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W' recovery kinetics following exhaustion : a two-phase exponential process influenced by aerobic fitness

Kevin Caen (UGent) , Gil Bourgois (UGent) , Charles Dauwe (UGent) , Laura Blancquaert (UGent) , Kobe Vermeire (UGent) , Eline Lievens (UGent) , Jo Van Dorpe (UGent) , Wim Derave (UGent) , Jan Bourgois (UGent) , Lauren Pringels (UGent) , et al.
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Abstract
Purpose: The aims of this study were 1) to model the temporal profile of W' recovery after exhaustion, 2) to estimate the contribution of changing (V) over dotO(2) kinetics to this recovery, and 3) to examine associations with aerobic fitness and muscle fiber type (MFT) distribution. Methods: Twenty-one men (age = 25 +/- 2 yr, (V) over dotO(2peak) = 54.4 +/- 5.3 mL.min(-1).kg(-1)) performed several constant load tests to determine critical power and W' followed by eight trials to quantify W' recovery. Each test consisted of two identical exhaustive work bouts (WB1 and WB2), separated by a variable recovery interval of 30, 60, 120, 180, 240, 300, 600, or 900 s. Gas exchange was measured and muscle biopsies were collected to determine MFT distribution. W' recovery was quantified as observed W' recovery (W'(OBS)), model-predicted W' recovery (W'(BAL)), and W' recovery corrected for changing (V) over dotO(2) kinetics (W'(ADJ)). W'(OBS) and W'(ADJ) were modeled using mono- and biexponential fitting. Root-mean-square error (RMSE) and Akaike information criterion (increment AIC(C)) were used to evaluate the models' accuracy. Results: The W'(BAL) model (tau = 524 +/- 41 s) was associated with an RMSE of 18.6% in fitting W'(OBS) and underestimated W' recovery for all durations below 5 min (P < 0.002). Monoexponential modeling of W'(OBS) resulted in tau = 104 s with RMSE = 6.4%. Biexponential modeling of W'(OBS) resulted in tau(1) = 11 s and tau(2) = 256 s with RMSE = 1.7%. W'(ADJ) was 11% +/- 1.5% lower than W'(OBS) (P < 0.001). increment AIC(C) scores favored the biexponential model for W'(OBS), but not for W'(ADJ). (V) over dotO(2peak) (P = 0.009) but not MFT distribution (P = 0.303) was associated with W'(OBS). Conclusion: We showed that W' recovery from exhaustion follows a two-phase exponential time course that is dependent on aerobic fitness. The appearance of a fast initial recovery phase was attributed to an enhanced aerobic energy provision resulting from changes in (V) over dotO(2) kinetics.
Keywords
Physical Therapy, Sports Therapy and Rehabilitation, Orthopedics and Sports Medicine

