry Phinney harry@hp-pcd.cv.hp.com
-