Rivière Jean Romain, Peyrot Nicolas, Cross Matthew R, Messonnier Laurent A, Samozino Pierre
Univ Savoie Mont Blanc, Laboratoire Interuniversitaire de Biologie de la Motricité, EA 7424, Chambéry, France.
Le Mans Université, Movement-Interactions-Performance, MIP, EA 4334, Le Mans, France.
Front Physiol. 2020 Oct 9;11:576725. doi: 10.3389/fphys.2020.576725. eCollection 2020.
Strength-endurance mainly depends on the power output, which is often expressed relative to the individual's maximal power capability ( ). However, an individual can develop the same power, but in different combinations of force and velocity (force-velocity condition). Also, at matched power output, changing the force-velocity condition results in a change of the velocity-specific relative power ( ), associated with a change in the power reserve. So far, the effect of these changing conditions on strength-endurance remains unclear.
We aimed to test the effects of force-velocity condition and power output on strength-endurance.
Fourteen sportsmen performed (i) force- and power-velocity relationships evaluation in squat jumps and (ii) strength-endurance evaluations during repeated squat jump tests in 10 different force-velocity-power conditions, individualized based on the force- and power-velocity relationships. Each condition was characterized by different (i) relative power (% ), (ii) velocity-specific relative power (% ), and (iii) ratio between force and velocity ( ). Strength-endurance was assessed by the maximum repetitions ( ), and the cumulated mechanical work ( ) performed until exhaustion during repeated squat jump tests. Intra and inter-day reliability of were tested in one of the 10 conditions. The effects of % , % , and on and were tested via stepwise multiple linear regressions and two-way ANOVAs.
exhibited almost perfect intra- and inter-day reliability (ICC=0.94 and 0.92, respectively). and were influenced by % and ( = 0.975 and 0.971; RSME=0.243 and 0.234, respectively; both < 0.001), with the effect of increasing with decreasing % (interaction effect, = 0.03). % was not considered as a significant predictor of strength-endurance by the multiple regressions analysis. and were higher at lower % and in low force-high velocity conditions (i.e., lower ).
Strength-endurance was almost fully dependent on the position of the exercise conditions relative to the individual force-velocity and power-velocity relationships (characterized by % and ). Thus, the standardization of the force-velocity condition and the velocity-specific relative power should not be overlooked for strength-endurance testing and training, but also when setting fatiguing protocols.
力量耐力主要取决于功率输出，功率输出通常相对于个体的最大功率能力来表示（ ）。然而，个体可以产生相同的功率，但力和速度的组合不同（力-速度条件）。此外，在匹配的功率输出下，改变力-速度条件会导致特定速度相对功率（ ）的变化，这与功率储备的变化相关。到目前为止，这些变化条件对力量耐力的影响尚不清楚。
我们旨在测试力-速度条件和功率输出对力量耐力的影响。
14名运动员进行了（i）深蹲跳中的力与功率-速度关系评估，以及（ii）在10种不同的力-速度-功率条件下进行重复深蹲跳测试时的力量耐力评估，这些条件是根据力与功率-速度关系进行个体化设定的。每个条件的特征在于不同的（i）相对功率（% ）、（ii）特定速度相对功率（% ）和（iii）力与速度之比（ ）。通过重复深蹲跳测试中直到疲劳的最大重复次数（ ）和累积机械功（ ）来评估力量耐力。在10种条件之一中测试了 的日内和日间可靠性。通过逐步多元线性回归和双向方差分析测试了% 、% 和 对 和 的影响。
显示出几乎完美的日内和日间可靠性（ICC分别为0.94和0.92）。 和 受% 和 的影响（ 分别为0.975和0.971；RSME分别为0.243和0.234；两者均 < 0.001），随着% 的降低， 的影响增加（交互作用， = 0.03）。多元回归分析未将% 视为力量耐力的显著预测因子。在较低的% 和低力-高速度条件下（即较低的 ）， 和 更高。
力量耐力几乎完全取决于运动条件相对于个体力-速度和功率-速度关系的位置（以% 和 为特征）。因此，在进行力量耐力测试和训练时，以及设定疲劳方案时，不应忽视力-速度条件和特定速度相对功率的标准化。
