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Sports Physiology

Characteristics of Motor Activity in Tennis

Each sport discipline should be analyzed in terms of its specific energetic demands. This allows for targeted training of the energy-supplying systems that ensure optimal metabolic and physiological adaptation in the athlete’s body. A fundamental principle is that improved energy-supply capacity leads directly to enhanced athletic performance.

Tennis is a sport involving complex motor activity, characterized by a mixed (cyclical–acyclical) movement structure and an intermittent-variable nature. Its energy supply is based on both aerobic and anaerobic (primarily glycolytic) mechanisms. The workload is of high volume and intensity, and the motor actions have a speed-strength profile, expressed with great variability over a prolonged period and under conditions of compensated fatigue.

Compensated (or hidden) fatigue refers to a state in which performance efficiency is maintained for a certain duration through redistribution of effort. In this mode, stronger elements in the motor system compensate for temporarily weakened ones.

The main goal of sports training in tennis is the development of speed-strength endurance and effective motor regulation, built upon a broad aerobic foundation. This creates the physiological and motor basis for sustained high-intensity performance and enhances recovery between playing sequences.



Tennis

Periodization and Training Cycles in Tennis

What is Periodization?

Every tennis player with high competitive goals must understand the importance and function of periodization 


     Definition

Periodization is a long-term training plan designed to optimize athletic development and enable the player to reach and maintain peak performance during key competition periods.

✅ Why is it necessary?

Effective periodization:

  1. Reduces the risk of overtraining

  2. Prevents undertraining

  3. Minimizes the likelihood of injuries

  4. Ensures the athlete reaches peak physical form at the most important tournaments

Key Principles of Periodization

Periodization is based on several foundational training principles:

  • Adaptation – The process through which the athlete’s body becomes stronger, more resilient, and better prepared for performance.

  • Frequency – Refers to how often training sessions occur. It varies across the training year and includes how many consecutive days or times per day the athlete trains.

  • Intensity – Relates to the level of physical effort. Includes load, speed, and the percentage of the athlete’s maximum capabilities involved in the sessions.

  • Specificity – The degree to which the training simulates match conditions. As competition approaches, the training should become increasingly specific and match-like.

  • Variation – Incorporates different types of training stimuli, exercises, drills, and partners. Maintains motivation, prevents monotony, and supports comprehensive athletic development.

  • Recovery – A critical phase that includes both passive and active rest. Recovery ensures physiological adaptation and prevents burnout.

Note: Peak physical form can be maintained for 2–3 weeks. Typically, athletes can achieve 3 to 5 peak periods per year.

Working Plan – Application

  1. Develop a 12-month tournament calendar

  2. Identify key competition phases and plan training to match peak performance with those periods

  3. Build a main training cycle, subdivided into macro-, meso-, and microcycles

  4. Structure the training into four phases:

    • Preparatory phase

    • Pre-competition phase – entering peak form

    • Competition phase – maintaining performance

    • Post-competition phase – active rest and recovery

  5. Provide clear implementation strategies and focus points for each phase

  6. Define a methodical approach to reaching and maintaining peak condition

  7. Emphasize functional development (aerobic, anaerobic capacity, etc.)

  8. Include technical development (skills, execution, precision)





       GENERAL PERIODIZATION OF PHYSICAL DEVELOPMENT BY AGE

(according to the ITF Advanced Coaching Manual)

      Key Physical Components and Age Guidelines:

---------+----------+----------+----------+----------+----------+--------+
| Physical Quality       | 5–8 y. | 8–10 y. | 10–12 y. | 12–14 y. | 14–16 y. | 16–18 y. | 18–20 y. | 20+ y. |
+------------------------+--------+---------+----------+----------+----------+----------+----------+--------+
| Maximal Strength       |        |   1     |    2     |    3     |    3     |          |          |        |
| Explosive Strength     |        |   1     |    2     |    2     |    3     |    –     |          |        |
| Strength Endurance     |        |   1     |    2     |    3     |    3     |          |          |        |
| Aerobic Endurance      |   1    |   1     |    2     |    2     |    3     |    –     |          |        |
| Anaerobic Endurance    |        |   1     |    2     |    3     |    3     |          |          |        |
| Reaction and Speed     |   1    |   1     |    2     |    2     |    3     |          |          |        |
| Flexibility            |   2    |   2     |    2     |    3     |          |          |          |        |
| Coordination           |   1    |   2     |    3     |    3     |          |          |          |        |

        Legend:

  • 1 = Introduction to training – light basic sessions (approx. 1–2 times per week)

  • 2 = Development stage – increased training frequency and intensity (approx. 2–4 times per week)

  • 3 = High-performance level – structured, high-intensity work (4+ times per week)

  • – = Progressive maintenance – continued conditioning without major increase in load

        General Guidelines:

  • Physical development must be age-appropriate and aligned with stages of biological maturation.

