Optimizing Load Management

November 1, 2021 Metrifit

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Acute Chronic Workload Ratio

The acute:chronic workload ratio is one method that is used by many Sport Science and Strength and Conditioning practitioners. The ratio provides a periodic overview of what the athletes workload has been, and therefore how prepared they are to perform. The protocol therefore allows the manipulation of training load through a greater understanding of an athletes ‘readiness to perform’ and likelihood of injury.
Speaking to Metrifit in 2016 lead researcher of the acute:chronic workload ratio Tim Gabbett stated

It’s not the load that’s the problem, it’s what you’ve prepared for

It is well documented that high workloads are not an issue, and in a study conducted by Hulin and Gabbett it is concluded that high chronic workloads are protective against injury when acute workloads are similar to chronic workload. Gabbett concludes:-

The trick is trying to build these chronic loads to try and protect you from injury and to get there in a safe way

The specific acute and chronic periods used to assess workload should be sport specific and dependent on competition congestion. For example, the periods used to assess workload in the NBA (where on average 3.5 games are played weekly for a total of 82 games) and that of the traditional Gaelic Athletic Association championship season (where it took football champions Dublin a total of 7 championship games to reach the final) may vastly differ. For the purpose of simplicity and as it is the most commonly adopted period, we will look at the acute period over 7 days, and the chronic period over the course of 28 days.

Workload can be monitored by external (e.g distance covered, number of sprints/jumps/throws, weight lifted) and internal measures (e.g session-rating of perceived exertion x session duration, heart rate). As individuality exists amongst athletes (i.e the internal response to an external stimulus) using both is likely advantageous.

Acute Workload

The acute period is represented as the fatigue element of the ratio. Ensuring the acute workload stays within a range of the chronic period is advised in the monitoring of workload and to reduce an athlete’s injury risk. This becomes even more problematic following training breaks such as at the beginning of pre-season, post injury and following low contact time such as training restrictions (such as those currently faced due to the current coronavirus pandemic) or opposingly where contact hours may increase during a team trip away.

Chronic Workload

The chronic workload is represented as the fitness element of the ratio. It is most often viewed over a 28-day period and is the average workload of the 4 weeks. This provides an indication of what the athlete has done over the previous month, and therefore how ready he/she is to perform at optimal levels.
Example
Week 1= 18,000km
Week 2= 20,000km
Week 3= 16,000km
Week 4= 20,000km
Chronic Workload= (18,000+20,000+16,000+20,000)/4= 18,500

The acute:chronic workload ratio is calculated by dividing the acute workload by the chronic workload. If we take the acute workload of week 4 (20,000km) and divide it by the chronic workload (18,500), we get a ratio of 1.08.

The interpretation and application of data

Readiness to Perform
The acute:chronic workload ratio has been shown to be useful to determine readiness to train/perform. If an athlete’s acute workload load is high and the ratio exceeds 1.0, the athlete is in a negative training-stress balance and a fatigued state. Opposingly, where the athlete’s chronic workload exceeds the acute workload ratio the athlete is in a positive training-stress balance and a well-prepared state. The ratio here will be 1 or less.

Risk of Injury
As is well documented, injury risk increases as the acute workload outweighs the chronic workload. Furthermore, the greater the increase in acute workload the larger the risk of injury. Hulin and Gabbett found a threefold and fourfold increase in injury risk when training stress balance exceeded 200% in cricket and up to a tenfold increase in the injury risk in elite rugby league players. As a result, the monitoring of training load is becoming increasingly popular in high performance sport to ensure athletes receive an adequate stimulus whilst minimizing the negative effects of training.

Taken from three different sports (rugby league, Australian football, and cricket), a guide to interpreting and applying to acute:chronic workload ratio has been provided by Blanch and Gabbett.

• <.8 = Increased risk of injury (Under-training)
• .8-1.3 = Lowest relative risk of injury (‘’The Sweet Spot’’)
• >1.5 = Highest risk of injury (The Danger Zone’’)

These ranges can be used to help guide the practitioner to assess how appropriate the training load is rather than using them as strict rules. It should be used alongside the practitioner’s intuitive ‘expertise’ and understanding of individual athletes. Individuality exists among athletes with robustness and tolerance dependent on a multitude of factors including training age, injury history and athletic development.

