It’s a great feeling to go to the limit with your body, and it can be done at all levels, from the elite competitive athlete, to the weekend runner training up for a marathon, or the local social athlete just getting back in the game. But an abrupt increase in training intensity or volume often leads to discouraging soft-tissue problems such as tendinopathies, muscle strains and stress fractures.
Throughout Simplex Physiotherapy, we stress that it is important to stay out of the clinic and on the field, which is a big part of the science of precision load management. Numerous sports injuries are thought to be a result of a single clumsy move or unexpected accident. In fact, the majority of musculoskeletal failures are from training loads imposed on structural tissue that are too high (volume, intensity, or frequency).
Understanding how to manage training stress and know how to systematically recover can help you maximise athletic performance and minimise risk of structural failure.
The Acute-to-Chronic Workload Ratio Explained
Sports physiotherapists investigate your workload history to find out why injuries occur during training. Your “chronic workload” is the average number of training sessions that you have completed over the last month that you feel you are fit for, and it is the level of training from which you are starting. The total amount of training you’ve completed in the current week is called the “acute workload.”
Injury spikes tend to happen when you are doing more than what you have done in the past, which is called a training error. For instance, if you increase your running distance by 50% over one week or start to take up high-intensity sprinting without proper preparation, it leads to huge stress on unconditioned tendons and joints. Maintaining this ratio in a safe and progressive range will cause your tissues to thicken and adapt over time to create structural resilience.
Professional Physiotherapy Is A Key Component In Fostering Resilient Athletes
We treat sports performance not just as a localised injury once it’s occurred. We train proactively with active people to develop strong bodies that can withstand high physical demands:
- Comprehensive Biomechanical Screenings: We assess how you move and look for any areas that may have joints which are limited in motion, muscles which are weak, or compensations in your movement that may lead to uneven stress during high speed training.
- Individualised Conditioning and Loading Strategies: Our staff develops a personalised strength and conditioning program tailored into a gradual loading protocol for your muscles, bones and tendons, safely increasing your absolute physical capacity.
- Strategic Recovery and Periodisation Planning: We assist you in creating a well-designed plan for your weekly training sessions, balancing high-intensity work with smart recovery sessions, sufficient sleep, and nutrition, all while providing for deep tissue healing.
Understand Tissue Adaptation
The mechanical thresholds are different for each of the tissues in the human body, such as the Achilles tendon, the hamstring muscle belly, or the cortical bone of the tibia. When you are exercising your body, you want to deliberately load these tissues. This load is the correct amount in a balanced training environment and is sufficient to stimulate the brain to release repair cells to strengthen and harden the desired area. This is the most basic principle of developing fitness in the athletic domain.
But it’s all a race against time for the tissue to adapt. When the mechanical force applied during repeated training sessions is greater than the tissue’s capacity to structurally adapt, it is no longer in the adaptation range and passes over into the micro failure range. Tendons have less blood supply than muscles, and therefore recover much more slowly. For those who suddenly increase their weekly mileage, the calf muscles that surround the Achilles tendon may feel like they are fine, but the tendon itself can gradually take damage, resulting in chronic tendinopathy that can be debilitating. Precision load management optimises training progression in line with all tissue types’ cellular timelines.
Fatigue: The Inner-Outer Metrics of Tracking Internal VS External Loads
Athletes need to identify how much physical stress they are putting on themselves before and during training and evaluate whether it is causing a breakdown to their structure. Athletes should be able to distinguish between external and internal training loads and determine if a breakdown is occurring in their structure as a result of the external load. External loading is the physical task which you carry out in a session and is readily measurable. This can be anything from running 10 kilometres, lifting 5,000 cumulative kg in the gym, or sprinting at 25km/h. External measures are important but they provide only a part of the picture.
Internal load is the load of stress that your body is under during the completion of your external load, measured using heart rate, the Rating of Perceived Exertion (RPE), and sleep quality scores.
On a day when one is not fatigued, five kilometres could be a breeze. Doing that same run when you are not well rested, have a high workload or are slightly dehydrated will see your internal load rise into the stratosphere. If fatigue remains high, then your body’s structural repair mechanisms slow down and a regular workout becomes a high risk injury event.
De-loading Frameworks: The Strategic Architecture of Recovery
For many hard workers, rest is a weakness and a time-waster. Truthfully, while exercising, you aren’t getting fit; you’re getting fit in the recovery phase after your exercise. Planned “de-load” weeks should be included in a premier sports training program to allow for deeper tissue healing and to mitigate the risk of acute overtraining syndrome.
The standard de-load period is usually once every 3 – 4 weeks in a structured training cycle. In this stage, the entire load of training is cleverly decreased by 30%-40% and the intensity of training remains moderate. The intentional decrease in volume helps to reset the central nervous system, removes metabolic waste from muscles and provides the time for high-tension tendons to produce new collagen fibres. Systematic de-loads allow you to continually push your athletic baseline without hitting a plateau for injuries.
Under-Loading is the Hidden Danger: Avoiding the Fragility Trap
The most common cause of an acute soft-tissue injury is overloading, but in recent years, sports science has pinpointed another training mistake that can be just as dangerous: underloading. Some fitness enthusiasts make good use of the low amount of training they do, and make sure it is a very predictable amount so that their bodies will never be challenged. This protective strategy leaves people in a fragile state structurally.
The tissues of your musculoskeletal system continuously adapt to the low loads they face, by thinning and lowering their actual capacity. When you are in an under-conditioned tissue, all of a sudden have to sprint for a ball in a social game or lift a heavy object during a weekend project, your tissues simply can’t handle the sudden demand. There is no “heavy load” way to prevent injury, just a systematic progression that allows you to develop the foundation of training so that your body can handle very high load velocity safely.
Frequently Asked Questions
Q. What is the difference between the acute workload and chronic workload in sports training?
Your chronic workload is the minimum amount of training that you have accumulated and finished for the last month. Your acute workload is the sum of all the training stress you put on your body over the rest of the week.
Q. Why does an increase in training distance or intensity at any point in time result in a sports injury?
Sudden or excessive training load is deemed to be a training error. If you add in running longer, such as a 50% increase in running distance in one week, or add in high-speed sprinting without preparation, you’re putting a tremendous amount of stress on joints and tendons that are not structurally ready for that stress.
Q. How can an all-inclusive biomechanical examination prevent musculoskeletal failure?
A biomechanical screening is an analysis of your movement patterns in order to identify actively those joints with poor range of motion, weak muscles or subtle physical compensation. Identifying these imbalances early can result in intervention by the physiotherapist before they cause uneven stress in high speed training.
