How much do we need to exercise to improve our
cardiovascular fitness? To gain muscle? To increase flexibility?
Strength Training
Resistance exercise, or strength training, has been shown to
have numerous benefits including lowering the risk of heart disease and risk of
death for any cause, decreases cholesterol, fatigue, and depression as well as
increasing bone density and the body’s response to insulin. The frequency and
intensity of resistance exercise depends on your goals. Someone trying to build
muscle will need more intense training than someone looking to improve athletic
performance or someone else trying to maintain muscle mass as they age.1
In regards to controlling blood sugar in diabetic patients,
both strength training and aerobic training have shown benefits, showing that
any increase in physical activity is important2, and allowing the patient to
choose what type of physical activity may lead to greater participation rates.
A review on literature pertaining to strength training was
done in 2015 to determine the best recommendations for a variety of adults. Several studies found that strength training
performed 3 days a week has far better results than very intense training 1 day
per week and mixed or mildly better results than training 2 days per week in
regards to increasing the maximum weight a test subject was able to lift for 1
repetition of an exercise. This is consistent with most recommendations and
previous studies showing that most people need to allow for 48 hours of rest
between strength training for each muscle group.1 Leave the heavy lifting until
you are more comfortable with strength training. In fact, in regards to
increasing power, lighter loads have been shown to have a greater benefit than
lifting your absolute max weight.1
Overall, recommendations for resistance training are as
follows:
Beginners – Full body training at moderate intensity 2-3
times per week
Advanced (greater than 6 months of strength training) – split
training at high intensity. Each muscle group is worked 2-3 times per week. i.e.
Monday arms and chest, Tuesday legs and abs, Wednesday rest, Thursday arms and
chest, Friday legs and abs, Friday and Saturday rest.
To improve athletic performance and power (higher jumps,
faster sprints) – body weight or low weight exercises such as jump squats, base
jumps, and traveling push-ups).1
Another study shows greater compliance among patients that
exercise at a lower intensity, furthering the recommendation for low intensity
exercise for new strength trainers. In addition, new exercisers tend to choose
the correct intensity during aerobic exercise, they almost always choose too
low an intensity for resistance training.1 Keep this in mind if you
choose to start a training program without the aid of a personal trainer.
Aerobic Exercise
Cardiovascular training, or aerobic exercise, has its own
list of benefits. Benefits range from improving cognitive performance3, decreasing symptoms of
depression and PTSD4, reducing inflammation5, reducing migraine frequency
and severity6, regulating weight, and
cardiovascular benefits7.
Numerous studies show cardiovascular benefits with moderate
activity for 30-60 minutes on most days of the week. This can be brisk walking
(not a leisurely stroll) or jogging, not sprinting at your max speed.8 Within reason, adding
intensity, frequency, and longevity to cardiovascular training will improve the
cardiovascular results.9
Your best bet is to try different types of cardiovascular
exercise to determine what you like that most. Some examples are swimming,
running/jogging/walking, cycling, and rowing. Pick one to focus on and a second
one for cross training to help avoid injury.
Once you have determine what type of cardiovascular training you want to
do, your best bet is to find a rapid pace that you can keep up for 20 minutes. Warm
up at a moderate pace for 5 minutes, work for 20 minutes, then cool down at a
moderate pace for another 5 minutes.
Another popular method for cardiovascular training is the
HIIT method, or high intensity interval training. Using this method, after a warm up,
participants will sprint at their fastest speed for a short period of time,
then recover at a slower pace. For instance, a runner will do a brisk walk or
slow jog for 5 minutes, then sprint as fast as they for 30 seconds and jog
until they are in control of their breath. This person would repeat the
sprint/jog sequence several times, then jog or walk briskly for another 5
minutes to cool down. Despite popular
claims, a study in 2015 showed a greater increase in cardiac and lung capacity
in overweight and obese males when they performed continuous, moderate activity
rather than HIIT Training.10 However, any addition in
physical activity will be beneficial.
