By Jasmine Wing
If you have a short attention span and prefer an ‘in and out’
approach when it comes to your workout, then high intensity training may be
perfect for you. However, besides the masses of great benefits, it also has its
shortfalls.
When participating in moderate-extreme exercise, your body somewhat
panics. It has a survival mechanism, which I am sure you are familiar with called fight or flight. This means your body
releases cortisol and adrenaline that supplies your body with energy and
strength to either fight off the enemy or run away from adversary. Either way
your body, when FORCED, will find the energy from the back burner to avoid
danger.
…the benefits;
·
Afterburn:
One great benefit to this type of workout is called the
‘afterburn’. Research suggests that you will have a much greater afterburn effect
when you do 5 rounds of 30 second sprints than if you were to jog for 30
minutes. This all sounds great right? Cortisol that is released when training
intensely aids the metabolism of fat in the body and increases your resting
metabolic rate. This means your ‘fat burning machine’ is working faster than it
usually would.
“When
your body is pushed during exercise, it can take up to three days for your
metabolism to return to ‘normal’,” says Victor Zammit, professor of metabolic
biochemistry at Warwick University.
·
For a healthier
heart:
Interestingly after either a HEAVY lifting session or HIGH
INTENSITY workout, your body requires more oxygen afterwards to recover. This
improves your cardiorespiratory endurance (heart and respiratory system). It also helps your heart to become stronger by
promoting faster cardiac output. Both workouts help to activate your fast
twitch muscle fibres, which cause muscle growth and weight loss.
·
Quick and
simple:
High-intensity interval training can be really beneficial
for those with limited time such as lunch breaks or morning sessions before
work. Ticking all the boxes for convenience and are successful at increasing
fitness, rapid weight loss and muscle building. What’s not to love?
·
Supress
that hungry feeling:
For some, the bonuses of sprints, circuits and so on, far
outweigh the bad. For example the fact that HITs supress your appetite can be
very appealing for those of us trying to lose weight. If your drawback is that
insatiable appetite then look no further, research has shown that HIIT reduces
appetite unlike those hour long spin classes that leave you feeling starving. A
study in Western Australia showed that those who performed high intensity
exercise consumed fewer calories. They were simply less hungry after doing
HITT. This is because it reduces the amount of hunger hormone, ghrelin.
…the downside;
·
Or is it
just a myth?
On the contrary, many believe that the after burn idea is
just a myth and real weight loss can simply be achieved when your energy
expenditure is greater than your energy intake. Unlike in financial terms,
weight loss is merely achieved when your outgoings (calories burnt) are higher
than you ingoings’ (your food).
·
Feel the
burn:
As part of your body’s response to stress, inflammation is
reduced by suppressing the immune system. Then when you relax and your stress
hormone levels normalise, the pain will come on strong! This can be dangerous, if
you are someone who likes to hit the gym hard until you feel the ‘burn’, with a
‘no pain-no gain’, attitude then you are at risk of overdoing it. You may go a
lot harder because you don’t feel anything in the moment. Let me assure you,
from personal experience, the day after you may be feeling a bit regretful.
·
Tiring
stuff:
When carrying out HIT’s it important to know that interval
training can be really tough on your body. If you perform high intensity
training too often and consecutively without allowing your body enough time to
recovery and the correct diet then you will most certainly feel drained and at
are risk of overtraining. One snag is although fast twitch muscle fibres
produce better burst of speed, they also tire more quickly. High intensity
workouts really can cause fatigue - not great for those long days at work or
studying.
·
Correct
form is crucial:
Popularity of box jumps and exercises such as burpees has
been increasing and I am most certainly included in the love, hate relationship
with those intense exercises however if performed without proper technique I am
well aware of their potential danger. They cause damage to joints, hips, knees
and ankles. They also increase the likelihood of injuries. Jumping down from a
box jump causes unwanted strain on joints and muscles. If you are ever unsure
about your form or technique never hesitate to ask a personal trainer, it is
much better to feel a fool for asking than laying on the gym floor tears after
hurting yourself.
·
Warning:
My final point; it is not well advertised but this type of
training it is not something advised for beginners. Sprinting requires the highest
rate of energy supply and demands a lot from your body. So don’t go throwing
yourself into something too hard, too quickly!
