EquipmentAbout the equipment I've use, I'm using, I'll use ... or not !
Thursday, September 29 2011
By Julien on Thursday, September 29 2011, 21:37
But I digress. This replacement was a big mistake!
First of all, the bite valve is of appalling quality. It was chewed off after two runs only (OK, the cumulative distance of these two runs was about 280km, but still). On top of that, the older one had a better flow.
And one of the reason I had to bite it hard(er) is that they added their "new" push-pull valve between the bite valve and the pipe. They claim it's to avoid leakage. But if the bite valve was well designed in the first place you wouldn't need this extra valve! Guys, it's simple, the clue is in the name: "bite valve". You bite, the water flows. You release, the water stops. Hence it's a valve... Otherwise it would just be called a "bite"! So essentially the only reason for adding this extra valve is to allow them in fine to reduce the quality of the original bite valve. And indeed, the new bite valve leaks whereas the previous one didn't. So Decathlon product designers, you might as well remove the bite valve now, since it's pretty much useless. Luckily I kept the older one and used it as a replacement.
And last but not least, the new pipe might be slightly lighter, but it also pinches rather easily when forced to take a "sharp" bend. And the only way to solve that is to remove the bladder, put it back, shake the bag, change the pipe side for good measure, and hope for the best. How long until they come up with a kind of extra sleeve to support the pipe along the bending areas, yet another "innovation" designed to fix a problem that didn't exist in the first place?
To come back to their "replace your old hydration pack!", well just don't. Really. The old one was far better.
Wednesday, June 1 2011
By Julien on Wednesday, June 1 2011, 15:51
The MSR SweetWater Purifier works in four stages:
- Stainless steel prefilter to avoid clogging by larger particles
- Silica depth microfilter against protozoa and bacteria
- Activated carbon against chemicals (and foul taste)
- Sodium Hypochlorite (ie. bleach) against viruses (and any filter-dodging bacteria)
MSR SweetWater Purifier
As you can see from the picture, it is more fiddly than the all-in-one bottles. At 400g, it is significantly heavier too. The water is pumped mechanically through the prefilter and the intake hose, then passes through the main microfilter/carbon and gets out into another hose which can be connected to a container. Sodium Hypochlorite is added later, with a 5 minutes dwell time. If there wasn't a need for chemical addition, I would definitely try to hook up permanently the output hose onto a hydration bladder. In this case, I wouldn't even need to take off the bag to pump water in. But how can I easily add the bleach? I was thinking to use a syringe/needle, but all that gets very fiddly. Suggestions welcome!
As for the speed, I managed to filter tab water at 1.5L/min, but it'll be slower with more turbid water. After bleaching, the water didn't taste much of chlorine, which is definitely a big bonus.
Monday, March 1 2010
By Julien on Monday, March 1 2010, 14:55
- New Balance M1062 for the road and hard paths (next: Vienna Marathon)
- Salomon XA Pro 3D Ultra for the easy trails (next: Cambridge Boundary Run)
- Inov8 Flyroc for the mud, technical trails and off-path (next: Hardmoors55)
- Vibram Five Fingers for the fun
Ultra Salomon XA Pro 3D
Thursday, January 28 2010
By Julien on Thursday, January 28 2010, 17:14
Monday, September 7 2009
By Julien on Monday, September 7 2009, 12:18
Trial 6: Canoeing
On Saturday I went canoeing on the Wey River around Farncombe, Surrey (between Guildford and Godalming). I think this is one of the activity at which the VFF perform very well. They've got enough grip to handle wet surfaces and obviously you're not afraid to get them wet. Which means that you feel more free to mess around, jumping from one boat to another or to trees, walk in the water, climb ropes hanging around, ... Nothing to do with barefooting and gait correction, but comfortable and very good fun!
Trial 7: Climbing on sandstone
On Sunday I went climbing at Harrison's Rocks. I originally brought the VFF for approach walks as they're well suited for trail walking and are very light, which means less burden when clipped on the harness during climbing. But at some point I decided to try them on relatively easy routes. Because of their weak arch support (to say the least), they're not suited for edging and as discussed earlier, their grip is not worth my climbing shoes'. On sandstone however, where the grip is poor anyway and smearing is fundamental, they are actually usable for easy-ish warm up routes. Because they're more flexible (and comfortable) than conventional climbing shoes, they sometimes allow to push into the rock with a more optimal angle, counter-balancing their weaker grip.
Ultra thin soles 3
Monday, May 18 2009
By Julien on Monday, May 18 2009, 16:19
Trial 4: hill walking
First I went for a stroll on the coast near Eastbourne. As I started to get used to the concrete, the section in town was not so much of an issue any more. Good to have friends walking a couple of meters behind as well to collect the reactions and comments from people in the streets. Some said they were cool :) . The grassy rolling hills rendered a good sensation. The grip was decent enough to climb trees. I didn't hesitate to walk a bit in the sea, which would be less tempting with conventional shoes. Round pebbles are fine, but sharp ones are not very comfortable to step on. Therefore I'm not sure I'm ready for rocky mountains with them. Last but not least I got sunburned on the top of my foot...