  • In the early years (5–12), the priority is on coordination, flexibility, and reaction speed, which serve as the foundation for future performance.

  • In the middle years (12–16), the focus shifts to strength development and aerobic/anaerobic endurance, always respecting individual growth rhythms and safety.

  • In the advanced stages (16+ years), targeted training of maximal strength, power, and sport-specific endurance becomes essential, fully integrated with technical-tactical and competitive preparation.





Tennis Statistics

  • A single match can last from 30 minutes to 3–6 hours

  • Players can make over 1,100 strokes per match

  • The total running distance can exceed 3,600 meters

Maximum Number of Games

  • 3-set match: up to 36 games

  • 5-set match: up to 65 games

Types of Movement Directions During a Match

  • Forward – 19.8% (slow coverage)

  • Backward – 10.6% (slow coverage)

  • Left – 17% (fast coverage), 34.2% (slow coverage)

  • Right – 14.8% (fast), 36.3% (slow)

  • Forward-left – 19.4% (fast coverage)

  • Forward-right – 20.6% (fast coverage)

  • Backward-left / backward-right – no specific data

  • Curved / arcing movement – also observed

Distance Covered Per Rally or Game

  • Fast court coverage:

    • Per stroke: average 5.9 ± 1.0 m; max 17 m

    • Per game: average 63.6 ± 15.8 m; max 213 m

    • Per set: average 642.9 ± 148.5 m; max 818 m

  • Slow court coverage:

    • Per stroke: similar range, max 19 m

    • Per game: average 99.3 ± 15.1 m; max 262 m

    • Per set: average 1113.8 ± 344.5 m; max 1802 m

  • In a 5-set match:

    • Fast coverage total: ~13,845 m

    • Maximum recorded: up to 17 km

Time for Work and Rest

  • Rally duration: 1–3 to 10–20 seconds

  • Rest between points: 20–30 seconds

  • Rest between games: 90 seconds

Physiological Load During Competitive Matches

IndicatorMenWomen
Min. Heart Rate (HR)131 ± 5.3 bpm134 ± 15.5 bpm
Avg HR165 ± 8.0 bpm173 ± 4.9 bpm
Max HR202 bpm203 bpm
HR during rest135 ± 7.4 bpm141 ± 6.8 bpm
Avg HR as % of Max HR85.8%83.1%
Total Heartbeats/Match16,800 ± 204215,572 ± 4437
Weight loss1.5–3.0 kg0.8–2.0 kg

Heart rate data shows high cardiovascular demand in tennis, comparable with other sports and combat disciplines.

Heart Rate Trends During a Match

  1. HR increases with longer and faster rallies

  2. HR increases under psychological stress, even at low tempo

  3. HR decreases with reduced rally intensity

  4. HR increases again toward the end of the match, even at constant pace

Overall Movement Distribution

  • Forward running – 47%

  • Lateral (side) movement – 48%

  • Backward movement – 5%

Key Physiological Conclusions

  • The correlation between HR and work duration (as in cyclic sports) also applies to intermittent sports like tennis

  • Aerobic vs Anaerobic Work:

    • Men: 30% of match time is aerobic (HR ≤150 bpm)

    • Women: 20% of match time is aerobic

    • Anaerobic zone (HR >180 bpm): 29% for women, 13% for men

Despite intense work, blood lactate concentrations in tennis are relatively low, which suggests that:

Alactic Anaerobic systems (ATP-CP) are dominant for energy production during rallies.
Recovery and energy replenishment occur primarily during short rest breaks.

