Keeping Our Jr Players Fit & Injury-Free

Summary

Lisa Stone interviews Dr. Mark Kovacs, founder of the Kovacs Institute and International Tennis Performance Association (ITPA), on injury prevention, fitness, hydration, sleep, and periodization for junior tennis players. Kovacs brings extensive credentials spanning USTA sports science, Gatorade Sports Science Institute, Cleveland Cavaliers, and working with pro athletes across multiple sports. The episode provides deeply practical, science-backed advice for tennis families on protecting growing athletes from injury while maintaining competitive readiness.

Guest Background

• Dr. Mark Kovacs: Former ITF junior circuit player (Australia), played doubles with Andy Roddick at US Open Juniors. NCAA doubles champion at Auburn. PhD in physiology. Former head of sports science and coaching education at USTA (Boca Raton, 5 years). Worked at Gatorade Sports Science Institute (Brazil national soccer team, NFL QBs, MLB, Ironman). Two seasons with Cleveland Cavaliers (sports science/health). Founded ITPA (International Tennis Performance Association) — certifies trainers/PTs/coaches in 40+ countries. Runs Kovacs Institute in Atlanta (pro athletes in tennis, soccer, baseball, golf).

Key Topics

Injury Prevention Priority Order

1. Aerobic conditioning (#1): Reduce fatigue = reduce injury risk. “If you don’t have work capacity, everything else we talk about is secondary.” Use low-impact cross-training (bike, VersaClimber) to supplement tennis.
2. Lower back (L4/L5/S1): Biggest injury risk during growth. Volume and technique (especially poor serve mechanics) are the two major risk factors. Core and glute training are essential.
3. Shoulder and elbow: Increasingly appearing at 12-14 (was previously 15+). Driven by technique, volume, and equipment tinkering — juniors using adult racket models, customizing strings/weights at 9-12 years old.
4. Knees: Growth-related (Osgood-Schlatter’s, patellar tendonitis). Often resolves with time but requires volume reduction (30% cut recommended at first signs of discomfort).

Three-Level Pain Framework

• Discomfort: Daily niggles, doesn’t prevent practice. Address underlying causes (sleep, nutrition, hormones). Ask: “How’s the body feel? What are you noticing?”
• Pain: Hurts every time you hit; not normal. Must be addressed.
• Injury: Diagnosed tear/fracture. Requires significant treatment and structured return.

Periodization

• Minimum 4 one-month blocks per year without tournament play — for rest, training, skill building, family time.
• Three-tier tournament system: Tier 1 (Nationals — peak for), Tier 2 (Regionals — play well, don’t reduce volume much), Tier 3 (local events — treat as practice matches, train through).
• Review plan quarterly, adjust weekly. Mirrors pro scheduling (Grand Slams = Tier 1, Masters = Tier 2, 250s/500s = Tier 3).

Hydration

• Most players sweat 1-1.5 liters/hour; body can only absorb ~1.5L/hour max. Heavy sweaters are always in deficit.
• Sodium needs: 500-1,000mg/hour for most; some need 1,500-2,000mg. Don’t copy others’ strategies.
• Pre-hydration (night before, morning of) is critical — can’t catch up during match.
• Cramping has 12+ contributing factors — not just hydration. Competitive anxiety causing muscle tension is a major overlooked factor.
• Gatorade sweat patches for at-home sodium testing. Weigh before/after practice for sweat rate.

Sleep

• Sleep quality matters more than just sleep time. Wearables (Whoop, Oura) give trends, not precise nightly data — don’t let athletes see bad readings that ruin their mindset.
• Travel sleep tips: bring your own pillow, use blackout shades, set room colder than you think, use noise-canceling headphones and sleep masks (Therabody recommended).
• On planes: sleep is the best use of flight time. Blue-blocking glasses + neck pillow + sleep mask create a cocoon.

Under-Training (Emerging Concern)

• Kovacs sees more under-training now than 10-15 years ago. Practice intensity is often far below match intensity.
• Simple test: can you run 3 miles in 20 minutes? If not, aerobic base is insufficient for competitive matches.
• Signs: can’t last a 3-set match, visually slowing down in drills, fatigue-driven errors.

Actionable Advice for Families

1. Build aerobic conditioning first — it’s the foundation that reduces injury risk everywhere else
2. 30% volume reduction at first sign of discomfort (pain scale 1-4); if symptoms persist after 1-2 weeks, see a professional
3. Don’t tinker with equipment before 15-16 — adult racket models on growing bodies cause shoulder/elbow problems
4. Schedule 4+ one-month blocks per year without tournaments — use for rest, training, family time
5. Pre-hydrate the night before and morning of matches — you can’t catch up during play
6. Travel with your own pillow — the single simplest sleep improvement for tournament travel
7. Ask “How’s the body feel?” not “Does anything hurt?” — teaches athletes to self-report without creating anxiety
8. Use the 3-mile / 20-minute test as a baseline aerobic fitness check

INTENNSE Relevance

• The INTENNSE 10-minute format creates match-level intensity in a controlled time frame, addressing the gap Kovacs identifies between practice intensity and match intensity.
• INTENNSE events are short enough to serve as Tier 3 competitive exposure without the volume/fatigue concerns of multi-day tournaments.
• Kovacs’s emphasis on periodization supports INTENNSE’s potential role in a player’s calendar — high-intensity bursts that don’t require week-long tournament commitments.
• The ITPA certification network could be a partnership channel for INTENNSE player wellness programming.

Notable Quotes

“Number one is actually get in really good endurance shape because that is one that sometimes doesn’t get talked about enough. The number one thing that can help people reduce the likelihood of injury is to reduce fatigue.” — Dr. Mark Kovacs

“If the player is hoping that it’s going to rain, that’s a big one. If they’re looking forward to not practicing, that’s a real concern typically.” — Dr. Mark Kovacs on signs of overtraining

“I always discuss this. Is it discomfort? Is it pain? Or is it truly an injury? There are really three levels.” — Dr. Mark Kovacs on teaching athletes to communicate about their bodies