Sunday 30 June 2013

The Stretch Shortening Cycle

The Stretch Shortening Cycle (SSC), also known as the myotatic reflex, is the process of muscle stretching directly followed by shortening of the muscle. These rapidly occurring contractions create an enhancement of the elastic characteristics of the muscles equating to a more forceful concentric contraction. The elastic characteristics of muscles are similar to that of a rubber band, what happens when you stretch a rubber band and let it go? The band rapidly snaps back, returning to its original shape. This process potentially improves power production, enhances momentum and minimises workloads during performance.

When a rubber band is held stretched, it loosens, losing shape and the reflex characteristics are minimised. This is similar to slow contractions of muscle, held stretched; they lose their stored energy, therefore diminishing power production. As a result an emphasis is placed upon speed of movement within power based movements.

An example of the stretch shortening cycle can be seen within the examples below, note the rapid activation of the muscles creating momentum:




Power clean

References

  • Hume, Keogh and Reid. The Role of Biomechanics in Maximising Distance and Accuracy of Golf Shot. Sports Medicine, 2005, Volume 35, Issue 5, Pages 429-449.
  • Laaksonen M.S, Kivela R, Kyrolainen H, Sipila S, Selanne H, Lautamaki R, Nuutila P, Knuuti J, Kalliokoski K.K and Kom P.V. Effects of Exhaustive Stretch-Shortening Cycle Exercise on Muscle Blood Flow During Exercise. Acta Physiologica, April 2006, Volume 186, Issue 4, Pages 261-271.
Thanks,
Mitch

Tennis Serve Analysis: Andy Roddick

The following video is a comparative serve analysis of Andy Roddick and other world class tennis players. The video examines the physiological characteristics required to streamline performance.





The key points of the video include:
  • Shoulder range of motion (external rotation ≥ 50°, Roddick = 130°) is of great importance, allowing larger generation of racquet speed.
  • Sequential activation of the muscle groups allows for efficient transfer of momentum resulting in enhanced racquet speed and maximal ball displacement.
  • Of importance is hip drive/rotation, a component of all mechanical throwing and hitting actions. Limited hip drive and rotation observes a noticeable decrease in performance due to the break in the kinetic chain.
Ignoring the product placement... and utilising this movement knowledge, we can then implement corrective techniques and sports specific programming to enhance these skills ultimately improving sports performance. Some examples could include PNF stretching to increase or maintain shoulder range of motion and a one armed low to high cable press accentuating leg drive and hip rotation.

Roddick has one of the fastest ever recorded serves because of highly efficient biomechanics, as evident in this video.





Thanks,
Mitch

Surfing and Strength and Conditioning

Over the last few years the Australian Sports Commission has increased support for Surfing Australia. As a result the emphasis on sports specific conditioning within surfing has improved with the help of world renowned strength and conditioning coach, Jeremy Sheppard.





The video below highlights:
  • The physiological demands placed upon surfers such as powerful production of movements and enhanced load absorption experienced in aerial manoeuvres and efficiency in paddling.
  • How to effectively train for practice and competition and the importance of prioritisation. Note the emphasis on plyometrics and power lifting which will aid in power production and application of amortisation.





These highlighted features of surfing are of focus within Innovate Sports Specific Conditioning. Our programs are all individualised, catering to each athletes requirements in order to improve the performance of our athletes.


Thanks,
Mitch

Ground Reaction Force

A Ground Reaction Force (GRF) is a force produced by the ground of equal and opposite direction to a force created by a body in contact with the ground. Various sporting events utilise this force to maintain and improve specific movements, by powerfully pushing an extremity into the ground an equally powerful reaction force is emitted. An example of this can be seen within a basketball dunk, the player loads their legs and forcefully push into the ground, this results in a GRF which ripples through the body, launching them into the air. The greater the leg push, the greater the GRF.






Michael Jordan vs Dominique Wilkins: Dunk Contest


References:


  • Hume, Keogh and Reid. The Role of Biomechanics in Maximising Distance and Accuracy of Golf Shot. Sports Medicine, 2005, Volume 35, Issue 5, Pages 429-449.
Thanks,
Mitch

Tuesday 25 June 2013

Review: Barefoot, Minimalist and Forefoot Running

In recent times there has been an increase in the popularity of barefoot or minimalist running amongst running communities. The common running shoe encourages a heel strike running style, it is specifically designed to slow the loading rates of the impact forces that occur during heel strike. Barefoot running has been used as a training method for years partially due to the belief that it improves performance and strengthens the intrinsic and extrinsic muscles of the foot.




Numerous studies have cited the following biomechanical effects in regards to barefoot, minimalist and forefoot running:
  • Decreased angles of the ankle resulting in a transition to a mid or forefoot strike, lessening heel strike frequency
  • Minimal ground contact time and loading forces when compared with shod running
  • A significantly lower stride length when running barefoot
  • Forefoot strike and barefoot running conditions have shown to reduce the absorption efficiency of the knees during running and increasing the power absorption demands upon the ankle
  • Strengthening of muscles and ligaments surround the foot and ankle


These results show that the increases in power absorption of the ankle may have injurious consequences of the foot and ankle including Achilles tendonitis and metatarsalgia. However, other sources debate metatarsalgia risk suggesting the limited impact transient during forefoot striking shows lower loading rates upon the metatarsals.




