Day #2 Heart rate study a VO2 max test – max
A couple of days ago, I did the second part of the heart rate study which involved running as hard as I could on a treadmill as the incline increased every minute. When we tried the treadmill test last week we were plagued by a nose clips that kept sliding off. Rachel was able to locate a nose clip that kayakers use when doing the eskimo rolls. With the new nose clip the test started and we were starting to get some good data until I started to profusely sweat. Bingo, off goes the nose clip! By this point in the test my legs were still fresh and I was feeling energetic and could have run for another 15 minutes and was keen to see how high I could boost my VO2 max value. Rachel has a couple of minutes of quality data which is what she needed for the research so she pulled the experiment. Oh, crap! So, I know what my VO2 value was somewhere in the high 50s but much lower than my past tests. After the treadmill session I had to wear the heart monitor for another 24 hours. The goal of the research was to compare my pre- and post-test heart rate responses.
One of the fun parts of the test is that I ran on the latest and greatest of treadmills. Rather than running on a continous belt I ran on a Woodway ELG treadmill which has 87 rubber slats which rotate sort of like a caterpillar track. The slats have a nice spring and mimics running on a rubber floor.
Heart rate study — Day #1 Again
This morning I headed over to uOttawa to redo my heart rate research study. A bit of background the research study is looking at “the evaluation of continuous HRV during 24 hour periods and during staged exercise testing.” While at the university they attached five heart rate sensor patches to my chest which are smaller and more comfortable than the ones they used last week. Rachel was happy with the first-24-hours worth of data collected before the VO2 test fiasco. As I was heading back to the office they promised me that they had found a new nose clip which won’t slide off during the VO2 running test tomorrow. We’ll have to see what happens. In anticipation of the test, I gave my legs a couple of days rest from running.
On another note, I had one of my best swing dance nights on Friday. I danced with a record number of followers and for some reason followers wanted to dance with me. There was only one bummer and that is, I didn’t drink my diet coke before the dance. This made dancing a little hard as I really had to concentrate and focus on the music, and my footwork. Corona and I discovered a new form of dancing which we are called “fan dancing.” Ottawa Swing Dance Society recently changed it dance location to a church hall which doesn’t have air conditioning. I usually dance in shorts and a short-sleeve shirt. While Corona and I were dancing I steered her so that we were dancing in front of the fan. This made dancing in the hot church more bareable. For the rest of the night, I would steer my follower over to the fan so we could have a “fan dance.” I think they appreciated the breeze from the fan.
Day #2 Heart study
This morning I headed over to uOttawa for the second part of the heart rate study, the VO2 test on a treadmill. After doing a warmup on the treadmill and then some stretching, it was time for the fun to begin. There are a couple of ways to conduct the test, one ways is to incrementally speed up the treadmill until you can no longer run as fast as the treadmill is spinning and the second, is to keep the treadmill spinning at a constant rate and gradually increase the grade angle. For this test they opted for later and it simulates hill climbing. The test started off well as the angle of the treadmill was adjusted every minute but then something bad happened. I started to sweat and nose clip started to slide off. When the clip was on we were starting to get a VO2 value in the low 50s with the expectation that my final VO2 would be in the mid 60s which is similar what I had done a couple of years ago. The researcher decide because the results were coming out so inconsistent to pull the test. I was having a good time and as I was getting into the “groove”/”zone” and my legs still felt fresh.
The plan is to re-do the research early next week and with the hope that they can locate a non-defective nose clip.
Day #1 of the heart research
Today is the first day of the uOttawa heart rate research project. I went in early and they attached five EKG pads to my chest that connect to a recording box ( Holter Monitor) which will record an electrocardiogram of my heart for 48 hours. An ECG for a normal heart look like this with the typical PQRST pattern of the heart wave.
I did a bit of quick math and they will have 172,800 data point at the end of research. They gave me replacement pads to user after taking a shower. Once the research is over I am hoping to post a graph of my daily hourly average heart rate. It is currently a mystery to me what it might look like. I know it will be very low when sleeping but during the day it is anybodies guess as to what my daily average heart is. Before I left the lab they did a check and were surprised that my resting heart rate is 50 beats per minute. This suggests that I’m in relatively good fitness. Rachel, a MSc student, is hoping to use the data to help doctors better prescribe exercise programs to weight-challenged individuals semi-fit and fit patients.
Tomorrow we have more fun as I get to jump on a treadmill and run as fast as I can before sliding off the back of the treadmill. In the tests I’ve done in the past they have a student at the end the treadmill to catch you from flying off and hitting the wall.
