Sunday, August 30, 2009
VSA Open Water Swim Race
Friday, August 21, 2009
The Athlete's Heart: Syncope--Part 1
Syncope (syn' ko pee) is the medical term used to describe a brief period of loss of consciousness (either partial or complete) that is due to insufficient blood flow to the brain. This process is temporary and followed by spontaneous recovery. Patients often use different terms such as “dizziness”, “light-headedness”, “blacking out”, “passing out”, or “falling out” to describe this problem. This is a common medical condition that affects approximately 3% of the population at some point during life. It is increasingly common as we age, affecting 6% of individuals over the age of 75. It’s not surprising, then, that this is a fairly common problem among athletes.
Types of Syncope
There are many types or causes of syncope and it can be useful to categorize the types as: 1) cardiac (heart-related), 2) non-cardiac, or 3) unknown. This framework helps the physician sort out an individual’s cause among the many possibilities and then provide any needed treatment.
Cardiac syncope
A variety of cardiac disorders can produce syncope, but cardiac causes account for the explanation in only 10% of cases. As patients age, it is more likely that a cardiac cause is responsible for their syncope. Some of the cardiac causes are potentially life-threatening, but most are less serious; all can be treated.
Life-threatening cardiac causes. Acute myocardial infarction (“heart attack”) or aortic dissection (tearing apart of the layers of the aorta) can produce syncope or other changes in the level of consciousness. Both of these conditions are usually accompanied by chest or back pain and can also be associated with shortness of breath. In these situations, syncope is the result of decreased blood pressure and/or decreased blood flow to the brain. Both of these conditions can result in sudden death and affected individuals require urgent medical attention.
Low cardiac output. The last set of cardiac causes are those due to decreased pumping function, or cardiac output, from the heart. Long-standing congestive heart failure (CHF) or leaking (regurgitant) heart valves may lead to a low blood pressure that limits blood flow to the brain.
Non-cardiac syncope
Neurocardiogenic syncope. The most common type of syncope is termed neurocardiogenic, or vasovagal syncope. The term vasovagal conveys the association of “vaso,” for vasodilation of arterial system (leading to a decrease in blood pressure) and “vagal,” for the accompanying slow heart rate (sometimes produced by decreased activity in the vagal nerves). This type of syncope usually occurs in the standing position and is usually preceded by symptoms such as light-headedness, nausea, or sweating.
Situational syncope. A variety of precipitating factors, such as emotional stress, anxiety, pain, cough, urination, or defecation can lead to syncope. In this situation, the resulting syncope is thought to be due to a reflex, sudden decrease in heart rate that produces a transient reduction in blood flow to the brain.
Orthostatic syncope. Syncope can be caused by a sudden drop in the blood pressure as we rise from a sitting to standing position. The medical terms for this situation are orthostasis, or orthostatic hypotension (reduced blood pressure). Ordinarily, the body adjusts to this change in position by increasing the heart rate and increasing motor tone in the blood vessels to keep the blood pressure constant. When these mechanisms fail, the sudden (relative) drop in heart rate and blood pressure may produce syncope. This problem can be made worse by dehydration or medications that reduce the circulating blood volume or by medications that limit the blood pressure response (eg, beta-blockers).
Neurologic syncope. One last, unusual category of causes is termed neurologic. In this situation, the syncope is caused by a sudden decrease in blood flow to the brain in conditions such as stroke, transient ischemic attack (TIA, or “near-stroke”), or seizures. In one variant, syncope is due to a sudden decrease in blood flow to the posterior portion of the brain called the cerebellum. This is often due to pre-existing vascular disease in the vertebral arteries that supply this portion of the brain. Patients with neurologic syncope often experience other neurologic symptoms such as vertigo, visual changes, or muscle movement clumsiness immediately before the syncopal event.
Medical Evaluation
Syncope can sometimes easily be explained by benign problems such as dehydration, but the majority of individuals with syncope should be evaluated carefully for an explanation. Because of the demands on the athlete’s cardiovascular system during exercise, it is particularly important for the athlete with syncope to be evaluated completely.
Next week, we’ll talk about the medical evaluation of patients with syncope and discuss the various treatment options.
