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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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ASSESSING INTER-EFFORT RECOVERY AND CHANGE OF DIRECTION ABILITY WITH THE 30-15 INTERMITTENT FITNESS TEST |
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Bachar Haydar1, Hani Al Haddad1,2, Said Ahmaidi1 and Martin Buchheit1,2  |
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1EA-3300: Laboratory of Exercise Physiology and Rehabilitation, Faculty of Sport Sciences, University of Picardie, Jules Verne, Amiens, France, 2Physiology Unit, Sport Science Department, Aspire, Academy for Sports Excellence, Doha, Qatar |
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© Journal of Sports Science and Medicine (2011) 10, 346 - 354 |
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| ABSTRACT | |||
| The aim of the present study was to propose a new and simple field
assessment of inter-effort recovery and change of direction (COD) ability
based on performance during the 30-15 Intermittent Fitness Test (30-15IFT,
an intermittent, incremental shuttle-run test) using three different protocols.
Forty team-sport players (22 ± 2 years) performed either (group A; n = 16)
the original 30-15IFT and two modified versions, one without a rest period
(i.e. continuous run, 30-15IFT-CONT) and one without COD (30-15IFT-LINE),
or (group B; n = 24) the original 30-15IFT and a modified version with more
COD (28-m shuttle instead of 40-m, 30- 15IFT-28m). Heart rate (HR), blood
lactate concentration ([La]b), rating of perceived exertion (RPE) and maximal
running speed were recorded for all tests. There was no statistical difference
in either maximal HR (A: p = 0.07 and B: p = 0.94) or RPE (A: p = 0.10 and
B: p = 0.97) between tests. Compared with the 30-15IFT (12.3 ± 2.5, p <
0.01) and 30-15IFT-LINE (11.3 ± 2.6, p = 0.07, ES = 0.61), [La]b was lower
for 30-15IFT-CONT (9.6 ± 3.3 mmol.L-1). Compared with 30-15IFT, maximal
running speed was higher for 30-15IFT-LINE (103.1 ± 1.7%, p < 0.001)
and lower for 30-15IFT-CONT (93.2 ± 1.4%, p < 0.001), while it was similar
for 30-15IFT-28m (99.7 ± 3.6%, p = 0.62). Maximal speeds reached after the
four tests were significantly but not perfectly correlated (r = 0.74 to
95, all p < 0.001). Present results show that differences in the maximal
running speed reached following different versions of the 30-15IFT can be
used by coaches to isolate and evaluate inter- effort recovery (i.e. 30-15IFT
vs. 30-15IFT-CONT) and COD (i.e., 30-15IFT vs. 30-15IFT-LINE) abilities
in the field. Additionally, COD ability as evaluated here appears to be
independent of shuttle-length. Key words: High-intensity running, agility, intermittent exercise, field test, HR/speed relationship. |
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