Research Study
Earlier this week, I participated in a research study comparing the blood glucose levels of non-diabetic athletes with diabetic athletes during an exercise trial. I’m not diabetic so I was part of the control group. There were two part to the study. The first part involved cycling in a 35C/95F calorimeter to determine what wattage/resistance they should apply to the pedals during the main trial. The second part involved be wired up with a multitude of sensors.
- Four sweat capsules attached to my arms and legs to measure my sweat rate
- A heart rate monitor to measure my heart rate
- A laser sensor on my wrist to measure the maximal blood flow and oxygen level through my skin
- An oxygen mask connected to a long hose connected to a metabolic cart measuring my oxygen, carbon dioxide, breathing rate
- Three internal thermometer measure my body core temperature — ear (tympanic), throat (esophageal) and anonymous place
- A blood glucose monitor. I had to take three blood samples during the trial
Once I was all wired up I headed into the calorimeter (35C/95F) and remained stationary for 30 minutes. The purpose of this segment was to let my body adapt to the warm conditions and to get some baseline measurements. The main part of the experiment involved cycling for 60 minutes at a fixed cadence and with fixed resistance. The final segment was sitting for an hour chilling. Apparently, all the data collected was of value as the researcher was eagerly analyzing it as I left. The idea was to compare all of the data from my session with a diabetic athlete having similar characteristics who also did the same trial to see how s/he responded to the stress of the exercise.
IAT – Implicit Association Test
While exploring iTunes U recently I downloaded a couple of psychology lectures from the University of Washington. During one the lectures they talked about the a href=”http://en.wikipedia.org/wiki/Implicit_Association_Test”IAT (Implicit Association Test/a). These are self-administered tests that will help you find out your unconscious levels of prejudice about age, gender, race, self-esteem, and mathematics vs. art. (Wikipedia Entry) At the a href=”https://implicit.harvard.edu/implicit/”Harvard IAT web site /ayou can take a variety of IATs. I took one comparing Canada and the United States and one comparing Obama and McCain. It was interesting learning about my natural biases.
Research finished. Hooray!
A couple of entries ago I talked about the research study that I was taking part in at UOttawa. The project was to analyze the thermal stress that a miner would experience during the course of a normal day. As the mines get deeper and deeper in the ground the conditions get hotter and hotter. The research involved three exercise sessions at 25C/77F, 30C/86F and 40C/104F. In all cases the humidity was at 20% so sweat would evaporate. Each session had three parts, the setup, the exercise and the unpacking. All of the exercise sessions were done on a a href=”http://en.wikipedia.org/wiki/Recumbent_bicycle”recumbent bicycle/a in a a href=”http://en.wikipedia.org/wiki/Calorimeter”calorimeter /awhich is a highly climate controlled environment. Getting ready for each session took about 20 minutes. I had four skin temperature sensors on my back and legs. Internally, I had a a href=”http://en.wikipedia.org/wiki/Tympanic_cavity”tympanic /a(ear), esophageal (nose/throat) and a third one somewhere else. On my back I had a sweat capsule that would measure my sweat rate. Around my chest I had a heart monitor strap and a blood pressure cuff on my arm. On my other arm I had a blood flow sensor that would measure blood flow by shining a laser beam into one of my blood vessels. Finally, I wore a mask that would monitor my breathing rate, oxygen-carbon dioxide ratio and bunch of other breathing measures. One I was all connected up I would spend an hour in the chamber doing nothing. It was a good time to catch up on babble. I would take blood pressure and heart rate measures every 15 minutes. At the end of the hour I would cycle for 90 minutes at a low resistance. The resistance would simulate the energy expenditure that a miner would experience during an average work day. At the end of the cycle, I would take heart rate and blood pressures measurement every five minutes for 30 minutes. Once the cycling was over I would sit for an hour and play babble again. The final part was doing a maximal blood flow measure. The theory is that as you sweat your body reduces blood flow to the core and sends more blood to the skin for heat radiation and sweating/evaporation. The blood flow meter would track the blood flow rate over the course of the 3.5 hours. The final part was unhooking and removing all the sensors at the end of the session. In the sessions at 25C and 30C I was exothermic as I was heating up the chamber by cycling. When cycling at 40C I was endothermic as the chamber was heating me up as it was a couple of degrees warmer than my body temperature. In all the sessions my heart rate and blood pressure were slightly elevated and the only time I sweated was when cycling at 40C. I had initially that that working out at 40C would be a challenge but under a low humidity was quite pleasant. The researcher will be sending me a summary of the results in a couple of days so I will post the findings.