Sunday, August 16, 2009
The Athlete's Heart
Saturday, August 15, 2009
Triathlon Overhead
A few weeks ago, I finished up my first 12 months with Justin Daerr as my coach....and I was reflecting on the year. A year ago, we planned to devote 750 hours per year to training, or ~15 hours per week. As it turns out, we spent 655 hours on training....logging 540,000 yards of swimming, 4900 miles of riding, and 780 miles of running. I was sidelined for several weeks last summer and again this January because of running injuries or we might have reached the goal of 750 hours. Along the way, there were 5 triathlons (1 sprint, 3 Olympic, 1 IM), 1 duathlon, 1 tri relay (as the swimmer), 1 long open water swim race, and 1 training camp with Endurance Corner. There were 151 swim workouts, 175 bike workouts, 197 run workouts, 66 strength workouts, and 23 days off. A modest amount of time and training by Ironman standards, I suppose, but that's not what I was thinking about.....
Today, I'm thinking about the overhead....the additional time and energy that were needed to support those 655 hours. By my reckoning, the overhead for this past year included:
Showers. I like to get up and shower even before the first workout of the day, but I won't count this in the overhead....just the showers after the workouts (9x/week @ 10 minutes each = 78 hours/year).
Laundry. I've got a housekeeper to do the regular laundry, but I do all of the workout laundry (9x/week @10 minutes each time = 78 hours/year).
Race trip planning. Won't count any time for the local races....after all, it only takes a moment to fill out the registration form, etc. But the out-of-town trips took some time to plan....Hilton Head (1 hour), Chicago (3 hours), Disney World (twice, 2 hours each), Tucson (2 hours), Maryland (1 hour), Brazil (10 hours)....21 hours total.
Race travel. 80 hours total. The Brazil trip was a long one!
Buying triathlon supplies/equipment online. About 20 minutes each week (17 hours/year).
Buying triathlon supplies/equipment locally. About 10 hours for the new bike and ~17 hours total for everything else.
Bike maintenance/cleaning. About 20 minutes/week (17 hours/year).
Logging the workouts into TrainingPeaks (without technical difficulties....8 minutes per day, or 48 hours/year).
Talking with JD....phone/email/Twitter, etc....10 minutes/week, or 9 hours/year.
Volunteering at a couple triathlons. 3 hours for the local race, 8 hours for IM Florida 2008.
Driving to/from workouts. Jackson is small, so thankfully nothing's too far away. But the pool is a 20-minute drive and the closest of my gyms is an 8-minute drive. Usually ride from home. Conservatively, 1 hour 40 minutes each week, or 86 hours per year.
Tri Club. Not a big time consumer, but a couple meetings and social events, ~8 hours per year.
Reading magazines. Triathlete, Inside Triathlon, Bicycling, Runners World. About 25 minutes per week. Add in some online reading for another 15 minutes per weeek. About 35 hours/year.
Post-race celebration. There's some of this after every race, but I won't add this into the total. We'll say that celebration is just part of life!
And God only knows what I've left out....
So....getting out the calculator....that works out to 329 hours for the past year....or an overhead rate of about 50%. The tables in the triathlon books never seem to take this into account. So the next time you're talking to somebody about the 600 or 700 or 800 hours of training you've planned for the coming year, take a moment to think about the overhead.
At the Endurance Corner Tucson training camp in March, Jeff Shilt offered the advice that success in triathlon was related to one's ability in the area of "crap management." He's right! For the busy working triathlete, perhaps nothing is more important than managing the overhead. Something to keep in mind!Toward more efficient management of triathlon overhead....
Wednesday, August 12, 2009
Thursday, August 6, 2009
Beach Bum Triathlon 2009
I decided to use my moutain bike for the bike leg....and this was the most popular choice. I recall that Michael Lovato did the race (and won) the first time I did this race....and I seem to recall he used a tri bike. I did well on the bike, maintaining my position at about 15th in the race. I passed a couple people and was passed by a couple people. I was pretty happy. It's great to be near the front of the race!
I faded a bit in the run, though, losing 54 positions. In the end, I was 15th out of 45 men who were older than 40. I need to run better!
I've shared this already on Twitter, but this was my favorite bike at the race. Stylish and plenty of room for the athlete's nutritional products!