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Fix the Brakes: Focus on Deceleration Training for Tennis

10/29/2013

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All tennis players want to move faster on court and much of the training that many players perform is focused heavily on improving first step quickness and acceleration. Although training acceleration is vital for success as a tennis athlete, it is just as important to train for deceleration. An athlete who only develops acceleration will be great for one movement to a stroke, but will have difficulties slowing down quickly and then transitioning to an effective recovery movement pattern to change direction and move to a second, third or fourth shot. It is important to remember that:

Acceleration + Deceleration = Effective Tennis Specific Movement

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Dynamic Balance

Dynamic balance is paramount in tennis, specifically during the deceleration movement phase before the player makes contact with the ball. Dynamic balance is the ability of the athlete to maintain a controlled center of gravity while the athlete is moving. This efficient energy transfer from the ground up through the entire kinetic chain (from the ground all the way into the ball) will result into a more efficient and powerful tennis stroke - faster racket head speeds and ball velocities.   

Eccentric Strength

Eccentric strength requires training of the muscles during the lengthening phase of the muscle action. Eccentric strengthening exercises need to be performed both on two feet as well as one foot. Nearly all tennis movements require the athlete to load one side of the body more than the other, and it is paramount that these uneven loading patterns are trained eccentrically as well as concentrically. Some great research performed by Dr. Todd Ellenbecker (chair of the certification commission of the International Tennis Performance Association) as well as other researchers have shown that physically trained humans can support approximately 30% more weight eccentrically than concentrically.  Therefore, eccentric focused strength training needs to be incorporated into an athlete’s periodized program to successfully maximize their strength gains. A second major benefit of training eccentric strength is to aid in the prevention of injuries. A large portion of injuries to tennis players are due to insufficient eccentric strength in both the lower and upper body.

Power

Power for the tennis player is what directly translates into greater racket head speed and ball velocity. The power equation is (Force X Distance) / Time. In simple terms, a powerful athlete produces high forces, over the greatest distance, in the shortest period of time. The importance of power training for tennis is well understood by most coaches and trainers; however, power is typically trained with the major focus on the concentric phase of the muscle movements. Most medicine ball drills and plyometric movements focus on developing power. However, training focused on the landing aspect of the plyometric movements or the catching (instead of throwing) aspect of the medicine ball workouts are many times overlooked or not emphasized appropriately.

Reactive Strength

Reactive strength has been defined as the ability to quickly change during the muscle contraction sequence from the eccentric to the concentric phase in the stretch-shortening cycle (SSC), and is a specific form of muscle power. A plyometric training program which utilizes lateral and multidirectional movements while limiting time on the ground will develop reactive strength and subsequent power outputs in the muscles and movements that are seen during tennis play. This type of training directly relates to a tennis athlete in their recovery sequences between shots and also during the times in a point when they are “wrong-footed” and are in need of rapid change of direction.

Summary

Deceleration ability of a tennis athlete is closely linked to successful agility and multi-direction movements. As such, it needs to be trained in a multi-focused training program with appropriate rest periods and loads that are progressed based on the tennis player’s growth, maturation and training stages. From a training perspective the posterior muscles of the tennis athlete needs to be a focus if the athlete is to become a successful player who has great deceleration ability. Training athletes to accelerate and be fast is only half the equation; deceleration before (or immediately after) racket and ball contact is a major link in the chain for successful performance, and if the deceleration link is not trained optimally the athlete will never reach his or her full potential. It is highly encouraged that you work with a certified tennis performance specialist (CTPS) who has the required knowledge, skills and abilities to specifically train tennis athletes as training for deceleration is challenging due the higher forces (predominantly due to eccentric muscle actions) that are applied to the athlete to stop quickly.

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Monitoring Intensity During Tennis Training or Competition

10/2/2013

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Having an accurate way to measure your training intensity (from a player’s perspective) or monitoring your player (as a coach) is one of the most valuable metrics to help design training programs and add/reduce volume and /or intensity. Although much technology exists today, this post is focused on a tried and true technique that has stood the test of time in the scientific literature focused on monitoring an athlete’s intensity.

What is RPE?