Practical guidelines for Load Management

The International Olympic Committee consensus statement on load in sport and risk of injury guidelines include:-

Athletes should limit (or be limited to) their weekly increase in training load to <10% or maintain an acute:chronic workload range of .8-1.3.
Where match congestion occurs, squad rotation should be considered to prevent large spikes in workload for individual players.
Load management measures should be prescribed individually as large inter- and intra- individuality exists.
Coaches and staff should support adequate recovery strategies including nutrition and hydration, sleep and rest, active rest, relaxation strategies and emotional support where applicable.
A combination of internal and external measures (relevant and specific to the sport) should be used including subjective and objective measures
Reducing workload and intensity to mitigate the risk of injury in athletes who appear stressed/ report high levels of daily hassle may be advantageous
Injury monitoring should be on-going/periodic at least.

Limitations

Although the acute:chronic workload ratio does for sure have its uses, the research around it does have some limitations:-

Sparse Data Available
Recent studies on the acute:chronic workload ratio have been small in number and have used small sample sizes (notably in cricket, rugby, and hockey). Further research is necessary modelling training loads and injury risk with larger sample sizes in a multitude of sports.

Use of Unweighted Averages
The chronic load uses the average workload over a period of time. However, when averages are used, variations in workload over a set period of time are overlooked. Athletes with contrasting training patterns can have the same acute:chronic ratio and therefore be assigned the same injury risk. Despite this, the injury risk may be conceivably different depending on how their workload was distributed. Similarly, athletes who complete all of their workload on one single day might be at a greater risk of injury than an athlete who distributes the same workload throughout the week.

Mathematical Coupling
Mathematical coupling is where a number is represented in both the numerator and denominator of a ratio, contributing to a spurious correlation. In the measure used in the acute:chronic workload ratio the acute load is included in the calculation of the chronic load. Therefore, it is mathematically coupled and a proportion rather than a true measure in change. If workload spikes during the acute period, it will contribute a greater proportion to the chronic load average. It has been proposed that the use of an uncoupled measure (where the acute load is removed from the chronic load calculation) should be used as a solution.

Conclusions

Athlete monitoring is a multifaceted process. Internal and external load monitoring, athlete wellness and readiness to perform are all important considerations. The acute:chronic workload ratio is a tool which can help guide practitioners appropriately manipulate load. However, it should not be used in isolation, and instead used in conjunction with other information such as an athlete’s internal risk profile, how the athlete is tolerating training and information from daily well-being reports. Using Metrifit’s Session-RPE can provide an internal workload measure and help inform athletes and practitioners alike.

Thresholds for optimal load changes from week to week will continue to be debated and explored by researchers, but the principle remains true; finding the balance is key to reducing injury risk and optimizing physical development. Metrifit’s Session-RPE Module is our tool to finding this sweet spot on an individual and team basis – Cairbre Ó Cairealláin, Strength and Conditioning coach with Senior Tipperary Hurling Team

What is Metrifit?

Metrifit provides a simple and effective method for athletes to record their well-being and training responses as part of its athlete monitoring package. Athletes can communicate with you everyday via psychometric data such as sleep quality, sleep duration, stress levels, muscle soreness. Session-RPE can be used for monitoring training loads and GPS information can also be integrated. To find out more about the Metrifit Ready to Perform product and gain insight on the physical and mental state of your athletes through our daily wellbeing questionnaire contact us at .

About the author

Michael is a Sport Science student intrigued by understanding the variables and key determinants that impact an individual’s (athlete or general population) readiness to perform from both a psychological and a physiological standpoint. His primary areas of research revolve around physical development and the role of nutrition, sleep and stress in physical development. Michael works in multiple strength and conditioning environments from Rugby to Soccer to GAA, and also runs an online coaching service at Synthesize Coaching.

