REF-616 · Girard, Chevalier, Habrard, Sciberras, Hot & Millet, 2007 · Journal of Strength and Conditioning Research, · Paper
Elite squash is a high-intensity aerobic activity with heavy anaerobic involvement
7 world-class players averaged 86% VO₂max, 92% HRmax and 8.3 mmol/L lactate across simulated games, with 70% effective playing time
Participants
n=7 elite male squash players ranked 1–25 in their national federation, including the world number 1.
Protocol
Squash-specific incremental test to exhaustion, then 3 squash games simulating competition; pulmonary gas exchange, HR and blood lactate by portable analysers; energy expenditure by indirect calorimetry; temporal structure from video.
Key Findings
Mean during play: VO₂ 54.4 ± 4.8 ml·kg⁻¹·min⁻¹ = 86 ± 9% of VO₂max; HR 177 ± 10 bpm = 92 ± 3% of HRmax; energy expenditure 4,933 ± 620 kJ/h; lactate 8.3 ± 3.4 mmol/L.
Time spent above 90% of VO₂max was 24 ± 29% of match duration, above 90% HRmax 69 ± 18%; lactate correlated with time above 90% VO₂max (R = 0.87).
Mean rally 18.6 ± 4.6 s (34.6% of rallies <10 s, 32.6% >21 s); effective playing time 69.7 ± 4.7% — the densest of the racket sports in this base (badminton 31%, REF-615).
Authors' conclusion: world-standard squash is predominantly a high-intensity aerobic activity with great emphasis on the anaerobic energy systems and high uncertainty in the course of play; HR, rally duration and lactate are the controllable variables for prescribing conditioning.
Practical Application
In 7 elite players, simulated squash sat at 86% VO₂max and 92% HRmax on average, with 69% of match time above 90% HRmax, lactate 8.3 mmol/L and 70% effective playing time — so, unlike tennis, the aerobic base is non-negotiable and must be paired with repeated high-lactate tolerance, not just short-sprint work.
Not from this paper; the base's own practice: threshold/VO₂ intervals (e.g. 30-15, 4×4) paired with reactive ghosting drills to reproduce the near-threshold density.
Multidirectional deceleration/agility in confined space (lunge strength, hip/ankle eccentric control) (not from this paper; the base's own practice).
Manage density, not just volume — 70% effective play means short rests accumulate fatigue faster than match duration implies; monitor HR and rally duration, as the authors suggest.
Limitations
Small elite descriptive study (n=7, male); simulated rather than tournament games; no control/intervention; recreational squash lower absolute intensity; means vary with format/opponent.
How this entry was checked and changed
Why this level
(small elite cohort)
Content correction 2026-09-27
"VO₂ ~70–80% VO₂peak" -> 86 ± 9% VO₂max; "mean HR ≈ 90%" -> 92 ± 3%; "moderate-high lactate" -> 8.3 ± 3.4 mmol/L; "work:rest ~1:1" removed -> effective playing time 69.7%, mean rally 18.6 s.
Added Participants (n=7, elite) and Protocol; the entry carried no n. House interval prescriptions labelled as the base's own practice.