Care should be undertaken when adopting barefoot, minimalist or forefoot running styles in attempts to improve or reduce the stresses imposed during conventional heel strike running. Comparative studies and professionals alike suggest a slow and safe integration of barefoot, minimalist and forefoot running, suggesting softer surfaces initially and alternating barefoot and shod running to decrease the chances of injury.

References:
  • Calabro A. Foot Strike Patterns Study Ignites Barefoot Running Debate.
  • Utz-Maegher C, Nolty J and Holt L. Comparative Analysis of Barefoot and Shod Running.
  • Williams III D.S.B, Green D.H and Wurzinger B. Changes in Lower Extremity Movement and Power Absorption During Forefoot Striking and Barefoot Running
Thanks,
Mitch

Why Does An Athlete Need Strength & Conditioning?

Strength and conditioning (S&C) is a field that has come a long way in the last 10-20 years. The original perception of what a S&C coach did was simply based around making an athlete stronger for his sport and hopefully this also meant he had less injuries whilst playing. The current realm of what a S&C coach does is vast, where you will now find numerous professionals all over Australia with post graduate and even PHD qualifications in the field of S&C.

Science has been caught up and S&C is now a mix of somewhere between statistician / physiologist / coach / manager & mentor / biomechanist / scientist / therapist. The understanding of athlete requirements is now very well understood in the training environment, and S&C coaches can offer an array of skills to bring to the table for athlete development.

The following areas offer some insight of where a S&C coach can have an impact on an athlete’s long term development.

Planning & Management

A S&C coach is the master in planning what training and combinations of different types of training an athlete is capable of and should be doing at any single point in time and on a regular basis. A S&C coach uses statistical methods of measuring how much load / strain / monotony of training / volume is placed on an athlete’s body at any one time and prescribes an exact amount and type of training across all areas of development (skills / recovery / strength / recovery / etc). The S&C coach is often the individual responsible for managing all coaches and support staff to provide the best long term athletic plan for the athlete.     

Testing & Exercise Prescription

The S&C coach goes to great length to initially identify where an athlete has strengths and weaknesses, and maps out a plan of attack for the overall development for an athlete. The S&C coach has the ability to test an athlete in a range of ways involving postural screening / orthopedic assessment methods / load bearing ability / functional movement discrepancy / functional flexibility / sports specific stability / repetition maximum testing / body-weight ratio strength / functional movement awareness / motor skill function / activation patterning. With this information the S&C coach will prescribe an effective training program to the athlete, which initially matches their individual requirements and later meld this with the physical requirements of their chosen sport. An important note to add is that the S&C coach is aware of the rate and type of progression that is suitable for the athlete based on their age, training experience, maturity, injury status, current skill level, training volume, and functional capacity to perform the training program.

Functional Movements

When testing and prescribing exercises, a long-term fallacy is that a S&C coach writes a program to make the “muscles” stronger. This philosophy of training has long been replaced with the theory that “strength, power, flexibility, endurance, coordination, and speed” is about making the movements NOT muscles more effective, and that is how a S&C coach will prescribe exercise. For example ‘vertical jumping ability’ is a very important skill for a volleyball or basketball athlete, where the S&C coach will initially assess what part of the jumping or squatting movement has room for functional improvement, and instead of prescribing isolated strengthening exercises for the individual muscles, the muscles and tissues are considered to work as a system. Numerous muscles around numerous joints coordinate to function together to produce a reactive, flexible, fast, force producing movement, so prescription might be to perform a squatting pattern exercise like a jump squat or power clean, instead of a leg extension. If there are areas in the movement that are not efficient; tension in hip flexor muscles, tight hamstrings, or inactive gluteals, exercises and stretches for those functional discrepancies can also be prescribed for.     




What Does a S&C Program Involve?

Unbeknownst to most athletes you don’t have to train with heavy weights and lifting platforms to improve your functional ability. Many exercise programs I prescribe are to athletes where they can perform 90% of their program on their bedroom or hotel room floor! Many athletes have discrepancies where simple individually specific stretches can work wonders done with very minimal equipment, in a matter of a few minutes a day. The option is there to have a full sport specific functional program performing numerous times a week in a high performance centre, however certainly not a necessity.







The S&C coach is a vital part of any athlete’s program, where I have had the privilege to work with athletes as young as 8 and as old as 85, from a local club to world class standard improve their skills, in sports ranging from trampolining to lawn bowls to triathlon to tennis. Every athlete can benefit from an individual and sports specific functional assessment, and following this a tailored sports specific exercise prescription.

Cheers,
Anthony

Rock Climbing: Climber's Pump

Climbers get pumped! More specifically our forearms get rock hard and useless really quick. From a physiological point of view, what's going on?