Follow @metrifit

References

The Relationship Between Training Load and Injury, Illness and Soreness: A Systematic and Literature Review by Michael K Drew, Caroline F Finch

How much is too much? (Part 1) International Olympic Committee consensus statement on load in sport and risk of injury

The acute:chronic workload ratio predicts injury: high chronic workload may decrease injury risk in elite rugby league players | Hulin, Gabbett et al

Train Smarter AND Harder Webinar with Tim Gabbett

Spikes in acute workload are associated with increased injury risk in elite cricket fast bowlers | Hulin, Gabbett et al

The acute:chronic workload ratio predicts injury: high chronic workload may decrease injury risk in elite rugby league players | Hulin, Gabbett et al

The training—injury prevention paradox: should athletes be training smarter and harder? | Tim Gabbett

Why should you monitor your athletes? | Metrifit

"Metrifit is an amazingly easy-to-use yet comprehensive monitoring tool for training and recovery! The elite athletes we work with are able track and monitor their situations and states daily, in order to maximize their performance loads and recovery practices. This also helps our coaches customize the training programs ‎more effectively. I'd recommend this for any serious team / athlete or coach in wanting to bring out the very best in their long-term performances! "

Edgar K. Tham

Founder and Chief Sport & Performance Psychologist, SportPsych Consulting (Singapore, Indonesia, Philippines)

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Founder and Chief Sport & Performance Psychologist, SportPsych Consulting (Singapore, Indonesia, Philippines)

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"The success of young athletes using Metrifit was an interesting challenge in the Elite Soccer space… After six months of learning, creating habit with teenagers the project is a huge success…. 90% completion rate has allowed us deal with all the key KPI’s that are needed in their development. In our space with developing athletes…Metrifit is a godsend and is the most important tool in this space."

Niall O’Driscoll

Academy Directory, SJ.B (St. Joseph’s Bray ) Academy

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Niall O’Driscoll

Academy Directory, SJ.B (St. Joseph’s Bray ) Academy

"The success of young athletes using Metrifit was an interesting challenge in the Elite Soccer space… After six months of learning, creating habit with teenagers the project is a huge success…. 90% completion rate has allowed us deal with all the key KPI’s that are needed in their development. In our space with developing athletes…Metrifit is a godsend and is the most important tool in this space."

https://metrifit.com/blog/testimonials/niall-odriscoll-short/

"The holistic approach of medical, physical, emotional and even tech/tactical; bringing together what we need to monitor and evaluate our University players. “If you can’t measure it – it doesn’t exist.” I know we were the first Canadian University to use the program and I know many more will be asking for it in the future! I highly recommend Metrifit."

Tino Fusco, B.Sc. ChPC

Head Coach, Women's Soccer, Mount Royal University (Canada)

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2017-06-12T14:25:37+01:00

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Head Coach, Women's Soccer, Mount Royal University (Canada)

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"The visualisation of data allows for easy discussion between athletes, performance staff and medical teams and offers the potential to predict and avoid issues which could hamper performance. Over the year the data has proven instrumental in our critical decision making. Metrifit is a excellent monitoring tool however the unsung additional aspect is the fantastic and tireless customer support."

Robert Walsh

Strength Coach

Nederlandse Ski Vereniging (Netherlands Ski/Snowboard Team)

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Strength Coach

Nederlandse Ski Vereniging (Netherlands Ski/Snowboard Team)

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"Metrifit has been hugely beneficial in supporting our coaches and back room staff to track and monitor our players training loads, performance and readiness to train. Having a one-stop shop for collating all relevant information across a holistic picture of the player allows us to help prevent burnout, injury and provide timely feedback and communication to all."

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Kerry Senior Football, Manager

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Kerry Senior Football, Manager

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"When our players have been only training with the national team Metrifit allows me to liaise very closely with our conditioning coaches to manage load and intensity of training during training camps. I recommend it to anyone who wants an easy to use monitoring system."

Dave Passmore

Head Coach, Irish Hockey

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Dave Passmore

Head Coach, Irish Hockey

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"The ability to acutely monitor stress and recovery and make the correct adjustments was critical to our health and performance throughout the NCAA tournament. Metrifit has a very strong educational component. With the information we get, I am able to clearly understand the habits and behaviors of our athletes, and how they may be impacting performance."

Erik Helland

Director of Strength & Conditioning and Head Strength Coach Men’s basketball, University of Wisconsin

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Director of Strength & Conditioning and Head Strength Coach Men’s basketball, University of Wisconsin

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"Metrifit has been a great asset in helping guide the numerous decisions we make on a daily basis, that have a direct impact on our athletes well-being and progress. The platform is extremely user friendly and the reports and analytics that reflect the data collected daily, can be catered to what you are most specifically curious to know about the athletes both individually and collectively"

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Head Coach, LMU Lions, Loyola Marymount University

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Head Coach, LMU Lions, Loyola Marymount University

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"Our coaches through Metrifit basically have an ‘X-ray’ vision into the habits and lifestyles and stressors their athletes have on a day to day basis, especially when they are not together. Thus the professional authentic relationships created through the casual conversations, reflection process and application provided is priceless."

