Vodacom Super 14

Physiological demands of rugby

2010-03-02 15:38
Ross Tucker (File)
Ross Tucker

The Vodacom Super 14 competition puts elite rugby players through one of the toughest tests in the game – with up to 15 maximum efforts over 16 weeks, often across 10 time-zones against teams wishing to displace the Bulls as the reigning Super Rugby champions.

But exactly what is the physiological challenge faced by players in any given match?

Recent developments in technology have allowed the physiological demands of the game to be accurately quantified using GPS devices, giving us information on distance covered, running speed, heart rate, intensity of player impacts (g-force), and energy expended during matches.

These studies have shown the following:

- A backline player will experience about 120 ‘impacts’ per match – an impact is any involvement in a tackle, ruck/maul, or collision with the ground. Not surprisingly, forwards are involved in more impacts than backline players, with about 300 per match. Of these, 70 have a g-force greater than 8g, and the majority of impacts, somewhat surprisingly, come in the second half (65% compared to 35%).

- In terms of running, backline players can expect to cover between 7km and 7.5km a match, while forwards cover between 5km and 7km, depending on their playing position (loose forwards covering the most distance). About 70% of the match is spent standing or walking, 25% is spent jogging, and 5% running at sprinting speeds. This means that for every second spent running, players will rest or move slowly for about five seconds.

- However, the real challenge lies in the number of times players have to change speeds, either accelerating or decelerating for short periods. The average ‘sprint’ is 20 metres long, and it happens 30 times a match, while fast jogging for 20m happens 90 times a match. In total, there are shifts in speed approximately 750 times per player per match, or once every three to four seconds. The challenge in terms of conditioning is to prepare players for this constant shifting of pace and direction.

- Forwards spend more time doing very high intensity exercise, and less time walking or standing than backline players (65% of the match for forwards, compared to 75% for backs). This is explained by the forwards having more ‘static exertion’ periods – scrums, rucking and mauling. The result is that overall, even though backs do more running during a match; they actually do less total work than forwards. For example, in an 80-minute match, a loose forward can expect to burn about 2000 kCal, compared to 1 700 kCal for backline players. This is 25% higher than what has been measured for professional soccer players. By way of comparison, a 90kg man running a half-marathon (21km) burns about the same amount of energy as a Super 14 player every weekend!

- Finally, the physiological load is actually greater in the second half of matches. Players run further in the second half, with more accelerations and short sprints, and there are twice as many impacts in the second half. More time is also spent doing high-intensity running and less time walking in the second half of matches, especially for forwards, which says that play is more continuous in the second half. It’s perhaps not surprising then that scorelines often remain tight for 50 minutes before opening up – the last 30 minutes is where the physiology begins to tell!

Ross Tucker has PhD in Exercise Physiology from the UCT Faculty of Health Sciences and is currently a member of Paul Treu's SA Sevens management team.

Disclaimer: Sport24 encourages freedom of speech and the expression of diverse views. The views of columnists published on Sport24 are therefore their own and do not necessarily represent the views of Sport24.

NEXT ON SPORT24X

Hartley sees red for elbow

2014-12-20 19:51

 

Read News24’s Comments Policy

24.com publishes all comments posted on articles provided that they adhere to our Comments Policy. Should you wish to report a comment for editorial review, please do so by clicking the 'Report Comment' button to the right of each comment.

Comment on this story
7 comments
Add your comment
Comment 0 characters remaining
Live Video Streaming
  • Blitz
    Mon, 24 Nov 2014 @00:00
  • SS1
    Mon, 24 Nov 2014 @01:00
  • SS2
    Mon, 24 Nov 2014 @02:00
  • SS3
    Mon, 24 Nov 2014 @03:00
Video Highlights
Sport Talk

 

Joburg hot spots for cocktails, craft beer, tapas and wine!

It’s the season to be jolly – so we’ve rounded up some new Joburg hot spots!

 
 

I love summer.24

Summer Survey!
Great ideas for the best summer sandwiches!
Christmas lingerie to make this festive season the best one ever!
13 things you might not know about Disneyland
 
 
/Sport
Men
Women
Love 2 Meet
English Premiership flutter

Take Sport24's "expert" tips at your peril...

Featured

Got something you'd like to get off your chest? Got a burning desire to air an opinion? If so, be sure to sign-up on Sport24's FORUM!

Latest blogs
Vote

If Super14 champs, the Bulls, had to take on Heineken Cup champs, Toulouse, at a neutral venue, which side would win?

Twitter Follow Sport24 on Twitter

Facebook "Like" Sport24's Facebook page

Newsletters Sign up for the Morning Glory, Super 15 and Soccer newsletters

WIN Enter and win with Sport24!

Mobile Sport24 on your mobile phone - WAP, alerts, downloads, services

Forum Have your Say on Sport24's brand new Forum!

BlackBerry Stay in the loop on your BlackBerry

iPhone Latest Sport24 news on your iPhone

RSS Feeds Sport news delivered really simply.

Blogs Yes your opinion counts. Get it out there

 
There are new stories on the homepage. Click here to see them.