Geocaching adventure…
Yesterday, I did my first research session in 30C/86F conditions. The training sessions are four hours long and once outfitted you feel like a test pilot as you have a variety of sensors inside and outside your body, all measuring how you are reacting to the heat. In a future post, I will describe in detail what happened and will happen at my two sessions next week. The next sessions will be at 95F and 104F. It is fun training in the heat but the only bummer is that you don’t get a tan.br /br /While span class=”blsp-spelling-error” id=”SPELLING_ERROR_0″geocaching/span yesterday, I made a data entry error that put me on the wrong side of the Ottawa River, on the north, Quebec side. When I got to the apparent cache site all I could see is a large patch of poison ivy. Would a span class=”blsp-spelling-error” id=”SPELLING_ERROR_1″geocacher/span put a cache in the middle of a patch of poison ivy. I double checked my coordinates and had entered 24 rather than 23. The correct coordinates put me back on the south, Ontario, side of the Ottawa River. The cache was a little nasty as they had magnetically attached the first span class=”blsp-spelling-error” id=”SPELLING_ERROR_2″waypoint/span inside a metal culvert leading underneath a sidewalk. You had to reach elbow deep inside the pipe to fetch the metal span class=”blsp-spelling-corrected” id=”SPELLING_ERROR_3″canister/span to get the next set of coordinates. The final cache was hidden inside an old willow tree that was apparently surrounded by poison ivy but I think that the folks at the cache before me didn’t know what PI looks like. While leaving the cache I spotted a red fox which was cool. It looked like a span class=”blsp-spelling-corrected” id=”SPELLING_ERROR_4″super sized/span cat and was on the prowl for dinner.
VO2 test – cycling
Later this week we will start the formal part of the research. Today, we did a VO2 max test on bicycle to gauge my physical fitness. They were pleased last week by my low resting heart rate (42). The setup for test is, you wear a heart rate monitor on your chest, have a nose clips on your nose and breath through a tube hocked up to a machine providing air that analysis your oxygen to carbon dioxide concentration. It also measure things like the number of breaths per minute and a boat load of other measures. Once you are hooked up to the gear you start cycling for two minutes at a certain resistance (measured in watts) and then they increase the resistance by 40 watts. Each stage is two minutes long and the resistance is raised by 40 watts. The starting resistance was 40 watts. I was able to hold on for six stages before I shut down. My calfs and quads were burning by this point. The researchers decided to stop it as I was ready to go to the next stage. In the end, I have a VO2 rating of 50 which is a little lower than my running VO2 which means that I am in good shape.
Research July 2007 – 1
A little while back I heard through a friend that the span class=”blsp-spelling-error” id=”SPELLING_ERROR_0″UOttawa/span Human Kinetics department was seeking fit individuals for research projects. I have participated in two research projects in the past and so was eager to do another one. The research project involves measuring a person’s body-thermal response when working in hotter and hotter conditions. The formal part of the research involves cycling for a fixed period of time under progressive hotter conditions while hooked up to a variety of internal and external measuring devices. Today, I was suppose to do a a href=”http://home.hia.no/~stephens/vo2max.htm”span class=”blsp-spelling-error” id=”SPELLING_ERROR_1″VO/span2 test/a but postponed it a couple of days to allow my legs to recover from the hiking. Instead, we measured my height, weight, blood pressure (normal), heart rate (low) and got wet. The getting wet part is cool as I had done this a couple of times, it is not what you think. The goal was to figure out what was my percent body fat. There are a couple of way of measuring body fat. The most common and least accurate is using a href=”http://en.wikipedia.org/wiki/Body_fat_percentage#Skinfold_Methods”skin fold method/a. The technique which gives a better estimate is known as a href=”http://en.wikipedia.org/wiki/Body_fat_percentage#Body_Average_Density_Measurement”hydrostatic weighting/a. The gold standard is something called the a href=”http://en.wikipedia.org/wiki/Dual_energy_X-ray_absorptiometry”span class=”blsp-spelling-error” id=”SPELLING_ERROR_2″DEXA/span scan/a. In the past, I have done all three tests. For the current project, we did the hydrostatic weighting which involves getting into a tank of water and sweeping the bubbles off your body. The next part is to sit on a platform under water and blow out all the air from your lungs. You sit on the platform for a couple of seconds and they measure your in-the-water weight. We did a couple of hydrostatic measuring sessions until we got similar results. Early next week, we will do the span class=”blsp-spelling-error” id=”SPELLING_ERROR_3″VO/span2 test on a bicycle and then later in the week, we will do the first test session. Each test sessions will be under hotter conditions. Most of the protocols that we will use are things I have done in the past so much of it is span class=”blsp-spelling-corrected” id=”SPELLING_ERROR_4″familiar/span which is great. In future entries, I’ll describe what happens at various sessions.