When muscles are required to produce force, they fill with blood so that oxygen and nutrients can be delivered to them to produce movement (gripping). When this occurs over time, a muscle swells with blood (climber’s pump), however when it is working at a high rate over time it becomes fatigued, where excess lactic acid accumulates in the muscle and limits the muscles ability to contract and produce force at a consistent intense rate.




What can we do to reduce the pump, whilst on a climb?

Lactic acid is the by-product of intense work, which is like the bodies automatic internal alarm system to slow down. Lactic acid accumulates in the muscle tissue and limits the ability for a muscle to continually produce force at a high rate.

Like any endurance trained athlete, an advanced climber through long term experience will have a greater ability to work with a higher amount of lactic acid for longer, and also have the ability to remove and metabolize (breakdown) lactic acid at a faster rate.

The ability of a climber to use the body efficiently – with the upper body working in unison with the lower body will decrease the build up of a “forearm pump”. Using the leg muscles / movements efficiently to transfer load to the upper body when climbing will dramatically decrease the onset of a pump. Limiting continual strong gripping actions will also decrease the lactic acid build up and decrease the severity of a “pump”. Taking small rest breaks and limiting the amount of continual gripping will help to delay the effects of a “pump”. 

How can we train in the gym to stave off the pump out on the rock?

Like any athlete, a rock climber initially requires a sports specific functional assessment to determine how their individual body moves, and a postural screening to determine their movement tension patterns. With this information an individually prescribed exercise program will balance their body mechanics and provide appropriate functional movement patterns. These movement patterns will aid when climbing to effectively transfer load through the limbs to conserve energy, and minimize excessive upper body hanging and pulling positions. There isn’t really one miracle exercise to drastically decrease a “pump”; a holistic approach is the best long term.




Are there any nutritional tips or super foods for lessening the pump?

There is no properly proven nutritional method for lessening the “pump”, or lactic acid accumulation that you can consume in the short term for an event, or individual climbing session. A long term diet that is poor in vitamins / nutrients / carbohydrate / protein will definitely decrease a climber’s ability to endure on the wall, where fatigue will set in earlier than desired because the body is not fuelled properly. Long term endurance athletes, which is the athlete category that climber’s fit into, require an exceptionally good nutritional intake, to be sufficiently recovered from previous climbs, and to prepare the body for the next climb.
In general it is a good idea to top up your energy levels within half an hour before an extended climbing session with a fast absorbing carbohydrate snack. If energy levels are low the body fatigues quicker and the effects of fatigue will decrease performance.  
Hydration is also a major consideration before and during climbing. Even a small decrease in hydration levels can have a major impact on climbing performance. Small sips of water or sports drink before and during climbing training will assist in maintaining appropriate hydration levels.

Any tips for warm-up, cool down and rest period between sessions that will help reduce getting pumped?

Warm up and cool down are very important in getting the most out of each climb. Initially the climber’s body must be prepared for tackling a wall and there are a few stand out areas of focus for a warm up for the whole body including the forearms:
  • Decrease areas of tension, and balance postural mechanics in the body by completing individually specific stretches.
  • Then activate the right muscles ready for a climb; areas specific to climbers are the gluteals, quadriceps, and thoracic extensors particularly.
  • Specific areas of warm up and preparation for prevention of a “pump” are wrist flexors, which can be stretched. A climber can also use basic massage techniques on themselves to decrease tension in the forearms and wrists, prior to climbing which can cause a “pump” to occur a little earlier. Over time using these techniques of stretching and massaging will make a large difference to the onset of a “pump”.
During a climb as mentioned earlier the best way to prevent a “pump” is to limit the amount and degree of gripping actions, and maximize the use of the lower body with the upper body, a combination of improved technique, weight transferral, and strong body mechanics.

On completion of a climb, like any other athlete the climber will recover most effectively if they have an individually specific warm down routine. Body mechanics are individual and particular stretching and releasing techniques may not suit every climber. A combination of individual stretches and release techniques, icing and compression strategies, and nutrition and hydration will provide the optimal recovery to climb again soon.




Rest periods are essential for climbers. Rest must be sufficient enough to allow the body to recover effectively. The forearms are a major area of tension, due to the time they spend under working load. A beginner climber should leave a break between their climbing days (example: climbing Monday / Wednesday / Friday) to give the tension areas time to recover. An advanced climber may be able to climb up to multiple times per day, however they will have superior body mechanics decreasing the tension on their forearms during a climb, and will have a between-session strategy in place which is well practiced to allow for fast recovery.

Cheers,
Anthony

Motocross Sport Specific Conditioning

Hi Everyone,

Motocross is an awesome sport where the rider has to have a huge power to weight ratio. This allows efficient control of the bike and improves their ability to quickly shift their body weight around the bike.




In this relatively simple exercise progression, it is easy to see how sports specific exercises can improve a rider’s movements to improve sports performance.


Cheers,
Anthony

Triathlon Sport Specific Training

Hi Everyone,

Check out this link on performance training for triathlon.





It emphasises the use of unilateral stabilisation then progressing into “POWER”, which a lot of endurance athletes lack. The exercises are all body weight resistance, where there is minimal equipment required to complete a high intense sports specific workout.

Thanks,
Anthony