Disqus - Latest Comments for Ze_Apelido

Re: Why there are more walk-away moms

Zé — Mon, 06 May 2013 11:08:28 -0000

This article is terrible. It's premise is admittedly based on anecdotal data. Then it tries to hint that men aren't doing their fare share - # of stay-at-home fathers is on the rise (RATE of increase), but women still do the majority of housework (ABSOLUTE value) overall. That doesn't say jack___, since women are still more likely to stay at home than men, they are more likely to do more of the housework (ON AVERAGE).

Logic fail.

Re: What’s the Steepest Gradient for a Road Bike?

Zé — Fri, 15 Mar 2013 16:26:52 -0000

Power output is not a limitation. You arbitrarily selected 2 m/s as the velocity, obviously that can and will have to be reduced going up steeper slopes. You should control by fixing the VAR across different gradients.

A more interesting question is, when does it become more efficient to get off the bike and hike up than ride?

Re: Ohio Officials: Election Official May Have Voted Six Times - By Eliana Johnson - The Corner - National Review Online

Zé — Tue, 19 Feb 2013 22:11:57 -0000

This person should be arrested.

So should officials who attempt to suppress voter turnout via intimidation or law.

Consistency is king.

Re: The Science of Sport: The low-carb, high fat diet debate and deviant thinking

Zé — Sun, 17 Feb 2013 18:45:25 -0000

You can't say it of course, but Noakes has jumped the shark. Anyone who has reasonably read up on the scientific literature for obesity / weight regulation and macronutrient content can't agree with Noakes' extremist statements on effects of fat / carb intake. Perhaps he and others will be shown right in the future, but certainly the current evidence is not pointing that way.

P.S. Have you read the Volek & Phinney book on improving endurance performance with a low-carb diet? Another book based on poor rationale and ONE study done 30 years ago by Phinney himself. What a joke!

Re: The Science of Sport: The Tour in the mountains: Analysis & discussion

Zé — Mon, 09 Jul 2012 22:56:10 -0000

Hi Ross, just wanted to comment on the apparent VO2 max / efficiency relationship. It is interesting that there is any correlation, but do you actually think that there is some causal relationship? You mentioned in a previous post postulating how it could be like a car power / efficiency tradeoff. I'm not so sure. VO2max in almost all athletes I believe is limited by the amount of oxygen the heart can pump, and given sufficient exercise adaptation will be equal in value different movements (i.e. cycling or running). Efficiency is the related to gross biomechanics and localized muscular efficiency of producing force / work per input of ATP, and conversion of oxygen into ATP. I suppose its possible that there's some genetic trade-off between the two, but I can't think of any explainable reason otherwise. Thoughts?

Re: Vertical Impact Loading Rate in Running: Post #2 from Jay Dicharry of the UVA Speed Lab

Zé — Wed, 15 Feb 2012 16:42:20 -0000

what Nigg is saying is that the magnitude of the impact forces dissipate as they move up the body, and that their magnitude is much smaller relative to the joint forces produced due to muscle contraction. not that I necessarily agree with him

Re: Google 2015: what will it look like?

Zé — Wed, 01 Jun 2011 00:32:19 -0000

google has had social networking for a while. it's called "orkut"

Re: The Science of Sport: Edinburgh: The final 3 minutes

Zé — Mon, 30 May 2011 18:51:43 -0000

awesome!!!

Re: Rescue Crews Bring Injured Hiker To Safety In Palm Springs - Local News Story - KESQ Palm Springs

Zé — Thu, 12 May 2011 17:34:22 -0000

better bring your desalination units!

Re: Before sugar, we were talking about cholesterol

Zé — Tue, 19 Apr 2011 21:19:42 -0000

And no one is saying that is some sort of good diet to follow. You can get good results a variety of ways

Re: Before sugar, we were talking about cholesterol

Zé — Mon, 18 Apr 2011 14:39:02 -0000

Twinkie diet also improved cholesterol levels. http://www.cnn.com/2010/HEA...

Re: The Science of Sport: The Central Governor and the Athlete's Clock: Pacing and performance

Zé — Tue, 05 Apr 2011 23:28:22 -0000

Sorry for the late response (back from Colombia...I wonder how cocaine alters the central governor!).

I think your heat example is a good one. One thing I'm not sure of is exactly what EMG activity indicates - I think it shows the action potential after the neuromuscular junction (which may alter the signal) - but that may be moot with your additional example of the external electrical stimulation differences.

