Our view from where we were painting |
Tuesday, November 12, 2024
We Did Bag Painting
Thursday, May 9, 2024
When Is An Ideal Time To Exercise?
ST 080524 |
I was surprised to read that one of those interviewed commented that more observations and studies are still required to confirm the findings that suggest that we are at our best in the late afternoon or early evening.
You can search if you like. There are more than sufficient evidence supporting circadian rhythms and physical performances peaking in the late afternoon or early evening. For most people, this is between 4-7 pm.
Sports fans will know that NBA Finals, Champions League matches etc are all played in the late evenings. Almost all track and field world records are set in the evening as well.
Evidence may show that the best time of the day to exercise is the late afternoon to early evening. However, that time may not suit everyone. Better to exercise at whatever time suits you best as some exercise is better than no exercise, especially in Singapore when the weather is warm year round.
The article is published in yesterday's Straits Times. Front page of the Life section. Better still, read our blog, you will get updates quicker.
Reference
Aoyama S and Shibata S (2020). Time of Day Dependent Physiological Responses To Meal And Exercise. Frontiers Nutr. DOI: 10.3389/fnut.2020.00018
Saturday, March 9, 2024
Is Your Sports Bra Restricting Your Breathing?
Kipp and colleagues (2024) studied whether tight sports bras hinder breathing in runners. They had 9 international and/ or national competitive runners complete a series of treadmill tests while wearing a specially modified version of LuluLemon's Energy sports bra. The underband tightness around the RC can be increased or decreased with extra eye-and-hook attachments at the back.
The bra was also modified so that a small balloon catheter could be inserted into the underband to measure exactly how much pressure was being exerted as the runners breathed in and out.
In addition, the subjects had another balloon catheter inserted through their nose down into their esophagus to measure the internal pressures exerted with each breath by their lungs as they ran! Ouch. Check out the Instagram video Kipp posted here. Definitely worth a watch so you can appreciate what the subjects had to endure for this research.
That catheter allowed the researchers to calculate the "work of breathing" i.e. the energy used by the respiratory muscles to inflate and deflate the lungs. It has been calculated that it takes more than 10 percent of your total energy output during hard exercise.
The runs were done under 3 conditions. Once with the runners' self selected bra size, once with the bra tightened and once with it loosened.
When the pressure on the band was tight, it was on average 16 % greater than in the loose condition. Going from self selected to tight did not change anything. However going from self selected to loose reduced oxygen (and energy) consumption. Overall difference between tight and loose conditions was between 1-2 percent in most subjects, with an average of 1.3 percent. 8 out of the 9 runners saw improvements in the loose condition. Not the 4 % change like what you get from the carbon plated super running shoes, but significant enough.
Kipp estimated that a 2 % change in oxygen consumption translates to a 3 minute improvement in the marathon time for a 3-hr marathoner runner.
The reason for the efficiency difference is due to the tighter bra making the runners breathe differently. While running at VO2 max in the tight bra, the women had to breathe in more oxygen overall by breathing more quickly (57 versus 52 breaths per min). However they had to breathe more shallowly.
That work of breathing took 16 percent more energy, which explains why overall whole body consumption was higher. Secondary effects include the oxygen rich blood being diverted away from the legs to elsewhere.
It can be a serious problem if you wear your bra too tightly if you value a percent or two in performance. Kipp cited previous data suggesting that 70 % of women choose sports bras that are too small for them compared to a professional fit. If you're happy with your sports bra, you can ignore these findings.
The runners presumably chose a tighter than optimal bra because they wanted adequate support. However none of the women in the study reported that the loose condition was uncomfortable or provided inadequate support.
A possible reason is that women select and try on sports bras at rest. None of the breathing parameters meaured in Kipp's study were affected at rest. It was only during hard exercise when the runners were breathing hard and inflating their lungs that problems emerged.
It may be best to choose your sports bra based on how it feels during a hard workout rather how it felt at the store. Sports bra designs are much more than just tight the underband is. All the elite runners in this study had small to medium breasts. It also depends on the activity you are doing.
There are more than enough models and patents amongst different brands for women to choose between insufficient support and excessive tightness. Pick what you need.
If your sports bra feels tight enough when you are exercising that you wonder if it may interfere with your breathing then it probably is.
Reference
Kipp S, Leahy MG and Sheel AW et al (2024). Sports Bra Restriction On Respiratory Mechanics During Exercise. Med Sci Sp Ex. DOI: 10.1249/MSS.0000000000003403
Sunday, February 18, 2024
Burnout When You Specialize Early In Sports
ST 180224 |
She was quoted in a New York Times article saying "I feel lucky that I could enjoy swimming," and "people need to relax ... and take a step back and realize that you don't have to be great at this young age. It's not about immediate results". Ledecky said she recalled she had not raced in events longer than 25 yards (22.9 metres) until she was eight years old.
Wednesday, January 24, 2024
To Stretch Or Not To Stretch Before Exercise
The author cited 2 recent reviews but ddid not include the references so there was no way to verify the research.
What we have written before is just one static stretch of 30 seconds can reduce your maximum strength. You're more likely to get injured if you do static stretching before exercising.
Good static flexibility also does not help prevent injuries. This topic has been the studied widely, a few studies have found that there are some benefits, while a few other studies have found that being too flexible is associated with injury. Most do not seem to make much difference.
Static flexibility is not associated with non sports related problems like low back pain.
We have written on this since 2009. Was hoping this is common knowledge.
So take note that static flexibility is not that important, unless your specific sport requires it. Stretching before, during or after a workout does not prevent subsequent muscle soreness. It does not reduce inury risk either (Herbert et al, 2011).
The goal of warming up is to physically warm your muscles to make them more pliable as well as get your heart rate up to be ready to deliver oxygen to your working muscles.
If you run, you can ride a stationary bike for 10 minutes or just run the first kilometer real slow before picking up the pace. If you're playing badminton or tennis, I'll suggest some lunges, side to side movements, i.e. sport specific movements that you may use while playing.
Reference
Herbert RD, Noronha MD and Kamoer SJ (2011). Stretching To Prevent Or Reduce Muscle Soreness After Exercise. Cochrane Reviews. DOI: 10.1002/14651858.CD004577.pub3
Here's the article from today's paper. probably don't have to read it Our blog articles on stretching are much better.
Thursday, October 26, 2023
Team Building Event
MJ's cats |
Riz made this for his wife Stacy |
Wednesday, September 27, 2023
An Article About Fascia
There are many skeptics and naysayers still, but more research and knowledge is definitely emerging. It's in the Life section of today's Straits Times on page C3.