Primary Energy Systems Used in Tennis

  • 70% – Alactic Anaerobic System

    • White, fast-twitch (Type IIb) muscle fibers

    • Explosive, quick-fatiguing, strong hypertrophy potential

    • ATP resynthesis via creatine phosphate (CrP)

  • 20% – Lactic Anaerobic System

    • Type II fibers, ATP from glucose/glycogen

  • 10% – Aerobic System

    • Red, slow-twitch (Type I) fibers

    • ATP from glucose, fats, amino acids

ATP Resynthesis Timeline (Alactic recovery during rest):

  • 20 sec – ~50% restored

  • 40 sec – ~75%

  • 60 sec – ~87%

Energy Expenditure

  • Daily caloric demand:

    • Men: 4500–5500 kcal/day

    • Women: 4000–4500 kcal/day

  • 1 hour of tennis ≈ 430 kcal








Conditioning Training – Key Components and Principles

Physical Qualities

  • Endurance: ability to sustain prolonged physical activity

    • Aerobic

    • Anaerobic (lactate and alactate)

    • Muscular endurance

  • Strength: maximum force against resistance

    • Maximal, speed, power, endurance

  • Speed: ability to perform movements in minimal time

    • Reaction, power, endurance

  • Flexibility: joint mobility and muscle elasticity

  • Coordination: synchronization of muscle activity

    • General, hand-eye coordination

  • Balance: ability to maintain equilibrium

    • Static and dynamic

  • Power: maximal effort generated in short time

  • Agility: optimal performance in minimal time

  • Quickness: rapid and efficient change of direction combining speed, flexibility, power, balance, and coordination

Benefits of Conditioning Training

  • Improves overall health

  • Increases training frequency and quality

  • Delays fatigue and accelerates recovery

  • Enhances mental strength and confidence

  • Improves technique and strength

  • Reduces injury risk

Basic Training Principles

  1. Adaptation

  2. Frequency

  3. Intensity

  4. Specificity

  5. Variety

  6. Recovery

Periodization and Planning

  • Develop annual competition calendar

  • Identify key competition periods and peak form (2-3 weeks, 3-5 times per year)

  • Divide training into micro-, meso-, and macrocycles

  • Training phases: preparatory, pre-competition, competition, post-competition (recovery)

  • Work on functional and technical levels to achieve and maintain peak form


Physical Conditioning in Tennis – Harm or Benefit?

Author's viewpoint, published in Forehand magazine, 1997
(In response to statements made by a leading tennis coach at the beginning of my coaching career.)

What is Physical Conditioning and What Does Conditioning Training Involve?

In sports practice, the term physical conditioning has become synonymous with physical fitness—the development and maintenance of the fundamental physical qualities: speed, strength, and endurance. Conditioning training focuses specifically on the systematic development, refinement, and application of these qualities within the context of modern tennis, a sport that demands ever-increasing levels of speed, endurance, and explosiveness.

By incorporating methods from track and field athletics and modern strength and conditioning, many tennis players—both internationally and in Bulgaria—have demonstrated that a significant part of their progress and athletic development is the result of well-structured conditioning programs.

Skepticism Toward Physical Conditioning in Tennis

Despite this, many coaches in Bulgaria remain skeptical and, in practice, dismiss this essential component of player development. They argue that conditioning methods can be completely replaced by exercises performed exclusively on the tennis court in the form of sport-specific practice.

But is this really the case?

A Physiological Perspective: Stress and Adaptation

Every form of sports activity acts as a specific stimulus on the human body. The training effect arises as a response to the stress produced by physical loading. Through this process of biological adaptation, the body gradually increases its level of preparedness and performance capacity.

Conditioning training serves as a non-specific, yet essential training stimulus within the overall preparation of the athlete. When the training process consists solely of tennis-specific practice, the body gradually adapts to that particular stimulus, and the effectiveness of training begins to decline. To generate a complete training stimulus and ensure continued athletic development, it is necessary to introduce a new and different form of loading. This is precisely the role of conditioning training.

Its value extends far beyond simply complementing tennis practice. Conditioning training develops new mechanisms of adaptation to physical load, increases the body's resistance to training stress, supports overall physiological adaptation, and produces long-term functional changes. As a result, athletes improve their work capacity, recovery efficiency, and ability to tolerate greater training and competitive demands.

Conclusion

Physical conditioning deserves its rightful place within the training process alongside tennis-specific practice. Its role is fundamental, particularly during certain phases of the annual training cycle.

Rejecting the need for specialized conditioning in tennis reflects a misunderstanding of modern training concepts and the fundamental principles of contemporary sport science.

Sofia, 1997










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