I think I understand your disagreement with using the word "limiting"...but let's look at the point at which people stop in the heat example (40 degrees C). What would happen to the body during exercise at 41 degrees C? Does anyone know, or has it never been measured? (either for ethical or practical reasons). If someone has measured the performance of the various physiological systems during exercise at 41 degree C, then they could determine what exactly would be harmed in that state. But without that evaluation, we wouldn't know if exercise with 41 C body temp could be sustained. Which would leave open the possibility that it could be sustained but the central governor is "limiting" performance. The CNS is a regulator if 41 C is very dangerous, but a limiter if it is not. Is that known?

Thanks

Re: The Science of Sport: The Central Governor and the Athlete's Clock: Pacing and performance

Zé — Fri, 18 Mar 2011 08:44:50 -0000

Also, on pacing, I think there is some interesting modeling that can be done to illustrate what the most effective pacing strategies would be, and help explain why athletes may speed up slightly at the end of a race. It would have to do with the nonlinear effects of over/under estimating your proper pace on glycogen depletion and other factors...

Re: The Science of Sport: The Central Governor and the Athlete's Clock: Pacing and performance

Zé — Fri, 18 Mar 2011 08:40:01 -0000

Hi Ross,

Fellow sports science phd / semi researcher here. Just wondering if you've ever studied physiological control systems. In most systems, there are multiple layers of control, including feedback and feedforward components.

These layers include 'local' feedback, as well as 'global' or central feedback (like the 'central governor'). I don't think anyone could argue against the existence or one or the other. Their relative importance in the overall scheme could be highly complex, and evolve with time, and in some cases sufficient feedback may be caused by the local feedback mechanism, and others by the global mechanism.

An example in biomechanics, look at muscle force production. Yes, muscles rarely are "shredded", but that alone does not indicate the importance of the central control. Indeed, there are a number of local feedback mechanisms in play. For instance, as muscle velocity increases, force production rapidly decreases. As a muscle nears the end of its range of motion, force production also decreases. Also, the golgi tendon and muscle spindles feedback information directly to alter muscle activation level. These all happen and prevent high force production in extreme situations. So muscles are likely not "shredded" much due to local feedback mechanisms.

In addition, the brain also sends muscle activation signals, which are in part due to information from the senors mentioned above.

So I think the central governor theory is interesting...the aspect that it exists is pretty obvious (as it exists for many things), but the main debate to me is its role in limitations in maximal performance. And to correctly prove that it is the central governor limiting performance, one must show that the local feedback mechanisms are not.

Good stuff.

Re: The Dose of Intervention and the Land of Dr. Oz

Zé — Fri, 11 Mar 2011 18:55:24 -0000

if you don't address and incorporate potential changes of NEAT between varied macronutrient distributions, your entire argument is invalid

Re: Calories, fat or carbohydrates? Why diets work (when they do).

Zé — Sun, 02 Jan 2011 00:16:20 -0000

Yes there is a need to control variables.

Which includes controlling for thermogenic effect of varying macronutritents and NEAT. It's hard to take any claims of effect of varying macronutrients on weight control unless all variables in the energy balance equation are considered and controlled.

Re: Suggested Hikes

Zé — Tue, 29 Sep 2009 23:50:00 -0000

Outside of ANF:

Verdugo Mountains:

Beaudry Loop
Brand Park Loop
La Tuna Canyon

Griffith Park:

Amir's Garden
Mt Lee (Hollywood Sign)
Batcaves

Santa Monica Mountains:

Eagle Rock from Trippett Ranch
Santa Ynez Falls from Trippett Ranch
Red Rock Canyon

Los Padres:

Santa Paula Canyon (haven't done)
Mt Pinos (haven't done)

In ANF but outside burned area (should be open soon)

Devil's Punchbowl (haven't been, would love to go)
Mt Baldy via Baldy Notch (you should definitely get up to Mt Baldy!)

Re: Progress Report (September 21st)

Zé — Thu, 24 Sep 2009 19:57:30 -0000

keep up the good work! when is your year 'cutoff' date? lemme know if you need any ideas.

Re: Hike 17 – Mt. Hillyer via Horse Flats

Zé — Thu, 24 Sep 2009 19:56:12 -0000

yeah there are plenty of "trails" on the usgs maps that do not exist anymore. trust me many of my cross country explorations were allegedly following a "trail".

2 good things to do: 1) check out the area on google earth / map satellite 2) ask people on the san gabriel mountain forum. tons of good info to get for a future hike there

Re: Hike 28 – Hoegee’s Camp Trail Loop

Zé — Wed, 02 Sep 2009 21:14:31 -0000

hey it's Bob!

Re: Progress Report (August 27th)

Zé — Wed, 02 Sep 2009 21:04:09 -0000

Great job Kolby. Keep them coming!