The Rating of Perceived Exertion (RPE) is  a very common rating scale used in the scientific literature. It is a simple scale of asking someone how hard or difficult was the exercise or session. It is a good measurement of exercise intensity.

Perceived exertion is how hard you feel like your body is working. It is based on the physical sensations a person experiences during physical activity, including increased heart rate, increased respiration or breathing rate, increased sweating, and muscle fatigue. Although this is a subjective measure, a person's exertion rating may provide a fairly good estimate of the actual heart rate during physical activity (Borg, 1982). Since the 1980s thousands of studies have used this scale to evaluate how difficult the exercise session, training or competition was. Over multiple decades it has held up to scrutiny and is one of the best measures available. Even with all the great technology that is available today, the RPE scale is still the one of the most reliable and accurate ways to measure how intense an athlete feels a workout has been.

From a tennis perspective, the use of the RPE scale is good way to quickly and easily gain a read on how difficult or intense the training session or match was. It has been used by coaches and tennis scientists for decades to monitor athletes to see the perceptions of different types of training programs and to provide insight into when to increase or decrease intensity of workouts. One interesting study has recently been published in Australia highlights that when tennis players and coaches both evaluate the intensity of e a training session, rather good consistency existed when training on hardcourts. However, when playing on claycourts coaches underrate the perception of the training session (Reid et al, 2013). This underrating is in comparison to player rating of the same session.

For The Player:

Monitor your sessional-RPE at the end of each training session and provide yourself a rating of the entire workout on a daily basis. Over the course of a few weeks you will start seeing some trends in the workouts and you can start using this information to adjust the difficulty of the workouts based on your goals.

For The Coach:

Monitor your player’s sessional-RPE daily and have the player monitor his or her sessions daily. Compare the ratings to see how close the player and coach and use this information to effectively adjust training sessions to continue to make weekly improvements.

The Scales

Two scales are commonly used. The original scale was developed by Gunnar Borg and follows a 6-20 range. Whereas, the modified Borg CR-10 scale follows a 0-10 scale..

Traditional Borg Scale (6-20) this information has been adapted from http://www.cdc.gov/physicalactivity/everyone/measuring/exertion.html

The traditional Borg scale was designed to coincide with an athlete’s heart rate. Therefore, 6 represents a resting heart rate value (60) and 20 represents a maximum heart rate value (200). Look at the rating scale below while you are engaging in an activity; it ranges from 6 to 20, where 6 means "no exertion at all" and 20 means "maximal exertion." Choose the number from below that best describes your level of exertion. This will give you a good idea of the intensity level of your activity, and you can use this information to speed up or slow down your movements to reach your desired range.

Try to appraise your feeling of exertion as honestly as possible, without thinking about what the actual physical load is. Your own feeling of effort and exertion is important, not how it compares to other people's. Look at the scales and the expressions and then give a number.

6  No exertion at all
7
Extremely light (7.5)
8
9  Very light
10
11  Light
12
13  Somewhat hard
14
15  Hard (heavy)
16
17  Very hard
18
19  Extremely hard
20  Maximal exertion

9 corresponds to "very light" exercise. For a healthy person, it is like walking slowly at his or her own pace for some minutes

13 on the scale is "somewhat hard" exercise, but it still feels OK to continue.

17 "very hard" is very strenuous. A healthy person can still go on, but he or she really has to push him- or herself. It feels very heavy, and the person is very tired.

19 on the scale is an extremely strenuous exercise level. For most people this is the most strenuous exercise they have ever experienced.

0-10 Scale

0 - Nothing at all

1 - Very light

2 - Fairly light

3 - Moderate

4 - Some what hard

5 - Hard

6

7 - Very hard

8

9

10 - Very, very hard

Resources:

Current Comment from the American College of Sports Medicine on RPE - http://www.acsm.org/docs/current-comments/perceivedexertion.pdf

References:

BORG, G. (1982) Psychophysical bases of perceived exertion. Medicine and Science in Sports and Exercise, 14 (5), p. 377-81

REID, M et al. (2013) Physiological, perceptual, and technical responses to on-court tennis training on hard and clay courts. Journal of Strength and Conditioning Research. 27 (6); 1487-1495

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