Brian Clarke

Head Strength and Conditioning Co-ordinator,Noblesville High School

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Brian Clarke

Head Strength and Conditioning Co-ordinator,Noblesville High School

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"Gaelic football is an intermittent high-intensity collision-based field sport requiring high levels of endurance, strength, power, agility, and speed as well as proficiency with gaelic-related skills. These components comprise the training modalities used at the elite level and the monitoring of such a vast range of modalities is central to peak performance. The athlete monitoring tool Metrifit allows us to do this and can keep us one step ahead of our competitors."

Jason McGahan

Sports Scientist, Kildare Football, PhD Sports Science Researcher

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Sports Scientist, Kildare Football, PhD Sports Science Researcher

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"While working with the Clare Senior Hurling team (2012-2014), Horse Sport Ireland (U25 European Eventing Champions) and currently with the Limerick Senior Hurling Team, Metrifit provides our team with critical information across a number of essential aspects of elite athletic performance. You don’t really know how your players are responding to training stimuli unless you have daily data and Metrifit provides and easy to use and highly effective means of finding this critical information."

Joe O’Connor

NISUS Fitness, S&C Coach Clare Senior Hurling, Horse Sport Ireland and Limerick Senior Hurling

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NISUS Fitness, S&C Coach Clare Senior Hurling, Horse Sport Ireland and Limerick Senior Hurling

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"Metrifit is an outstanding platform to track your athletes’ wellness. It’s simple to use, easy to implement and gives outstanding information on your athlete’s subjective wellness which can be used to assign training loads. I highly recommend Metrifit for any coach looking to begin implementing technology into their program"

Brijesh Patel

Quinnipiac University, Head Strength and Conditioning Coach

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Brijesh Patel

Quinnipiac University, Head Strength and Conditioning Coach

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“Metrifit has allowed us to gain better insight on our athletes and their individual stress response to training and outside factors. This has helped us to make daily adjustments when necessary, to further enhance their development which has led to higher performance levels, faster recovery, and a reduction in injuries. The new lifestyle profiling survey has been an invaluable insight into the lifestyle habits of my athletes and has helped focus on key areas that can be improved, benefiting athletes on their performance journey.“

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Assistant S&C Coach, Tulane University

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Assistant S&C Coach, Tulane University

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"Metrifit has been used to gain a more in-depth insight into our student-athlete’s progressive athletic development and balance relative to their particular sporting and training activities, academic studies and total load. Metrifit doesn’t just help with optimising our Sports Scholarship students’ athletic performance. It assists us in helping them get the balance right between their sporting activities and academic studies."

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Lincoln University Athletic Performance Manager

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Richard Deuchrass

Lincoln University Athletic Performance Manager

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“I have been using Metrifit for the past number of years and I have found it to be an excellent piece of software. It is extremely easy to use and has proved very beneficial in preparing myself for competition. The ability to view my health and wellbeing stats everyday and see how this influences my performance in both practice and competition has been very helpful. I have been able to put more effort into key areas such as fluid intake, sleep and balanced golf practice and training. Having the ability to view my detailed stats helps me to understand exactly where I am and how I need to adjust my training or health choices. I have found using Metrifit this past year has been a crucial help for me to play well. As I now have turned 50 I am playing on The Champions tour in the USA and have played well during my first year. Metrifit has been as important as my golf equipment in achieving that success.”

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"Metrifit is an integral part of the set up within the senior and intermediate inter-county Camogie. The data collected daily on the individual players is critical to the decision making of the backroom team including, managers, trainers, selectors, physiotherapist and indeed myself. As a nutritionist it allows me to monitor the quality of the player’s diet, energy levels, sleep pattern and overall wellbeing."