Trial 5: indoor climbing
Then I went climbing indoor at Craggy Island. I obviously didn't expect anything from the Five Fingers on routes with tiny footholds, as my big toes would have to support my whole weight. So I tried a couple of easy routes on which smearing (ie. pushing into the wall instead of relying on footholds) might have been useful. Again, the general feeling was good, you can sense very well the shape of the foot holds. But the grip is really poor compared to my climbing shoes soles made by... Vibram. You really have to push orthogonally the wall when you smear, slipping otherwise.
More opportunistic tests in part 3.
Ultra thin soles 2
Wednesday, April 29 2009
By Julien on Wednesday, April 29 2009, 14:18
I've been attracted by them for several reasons, so many that I actually feel like I've been naively caught into excessive consumerism by some clever marketing teams :)
- Novelty factor and the satisfaction to try something singularly different.
- Sensations, following the idea I've developed in "The tortoise and the hare" about seeing every single meter of ground between London and Brighton, I hope to additionally be able to "feel" every meter of ground. It is not clear yet whether I'll be able to run long distances with them or not, but the principle applies to shorter runs too. Gaining extra feeling on the feet will hopefully contributes to this idea in two ways. On a physical level, I hope they will provide an extra source of sensation, just as the Inov8 Flyrock were surprisingly a lot of fun to run with on slightly adverse terrain (sand, mud, snow, ...). On a more psychological level, they might help with the "connection with the Earth" type of feeling.
- Injury prevention: there is increasing evidence that modern, massively cushioned running shoes are not necessarily better than their cheaper counterparts, with studies showing that people running in expensive shoes are more that twice as likely to get injured. Cushioning gives the human body the impression that it can land heavily, which inevitably alters the walking/running style way. Whether this is problematic or not is still up for debate amongst sport scientists. Beside, several studies have shown that induced stress on the bones triggers bone growth, which will later delay osteporosis. Now, where is the limit between beneficial stress and harmful shocks is not clear. But after all, the human body was originally designed to walk and run barefoot.
Trial 1: shopping at the local supermarket
The first thing I noticed when I went out was that I could very easily tell apart the different kinds of concrete and asphalt I was walking on, which is rather nice. The second thing is that the impact on the heel and on the metatarsals feels fairly hard compared to using typically cushioned shoes. And the third thing is that you don't walk unnoticed - lots of people literally scrutinised them. Some people say they look silly. That said, millions of people have bought the Crocs which look ugly even to my underdeveloped sense of fashion. Personally, I think the Five Fingers look rather funny.
Trial 2: commuting walk
I then decided to walk 5km in them to see how they feel on longer distances. Again, the heel contact is rather hard, unless you try to land mid-foot or even on the toes. However, I couldn't sustain that for very long as I not only looked like I was training for a catwalk, but it's also fairly hard to balance on landing. Towards the end, I started to get blisters under my heels, which is fairly unexpected. Furthermore, I took a couple minutes longer than my usual commuting time, which can be impeded on the shorter stride required to reduce the ground reaction force during the initial heel contact. Walking a bit on the grass in Hyde Park felt so much better than the concrete. I guess humans were designed before the roads.
Trial 3: short run in the park
I then went for a 6.3km short run in the park. At first it felt pretty good, as it's much easier to land mid-foot or on the toes while running than walking. Soon, I managed to bounce on my arches, with my heel barely touching the ground, as if my feet were mounted on springs. That led to a great feeling, just like I was moving effortlessly. The concrete felt rather hard, the grass was nice, and the sand (for the horses) was great. Little by little, though, I started to feel the tiredness in my arches, and when I eventually stopped I thought my calves would seize up - they didn't.
The outcome of these preliminary tests is rather positive, but I don't think I will suddenly change completely my habits and drop all my other shoes for this new pair. I will just gradually replace some (short) training sessions or commuting walks. That should help to strengthen some muscles of the lower legs and feet. And that will diversify even more my running and walking habits, which in my opinion is the best way to prevent injuries. Indeed, variety in running session characteristics such as distance, speed and surface reduces the risk of injuries.
Further tests are to come: hill walking, trail running and maybe climbing, open water swimming and canoeing. I guess they might be more suitable for these activities that do not take place on concrete, although it's hard to guess what their grip will be on wet/muddy terrain.
> Tests continue in part 2 and part 3.
Ultra thin soles
PS: Note that the brand name "Vibram" has nothing to do with anti-vibration insoles as I've heard sometimes. It's derived from the company founder's name, Vitale Bramani.
