Micheli Lorenzo, Lucertini Francesco, Grossi Tommaso, Pogliaghi Silvia, Keir Daniel A, Ferri Marini Carlo
Department of Biomolecular Sciences - Division of Exercise and Health Sciences, University of Urbino Carlo Bo, Urbino, Marche, Italy.
Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Veneto, Italy.
PeerJ. 2025 Mar 18;13:e19060. doi: 10.7717/peerj.19060. eCollection 2025.
Identifying the boundary between heavy and severe exercise domains is crucial since it demarcates the transition from sustainable to unsustainable exercise. This systematic review aimed to determine differences and agreement between two indices used to determine this boundary, namely critical power (CP) and maximal lactate steady state (MLSS), and how moderators may affect these differences. Ten out of 782 studies found were included in the meta analyses. Random effect meta-analyses were performed to evaluate the mean differences (MD) between CP and MLSS, and moderators' effect on MD was assessed using meta-regression. CP and MLSS agreement was tested using Bland-Altman meta-analyses on the limits of agreements (LoA) of the MD. Power output (PO) at CP was higher (MD (95% LoA) = 12.42 [-19.23; 44.08] W, = 0.005) than PO at MLSS, with no differences between CP and MLSS in terms of oxygen uptake (MD (95% LoA) = 0.09 [-0.34; 0.52] L⋅min, = 0.097), heart rate (MD (95% LoA) = 0.61 [-15.84; 17.05] bpm, = 0.784), and blood lactate concentration (MD (95% LoA) = 1.63 [-2.85; 6.11] mM, = 0.240). Intensities at CP ( = 0.002) and MLSS ( = 0.010) influenced the MD expressed in W. In conclusion, solely when expressed in PO, CP was higher than MLSS, with larger differences in fitter and younger individuals, emphasizing the possible effect of the indicators used for assessing exercise intensity. Finally, the high interindividual variability observed in the differences between CP and MLSS could compromise their interchangeability in predicting the heavy to severe boundary regardless of the parameter used to assess exercise intensity.
确定重度和极重度运动领域之间的界限至关重要，因为它划分了从可持续运动到不可持续运动的转变。本系统评价旨在确定用于确定此界限的两个指标，即临界功率（CP）和最大乳酸稳态（MLSS）之间的差异和一致性，以及调节因素如何影响这些差异。在检索到的782项研究中，有10项纳入了荟萃分析。进行随机效应荟萃分析以评估CP和MLSS之间的平均差异（MD），并使用元回归评估调节因素对MD的影响。使用Bland-Altman荟萃分析对MD的一致性界限（LoA）测试CP和MLSS的一致性。CP时的功率输出（PO）高于MLSS时的PO（MD（95%LoA）=12.42[-19.23；44.08]W，P = 0.005），而在摄氧量（MD（95%LoA）=0.09[-0.34；0.52]L·min，P = 0.097）、心率（MD（95%LoA）=0.61[-15.84；17.05]次/分钟，P = 0.784）和血乳酸浓度（MD（95%LoA）=1.63[-2.85；6.11]mM，P = 0.240）方面，CP和MLSS之间没有差异。CP（P = 0.002）和MLSS（P = 0.010）时的强度影响以W表示的MD。总之，仅当以PO表示时，CP高于MLSS，在身体状况较好和较年轻的个体中差异更大，强调了用于评估运动强度的指标的可能影响。最后，在CP和MLSS之间的差异中观察到的高个体间变异性可能会损害它们在预测重度到极重度界限时的互换性，无论用于评估运动强度的参数如何。