Flexibility
Improving flexibility lessens the amount of force placed on your
joints when moving around. A stretching routine can reduce your risk of injury
when exercise, but when done improperly, can actually increase your risk of
injury. Stretching before cardio or resistance training can decrease your performance,
particularly when stretches are held for longer than 60 seconds. Dynamic stretching,
on the other hand, can lead to increased power and strength during athletic
performances.11 These are the stretches you
see professional football players doing on the field prior to a game. I would
not advise dynamic stretching be done without first getting instruction from a
personal trainer.
Static stretching should take place after a work-out, held
just past the point of discomfort, for only 10-30 seconds. Two to three days
per week is sufficient to improve flexibility and reduce your risk of injury.
There’s a lot of information here and it can be
overwhelming. This is why getting help from a personal trainer can be so beneficial. A personal trainer can design a plan for you
as well as make sure that you are performing the recommended exercises safely
and effectively. If you decide to start an exercise program on your own, I
would start slowly and begin focusing on either strength or cardiovascular
training. Start with a gentle warm up,
perform your strength or aerobic exercises, then cool down and stretch. As you
gain confidence and fitness, you can add some running to your strength training
or body weight exercises to your swimming routine. You can increase intensity
and frequency as you go as well. No matter what your starting point, you can
begin a healthy physical activity routine, gain fitness, and improve your
health and quality of life.
1. Resistance
Exercise: How Much Is Enough? : Current Sports Medicine Reports.
http://journals.lww.com/acsm-csmr/fulltext/2015/05000/Resistance_Exercise___How_Much_Is_Enough_.19.aspx.
Accessed July 28, 2017.
2. Resistance
exercise versus aerobic exercise for type 2 diabetes: a systematic review and
meta-analysis. - PubMed - NCBI. https://www.ncbi.nlm.nih.gov/pubmed/24297743.
Accessed July 28, 2017.
3. Dose-Response
of Aerobic Exercise on Cognition: A Community-Based, Pilot Randomized
Controlled Trial. - PubMed - NCBI. https://www.ncbi.nlm.nih.gov/pubmed/26158265.
Accessed July 31, 2017.
4. Exercise
for the treatment of depression and anxiety. - PubMed - NCBI.
https://www.ncbi.nlm.nih.gov/pubmed/21495519. Accessed July 31, 2017.
5. A
standardized randomized 6-month aerobic exercise-training down-regulated
pro-inflammatory genes, but up-regulated anti-inflammatory, neuron survi... -
PubMed - NCBI. https://www.ncbi.nlm.nih.gov/pubmed/25981742. Accessed July 31,
2017.
6. Aerobic
Exercise for Reducing Migraine Burden: Mechanisms, Markers, and Models of
Change Processes. - PubMed - NCBI. https://www.ncbi.nlm.nih.gov/pubmed/26643584.
Accessed July 31, 2017.
7. Edward
F. Adolph Distinguished Lecture: The remarkable anti-aging effects of aerobic
exercise on systemic arteries. - PubMed - NCBI. https://www.ncbi.nlm.nih.gov/pubmed/24855137.
Accessed July 31, 2017.
8. Haennel
R, Lemire F. Physical activity to prevent cardiovascular disease. How much is
enough? | The College of Family Physicians of Canada. http://www.cfp.ca/content/48/1/65.
Accessed July 31, 2017.
9. Carnethon
M. Physical Activity and Cardiovascular Disease: How Much is Enough? Am J
Lifestyle Medicat. 2009;3(1). Accessed July 31, 2017
10. High
Intensity Interval- vs Moderate Intensity- Training for Improving
Cardiometabolic Health in Overweight or Obese Males: A Randomized Controlled...
- PubMed - NCBI. https://www.ncbi.nlm.nih.gov/pubmed/26489022. Accessed July 31,
2017.
11. Basic
Principles Regarding Strength, Flexibility, and Stability Exercises -
ScienceDirect.
http://www.sciencedirect.com.ezproxy.emich.edu/science/article/pii/S1934148212010507?via%3Dihub.
Accessed July 31, 2017.