Page 148 - 《运动与健康科学》(英文)2024年第2期

TaggedAPTARAFigure TaggedAPTARAEnd270 G. Valli et al.

Fig. 3. Swarm plots representing the (A) absolute MUs RT and (B) DERT at the 3 data collection points. From left to right, MUs properties are presented for the 3
different submaximal contraction intensities (i.e., 10% MVC, 25% MVC, and 50% MVC). Individual MUs are represented by dots and clustered by subject.
Summary data are presented as mean § SEM, and the direction of the changes is highlighted by a connection line. Significance levels are: ** p < 0.01, *** p < 0.001.
AR = active recovery; DERT = derecruitment threshold; LS = limb suspension; MUs = motor units; MVC = maximal voluntary isometric contraction; N = Newton;
RT = recruitment threshold; SEM = standard error of the mean.TaggedAPTARAEnd

50% MVC. The DForce RT returned to LS0 at AR21 at 10% between- and within-participants variability of tracked MUs is
MVC but not at 25% MVC (20.10%, p = 0.003).TaggedAPTARAEnd available in Supplementary Fig. 5.TaggedAPTARAEnd

TaggedAPTARAP3.4.4. Pool of tracked MUsTaggedAPTARAEnd
TaggedAPTARAPAbsolute RT (Fig. 6A) was reduced at LS10 compared to TaggedAPTARAH23.5. Summary of MUs propertiesTaggedAPTARAEnd
LS0 (24.95%, p = 0.017 for lower-threshold and 21.17%, TaggedAPTARAPIn the total pool of MUs, absolute RT and DERT were
p = 0.003 for higher-threshold MUs) and returned to the LS0 reduced at LS10 at all contraction intensities and recovered to
values at AR21. The same trend was observed for DERT baseline levels at AR21. In contrast, MUs DR was reduced at
(31.55%, p = 0.003 for lower-threshold and 29.48%, p < LS10 but only at 10% and 25% MVC while, at 50% MVC, DR
0.001 for higher-threshold MUs) (Fig. 6C). Neither the relative increased compared to LS0. At AR21, DR returned to baseline
RT and DERT of the tracked MUs (Fig. 6B and 6D) differed at levels at 50% MVC while it exceeded the baseline levels at
10% and 25% MVC. The changes in MUs absolute RT,
any measurement.TaggedAPTARAEnd
TaggedAPTARAPComparing LS10 with LS0, DR at recruitment (8.86%, DERT, and DR were confirmed in the pool of tracked MUs.TaggedAPTARAEnd
p = 0.051; Fig. 6E) and during the steady-state phase (7.27%, TaggedAPTARAPAt LS10, relative RT was increased at 10% and 25% but not
p = 0.057; Fig. 6G) approached the borderline of a significant at 50% MVC. At AR21, it recovered to baseline levels at 10%
reduction for lower-threshold but not for higher-threshold but not at 25% MVC. Relative RT did not change in the pool
MUs that did not change. DR at derecruitment was not affected of tracked MUs.TaggedAPTARAEnd
by the interventions (Fig. 6F). For both lower- and higher- TaggedAPTARAPThe ranges of DR (DDR RT ) and force modulation
threshold MUs, ΔDR RT was not affected by the intervention (DForce RT ) were reduced at LS10 compared to LS0 at 10%
(Supplementary Fig. 4A). A visual representation of the and 25% but not at 50% MVC. At both 10% and 25% MVC,