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Nutritionist, Wexford Camogie

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Nutritionist, Wexford Camogie

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"We started using Metrifit to see if it gave us better predictability and allowed easier monitoring than our DIY excel sheets prior to the Tokyo qualifiers. In a sport where measuring training load is very difficult, Metrifit filled a huge gap in our ability to monitor our athletes’ performance state and recovery. After some months of collecting data I was able to clearly see when to back off and when to keep going with different aspects of the training programme, as well as when to provide extra care and support for our elite athlete – and without a doubt it is much more informative and sensitive than our DIY model, not to mention much easier! Looking forward to the next Olympic cycle with Metrifit as one of our essential tools."

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Coach - Sweden Climbing, Olympic Offensive - Female Coach Swedish Olympic Committee, Senior Lecturer - Coach education programme (Sweden)

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Coach - Sweden Climbing, Olympic Offensive - Female Coach Swedish Olympic Committee, Senior Lecturer - Coach education programme (Sweden)

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"When COVID altered college athletics as we knew it, Metrifit came to the rescue. This intuitive athlete monitoring, health and well-being system provides the athlete, coach, and sports medicine staff a way to monitor and balance the physical, emotional, health and well-being of our athlete’s. Metrifit provided that calm in the middle of the perfect storm for our entire athletic department for the future. Thank you to the entire Metrifit family for assisting our department with a seamless process."

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Head Athletic Trainer, Colorado School of Mines

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Jennifer McIntosh

Head Athletic Trainer, Colorado School of Mines

"When COVID altered college athletics as we knew it, Metrifit came to the rescue. This intuitive athlete monitoring, health and well-being system provides the athlete, coach, and sports medicine staff a way to monitor and balance the physical, emotional, health and well-being of our athlete’s. Metrifit provided that calm in the middle of the perfect storm for our entire athletic department for the future. Thank you to the entire Metrifit family for assisting our department with a seamless process."

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Graham Williams

Athletic Development Coach, MSc ASCC
Millfield School, UK

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Graham Williams

Athletic Development Coach, MSc ASCC
Millfield School, UK

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"I wanted to reach out to thank Metrifit for an extremely successful season. Our Regis University women’s side won the ultra-competitive RMAC with a 11-0-1 record. Our student-athletes reported in post-season interviews the positive use of Metrifit that enabled their own reflection about their bodies and also found value providing information to coaches for our strategic planning purposes. On more than one occasion, we recognized deviations from norms and were able to step-in with a quick chat to help a player get back on track or refer her to the proper support personnel for further assistance. Fantastic! "

J.B. Belzer
Head Coach, Women's Soccer at Regis University

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J.B. Belzer
Head Coach, Women's Soccer at Regis University

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"The cutting edge technology of Metrifit enables Managers, Coaches and Players to use this innovative technology to gain these crucial percentage points over their opponents in a technologically advanced yet easy to use web-based platform. The data collated on a daily basis greatly informs Management Teams while the educational aspect of the system really appeals to modern day athletes who are constantly looking for that extra edge."

Cian O’Neill

Kildare Senior Football Manager

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Cian O’Neill

Kildare Senior Football Manager

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"We have been using Metrifit for the past season at Cornish Pirates. It has been greatly beneficial for us to have our wellness and load management data on one easy to access system. We have found this invaluable over the past season whereby Coaches, Physios and Strength and conditioning coaches can monitor both the psychological and physiological load of our athletes on a daily basis."

Paul Cremin

Head Physiotherapist, Cornish Pirates Rugby Club

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Paul Cremin

Head Physiotherapist, Cornish Pirates Rugby Club

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"We have found metrifit to be a great tool to ensure we can monitor and adapt our athletes training loads regularly. This programme has ensured our coaches and staff can maximize all training and recovery to each individual needs on a day to day basis. It is user friendly and provides excellent visual data that can be viewed by both practitioners and athletes. With the help of Metrifit support team, we have personalized it to suit our specific sport and training needs. It's a excellent athlete monitoring tool and is essential for assisting the team to perform at their best"

Lee Stutely

Team Manager and Athlete Support Services Coordinator at Great Britain Wheelchair Rugby

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2021-06-25T11:19:31+01:00

Lee Stutely

Team Manager and Athlete Support Services Coordinator at Great Britain Wheelchair Rugby