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MLA
Caen, Kevin, et al. “W’ Recovery Kinetics Following Exhaustion : A Two-Phase Exponential Process Influenced by Aerobic Fitness.” MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, vol. 53, no. 9, 2021, pp. 1911–21, doi:10.1249/mss.0000000000002673.
APA
Caen, K., Bourgois, G., Dauwe, C., Blancquaert, L., Vermeire, K., Lievens, E., … Boone, J. (2021). W’ recovery kinetics following exhaustion : a two-phase exponential process influenced by aerobic fitness. MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 53(9), 1911–1921. https://doi.org/10.1249/mss.0000000000002673
Chicago author-date
Caen, Kevin, Gil Bourgois, Charles Dauwe, Laura Blancquaert, Kobe Vermeire, Eline Lievens, Jo Van Dorpe, et al. 2021. “W’ Recovery Kinetics Following Exhaustion : A Two-Phase Exponential Process Influenced by Aerobic Fitness.” MEDICINE AND SCIENCE IN SPORTS AND EXERCISE 53 (9): 1911–21. https://doi.org/10.1249/mss.0000000000002673.
Chicago author-date (all authors)
Caen, Kevin, Gil Bourgois, Charles Dauwe, Laura Blancquaert, Kobe Vermeire, Eline Lievens, Jo Van Dorpe, Wim Derave, Jan Bourgois, Lauren Pringels, and Jan Boone. 2021. “W’ Recovery Kinetics Following Exhaustion : A Two-Phase Exponential Process Influenced by Aerobic Fitness.” MEDICINE AND SCIENCE IN SPORTS AND EXERCISE 53 (9): 1911–1921. doi:10.1249/mss.0000000000002673.
Vancouver
1.
Caen K, Bourgois G, Dauwe C, Blancquaert L, Vermeire K, Lievens E, et al. W’ recovery kinetics following exhaustion : a two-phase exponential process influenced by aerobic fitness. MEDICINE AND SCIENCE IN SPORTS AND EXERCISE. 2021;53(9):1911–21.
IEEE
[1]
K. Caen et al., “W’ recovery kinetics following exhaustion : a two-phase exponential process influenced by aerobic fitness,” MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, vol. 53, no. 9, pp. 1911–1921, 2021.
@article{8703141,
  abstract     = {{Purpose: The aims of this study were 1) to model the temporal profile of W' recovery after exhaustion, 2) to estimate the contribution of changing (V) over dotO(2) kinetics to this recovery, and 3) to examine associations with aerobic fitness and muscle fiber type (MFT) distribution. Methods: Twenty-one men (age = 25 +/- 2 yr, (V) over dotO(2peak) = 54.4 +/- 5.3 mL.min(-1).kg(-1)) performed several constant load tests to determine critical power and W' followed by eight trials to quantify W' recovery. Each test consisted of two identical exhaustive work bouts (WB1 and WB2), separated by a variable recovery interval of 30, 60, 120, 180, 240, 300, 600, or 900 s. Gas exchange was measured and muscle biopsies were collected to determine MFT distribution. W' recovery was quantified as observed W' recovery (W'(OBS)), model-predicted W' recovery (W'(BAL)), and W' recovery corrected for changing (V) over dotO(2) kinetics (W'(ADJ)). W'(OBS) and W'(ADJ) were modeled using mono- and biexponential fitting. Root-mean-square error (RMSE) and Akaike information criterion (increment AIC(C)) were used to evaluate the models' accuracy. Results: The W'(BAL) model (tau = 524 +/- 41 s) was associated with an RMSE of 18.6% in fitting W'(OBS) and underestimated W' recovery for all durations below 5 min (P < 0.002). Monoexponential modeling of W'(OBS) resulted in tau = 104 s with RMSE = 6.4%. Biexponential modeling of W'(OBS) resulted in tau(1) = 11 s and tau(2) = 256 s with RMSE = 1.7%. W'(ADJ) was 11% +/- 1.5% lower than W'(OBS) (P < 0.001). increment AIC(C) scores favored the biexponential model for W'(OBS), but not for W'(ADJ). (V) over dotO(2peak) (P = 0.009) but not MFT distribution (P = 0.303) was associated with W'(OBS). Conclusion: We showed that W' recovery from exhaustion follows a two-phase exponential time course that is dependent on aerobic fitness. The appearance of a fast initial recovery phase was attributed to an enhanced aerobic energy provision resulting from changes in (V) over dotO(2) kinetics.}},
  author       = {{Caen, Kevin and Bourgois, Gil and Dauwe, Charles and Blancquaert, Laura and Vermeire, Kobe and Lievens, Eline and Van Dorpe, Jo and Derave, Wim and Bourgois, Jan and Pringels, Lauren and Boone, Jan}},
  issn         = {{0195-9131}},
  journal      = {{MEDICINE AND SCIENCE IN SPORTS AND EXERCISE}},
  keywords     = {{Physical Therapy,Sports Therapy and Rehabilitation,Orthopedics and Sports Medicine}},
  language     = {{eng}},
  number       = {{9}},
  pages        = {{1911--1921}},
  title        = {{W' recovery kinetics following exhaustion : a two-phase exponential process influenced by aerobic fitness}},
  url          = {{http://dx.doi.org/10.1249/mss.0000000000002673}},
  volume       = {{53}},
  year         = {{2021}},
}

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