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The Reconstitution of W′ Depends on Both Work and Recovery Characteristics

CAEN, KEVIN1,2; BOURGOIS, JAN G.1,2; BOURGOIS, GIL1; VAN DER STEDE, THIBAUX1; VERMEIRE, KOBE1; BOONE, JAN1,2

Medicine & Science in Sports & Exercise: August 2019 - Volume 51 - Issue 8 - p 1745–1751
doi: 10.1249/MSS.0000000000001968
APPLIED SCIENCES
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Purpose This study aimed to investigate the effects of different work and recovery characteristics on the Wreconstitution and to test the predictive capabilities of the WBAL model.

Methods Eleven male participants (22 ± 3 yr, 55 ± 4 mL·kg−1⋅min−1) completed three to five constant work rate tests to determine CP and W′. Subsequently, subjects performed 12 experimental trials, each comprising two exhaustive constant work rate bouts (i.e., WB1 and WB2), interspersed by an active recovery interval. In each trial, work bout characteristics (P4 or P8, i.e., the work rate predicted to result in exhaustion in 4 and 8 min, respectively), recovery work rate (33% CP or 66% CP), and recovery duration (2, 4, or 6 min) were varied. Actual (WACT) and model-predicted (WPRED) reconstitution values of W′ were calculated.

Results After 2, 4, and 6 min recovery, WACT averaged 46% ± 2.7%, 51.2% ± 3.3%, and 59.4% ± 4.1%, respectively (P = 0.003). WACT was 9.4% higher after recovery at 33% CP than at 66% CP (56.9% ± 3.9% vs 47.5% ± 3.2%) (P = 0.019). P4 exercise yielded a 11.3% higher WACT than P8 exercise (57.8% ± 3.9% vs 46.5% ± 2.7%) (P = 0.001). WACT was higher than WPRED in the conditions P4-2 min (+29.7%), P4-4 min (+18.4%), and P8-2 min (+18%) (P < 0.01). A strong correlation (R = 0.68) between the rate of W′ depletion and Wrecovery was found (P = 0.001).

Conclusion This study demonstrated that both the work and recovery characteristics of a prior exhaustive exercise bout can affect the Wreconstitution. Results revealed a slower Wreconstitution when the rate of W′ depletion was slower as well. Furthermore, it was shown that the current WBAL model underestimates actual Wreconstitution, especially after shorter recovery.

1Department of Movement and Sport Sciences, Ghent University, Ghent, BELGIUM; and

2Center of Sports Medicine, Ghent University Hospital, Ghent, BELGIUM

Address for correspondence: Jan Boone, Ph.D., Watersportlaan 2, 9000 Ghent, Belgium; E-mail: Jan.Boone@UGent.be.

Submitted for publication August 2018.

Accepted for publication February 2019.

Online date: March 1, 2019

© 2019 American College of Sports Medicine