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Validity and Reliability of an On-Court Fitness Test for Assessing and Monitoring Aerobic Fitness in Squash

James C, Tenllado Vallejo F, Kantebeen M, Farra S

J Strength Cond Res, 2019 May;33(5):1400-1407.
PMID: 29461414 DOI: 10.1519/JSC.0000000000002465

James, C, Tenllado Vallejo, F, Kantebeen, M, and Farra, S. Validity and reliability of an on-court fitness test for assessing and monitoring aerobic fitness in squash. J Strength Cond Res 33(5): 1400-1407, 2019-Current on-court assessments of aerobic fitness in squash are not designed to yield a wealth of physiological data. Moreover, tests may require complex computer equipment or involve simulated racket strokes, which are difficult to standardize at high intensities. This study investigated the validity and reliability of a squash-specific fitness test which can yield both a standalone performance score, as well as pertinent physiological markers such as V[Combining Dot Above]O2max, the lactate turnpoint and oxygen cost, in a sport-specific environment. Eight national squash players completed 3 tests in a counterbalanced order: an incremental laboratory treadmill test (LAB) and 2 on-court fitness tests (STs) that involved repeated shuttle runs at increasing speeds. V[Combining Dot Above]O2max during ST was agreeable with LAB (typical error [TE] = 3.3 ml·kg·min, r = 0.79). The mean bias between LAB and ST was 2.5 ml·kg·min. There were no differences in maximum heart rate, postexercise blood lactate concentration, or end of test rating of perceived exertion between LAB and ST (p > 0.05). The ST was highly reliable, with 74 (10) laps completed in ST1 and 75 (12) laps in ST2 (mean bias = 1 lap, TE = 3 laps, r = 0.97). Physiological markers were also reliable, including V[Combining Dot Above]O2max, (TE = 1.5 ml·kg·min, r = 0.95), the lap number at 4 mMol (TE = 4 laps, r = 0.77), and average V[Combining Dot Above]O2 across the first 4 stages (TE = 0.94 ml·kg·min, r = 0.95). We observed good agreement between LAB and ST for assessing V[Combining Dot Above]O2max and between both on-court trials for assessing test performance and selected physiological markers. Consequently, we recommend this test for monitoring training adaptations and prescribing individualized training in elite squash players.
A Three Week Unexpected Disturbance Program Improves Physical Performance of Elite Female Athletes

Teichmann J, Suwarganda EK, Beaven CM, Hébert-Losier K, Lee JW, Tenllado Vallejo F, et al.

J Sport Rehabil, 2016 Dec 19.
PMID: 27992260 DOI: 10.1123/jsr.2016-0082

CONTEXT: Sensorimotor training is commonly used in a rehabilitative setting; however, the effectiveness of an unexpected disturbance program (UDP) to enhance performance measures in uninjured elite athletes is unknown.
OBJECTIVE: To assess the impact of a three-week UDP program onstrength, power, and proprioceptive measures.
DESIGN: Matched-group, pre- post design.
SETTING: National Sports Institute.
PARTICIPANTS: Twenty-one international-level female field hockey athletes.
INTERVENTIONS: Two 45 min UDP sessions were incorporated into each week of a three week training program (total 6 sessions).
MAIN OUTCOME MEASURES: One-repetition maximum strength, lower limb power, 20 m running speed, and proprioception tests were performed before and after the experimental period.
RESULTS: Substantial improvements in running sprint speed at 5- (4.4 ± 2.6%; Effect Size [ES]: 0.88), 10- (2.1 ± 1.9%; ES: 0.51), and 20-m (1.0 ± 1.6%; ES: 0.23) were observed in the UDP group. Squat jump performance was also clearly enhanced when compared to the control group (3.1 ± 6.1%; ES: 0.23). Small but clear improvements in maximal strength were observed in both groups.
CONCLUSION: A three week UDP can elicit clear enhancements in running sprint speed and concentric-only jump performance. These improvements are suggestive of enhanced explosive strength and are particularly notable given the elite training status of the cohort and relatively short duration of the intervention. Thus, we would reiterate the statement by Gruber and colleagues (2004) that sensorimotor training is a "highly efficient" modality for improving explosive strength.

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