Thursday, July 10 2008
By Julien on Thursday, July 10 2008, 17:56
Monday, April 28 2008
By Julien on Monday, April 28 2008, 14:45
In the quest to tune my bike into a more efficient, triathlon-like machine, I've therefore tried to adapt profile bars. I finally gave up with the Oval A710 previously installed, as they were too uncomfortable for my arms. I recently replaced them with the Profile Jammer GT, apparently more suitable for long rides. They're higher and feel better in the arms. But I don't really have a good feeling with them: it feels like my lower back is supporting most of my upper body weight (when my forearms should help) and I can't drive as much power from my legs.
Ultra aerodynamic decision to make.
Sunday, February 17 2008
By Julien on Sunday, February 17 2008, 18:57
Ultra sexy suit.
Friday, January 18 2008
By Julien on Friday, January 18 2008, 17:21
It consists of 3 main elements:
- An ECG belt to get the heart rate through comfy textile electrodes.
- A foot pod, measuring stride length and cadence, based on inertial sensors (accelerometer and maybe gyroscope).
- The watch gathering wirelessly the information from the two above and connecting to a PC.
To test the limits of the Polar, I tried it walking instead of running, and it behaved very well, as I got a very similar error: 1.6% above. I guess I just need to calibrate it once to get near-perfect distance/speed estimation at any pace. I finally performed an ultimate test on the sensor: I ran on a treadmill :) . This tricked the sensor. Indeed, your actual speed is null, whereas your feet are moving. It displayed a 13km/h running speed when the treadmill was set on 15km/h (13.6% off).
You can use their software (PolarProTrainer) to upload your data, view the training calendar, running curves (speed, heart rate, cadence, altitude, ...), evaluate your training efficiency, and even program some exercices to be sent back to the watch. It seems to have loads of functionalities, but the look and feel is not great.
Some Adidas shoes have a placeholder for the sensor (just like the Nike for the iPod one). Better: some Adidas shirts have embeded ECG electrodes for a truly wearable sensing.
On the whole, the iPod+Nike is just a fashion gadget based on the Apple hype, whereas the Polar system (with or without Adidas) is really designed for training. And I swear I'm not paid to write that!
Ultra running sensor.
Monday, September 24 2007
By Julien on Monday, September 24 2007, 11:52
Following a fall due to the pedals, I also had to change the rear derailleur hanger.
Ultra minor bike changes.
Wednesday, June 27 2007
By Julien on Wednesday, June 27 2007, 19:35
On races such as the UTMB (r), mobile phones will be out of coverage. Therefore satellite phones seem to be the key. Most of them include a GPS as well (*), and embed a decent operating system. I was thinking to buy a cheap second hand satellite phone for that purpose, but they don't seem so cheap :-/ Even more expensive on ebay than through regular retailers... The other issue is to write the application that will get the GPS position every 15 minutes and send it though the satellite link via SMS or HTTP, the latter being easier if available. In order to use all the specific functionalities of the phone, a SDK is probably necessary. I've not found any for Thuraya phones for example.
Can anyone help me with one of these two points: where to find a cheap satellite phone and how to develop on it ?
(*) this is not as obvious as it may seem, as satellite phones and GPS devices use different kinds of satellites and technologies.
Thursday, April 19 2007
By Julien on Thursday, April 19 2007, 11:42
Wednesday, November 29 2006
By Julien on Wednesday, November 29 2006, 15:59
I then confidently ran 2 loops in Hyde Park. The distance is about 6.3km, measured on several maps, with several tools (ruler, curvimeter) and on GoogleEarth by several persons:
After my run, the iPod displayed (*):
Hmmm, it reads 8.53km, when I expected ... 12.66km (2*6.33) ! That's an amazing 33% error ! One of my colleague faced a similar error. Even more worrying: some also reported a wrong recorded time. Of course, I didn't calibrated it and I didn't use the Nike shoes. But well ... that's just as good as a good old mechanical podometer. I guess they don't do anything more clever than counting the steps. I believe that with a Walkman, a podometer, a watch and a couple of transistors something more functional could have been designed 20 years ago ...
Our aficionados must be very naive (or well paid) to be "very thankful that Nike and Apple made it possible to use it with alternative running shoes" ... Not only you have to buy the gadget anyway, but as it's not very convenient to wear, you'll probably buy some compatible Nike shoes next time.
Ultra Christmas gadget.
(*) yes, date is not set properly
EDIT (18/01/2008): this is actually not an accelerometer, but a simple contact sensor. Therefore it can only count your steps - this is a basic podometer... See Sparkfun for example.
Monday, November 20 2006
By Julien on Monday, November 20 2006, 11:42
Decathlon Sport 2
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