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TRAINING SMARTER, NOT HARDER

6/9/2020

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There is emerging scientific research that training loads are directly correlated to injury risk.
Training load injuries are generally caused by:
  1. A spike training load from a period of inactivity or the training history of the individual 
  2. A high training load sustained for a long period (> 8 weeks) of time without recovery weeks or deloading 
  3. Sustaining a monotonous, consistent daily training load across the week without recovery days 

External vs Internal Training Loads
Specifically, there are 2 types of training loads: External Loads and Internal Loads. External loads measure the amount of external workload eg. (running on the treadmill, weight lifting) to the individual while internal load measures the individual’s post exercise heart rate or rate of perceived exertion (RPE) as a response to the external workload.
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Rate of Perceived Exertion Guides for Aerobic and Resistance Training

It is important to understand that to optimise performance, there needs to be a fine balance between training hard and overloading resulting in injuries and comprising performance. This sounds like common sense however to accurately monitor training loads is a challenging task given that it is associated with frequency, duration and intensity. Duration and frequency are relatively easy to measure however intensity could be measured by for example, how fast you are running, your heart rate, how much weight you are lifting with the barbell or the complexity or speed of the movements you are performing. Tracking your training loads is not just about managing the specific exercise you are doing but can help you determine when it may be appropriate for you to do some cross-training or vary your load. 

Acute on Chronic Workload Ratio (ACWR)

For those who are a serious about injury prevention,a great way to find your training ‘sweet spot’ while minimising the risk of injury if you are serious about optimising performance is using the Acute on Chronic Workload Ratio calculator. Scientific research indicates a 0.8-1.3 ratio range is ideal. Injury risk increases at a 1.5 ratio or higher.

To calculate your ratio, multiply your rate of perceived exertion (RPE) after each exercise with the duration, intensity or frequency of the exercise session (external load). The Acute Workload is over a 7 day period. The Chronic Workload is over a 28 day period. The ratio is the result of dividing the Acute Workload by the Chronic Workload. 
Tips:
  1. Use an activity tracker to monitor your training loads, noting the frequency, intensity and duration of your activities. Free GPS activity tracking apps recommended include Strava for cycling and running and RunKeeper for running. 
  2. Consider calculating and tracking your Acute on Chronic Workload Ratio (ACWR) 
  3. Consider varying the load (high, moderate and low) or cross-training on consecutive days for example, running on day one, lifting weights on day two and swimming on day three.
  4. Avoid sudden increases in load after a period of inactivity such as a break after a marathon event, post-injury or a relaxing holiday. 
  5. A rule of thumb is to increasing the exercise 5-10% per week (either frequency, duration or intensity) however it is important to be aware that a 5-10% increase in intensity is a significant change compared to a 5-10% increase in duration or frequency. 



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    Author


    ​Barry Nguyen
    ​Founder & Head Physio

    Barry is an Australian qualified physiotherapist with over 19 years clinical experience in sports and musculoskeletal injuries.
    ​
    Many of my patients and GPs whom I work with use this resource! 

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