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"Metrifit has provided me with an opportunity to get to know and understand our players on a different level. I've found our conversations to be more intentional, which has been so important in developing deeper, more authentic relationships. Ultimately, understanding their needs has allowed me to push buttons that leads them to be better people and inspires them to be better athletes"

Ryan Osborn

Head Basketball Coach, Carmel High School

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2021-04-27T11:10:43+01:00

Ryan Osborn

Head Basketball Coach, Carmel High School

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"I've found Metrifit an invaluable resource. Not only to monitor daily wellness, readiness to train and training load within the squad, but also to monitor training load externally with additional external squads. Furthermore, Metrifit has acted as a key teaching tool, allowing young athletes associate good sleeping, eating and recovery habits to an improved sense of wellness and thus superior on-field performance."

Tommy Mooney

Strength and Conditioning Coach at DCU Sport and with Dublin Minor GAA

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2017-06-14T13:31:14+01:00

Tommy Mooney

Strength and Conditioning Coach at DCU Sport and with Dublin Minor GAA

https://metrifit.com/blog/testimonials/tommy-mooney-short/

"As a school that cannot spend large amounts of money on athlete monitoring, Metrifit has provided us with a great tool for monitoring stress and athlete readiness at a great rate. Being athlete driven, we're able to get buy-in from the athlete, and drive individual or team wide conversations regarding lifestyle and performance education in the direction needed. Seeing acute and chronic stress on a real-time basis has greatly improved the way we schedule workouts and arrange travel during the season."

Derek Bol

Strength & Conditioning Coach, Valparaiso University

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2017-06-20T22:26:45+01:00

Derek Bol

Strength & Conditioning Coach, Valparaiso University

https://metrifit.com/blog/testimonials/derek-bol/

"Metrifit provides immediate insight and feedback on the physical and mental states of the student-athletes. It allows us to adjust practices and training sessions to accurately meet needs. We have been able to identify potential injury concerns, track current injury status and monitor return to play progress."

Kari Thompson

Head Volley Ball Coach, Southern Illinois University

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2017-06-16T15:08:31+01:00

Kari Thompson

Head Volley Ball Coach, Southern Illinois University

https://metrifit.com/blog/testimonials/kari-thompson/

"The Metrifit RTP platform is an excellent tool to monitor, evaluate and make the right decisions for your athlete’s well being and performance. It enables coaches and athletes to track and sift through all the variables that underpin well being and performance on a day to day basis and to address an issue or potential issue in real time. A simply wonderful product."

Dr. Dale Richardson

CEO Achieve Total Performance Pty Ltd

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2019-03-04T21:38:45+00:00

Dr. Dale Richardson

CEO Achieve Total Performance Pty Ltd

https://metrifit.com/blog/testimonials/dale-richardson/

"Metrifit has been instrumental in helping our international Managers, Coaches and Medical teams to identify players who require modifications in training loads or who are struggling with some aspect of their preparation for, or recovery from, training and matches. One of the big strengths of this technology is that it allows our Managers and Medical teams to monitor players both during international competition and outside of these times."

Dan Horan

Head of Fitness for International Football/Fitness Coach Men's Senior Team
Football Association of Ireland

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2017-06-16T15:11:55+01:00

Dan Horan

Head of Fitness for International Football/Fitness Coach Men's Senior Team
Football Association of Ireland

https://metrifit.com/blog/testimonials/dan-horan-short/

“Metrifit has become a multifactorial platform that has helped up us provide deeper context to the decisions that we make on a daily basis in regards to the physical development of our student-athletes. We have intimately been utilizing both the subjective wellness questionnaire along with player training load data to drive professional conversation and actionable tasks to enhance the sporting results and quality of life for our student-athletes with unparalleled success.”

Kevin Schultz
Associate Director of Strength & Conditioning
Director of Olympic Strength & Conditioning
University of Wisconsin

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2017-06-20T12:12:33+01:00

Kevin Schultz
Associate Director of Strength & Conditioning
Director of Olympic Strength & Conditioning
University of Wisconsin

https://metrifit.com/blog/testimonials/kevin-schultz-full/

"What’s more impressive is the ability to utilize the basics but at the same time have the capability to explore detailed and intricate correlative data points that helps us as coaches gain the most from our athletes. Metrifit has also served as an easy communications hub to ensure essential information is passed to the appropriate team. We are excited to what the future from Metrifit will bring."