School of Human Movement and Nutrition Sciences, The University of Queensland, Brisbane, Australia.
Center for Sport Research (CSR), Deakin University, Geelong, Australia; and.
J Strength Cond Res. 2020 Nov;34(11):3190-3198. doi: 10.1519/JSC.0000000000002654.
Hoffmann, SM, Skinner, TL, van Rosendal, SP, Osborne, MA, Emmerton, LM, and Jenkins, DG. The efficacy of the lactate threshold: A sex-based comparison. J Strength Cond Res 34(11): 3190-3198, 2020-The second lactate threshold (LT2) has previously been associated with endurance performance; however, comparisons between sexes are lacking regarding its efficacy. The aim of this study was to compare LT2 between men and women, specifically regarding its (a) relationship with endurance performance and (b) capacity to establish training and competition intensities. Competitive male (mean ± SD: age, 27.7 ± 4.7 years; V[Combining Dot Above]O2max, 59.7 ± 5.2 ml·kg·min; n = 10) and female (mean ± SD: age, 27.3 ± 6.2 years; V[Combining Dot Above]O2max, 54.5 ± 5.3 ml·kg·min; n = 12) cyclists and triathletes completed an incremental cycle trial to volitional fatigue (for determination of V[Combining Dot Above]O2max and LT2 via the modified D-max method), a constant load (±5%) exercise trial of 30 minutes at LT2 power output, and a 40-km cycle time trial. The LT2 significantly correlated with 40-km cycling performance in both men (r = -0.69 to -0.77; p < 0.01-0.05) and women (r = -0.63 to -0.75; p < 0.01-0.05). All men sustained LT2 power output for 30 minutes, compared with 82% of women. Despite LT2 reflecting a similar heart rate, V[Combining Dot Above]O2, and [La] to those elicited during a 40-km time trial in both men and women, power output at LT2 was 6% higher (p < 0.05) than mean time trial power output in women, with no significant difference in men. Based on these findings, sex-specific recommendations have been suggested in regard to the use of LT2 for establishing performance potential, prescribing endurance training intensities and setting 40-km performance intensity.
霍夫曼，SM，斯金纳，TL，范罗森达尔，SP，奥斯本，MA，埃默顿，LM，和詹金斯，DG。乳酸阈的功效：基于性别的比较。J 力量与调节研究 34(11):3190-3198,2020-第二乳酸阈 (LT2) 先前与耐力表现相关；然而，关于其功效，男女之间的比较是缺乏的。本研究的目的是比较男性和女性之间的 LT2，特别是在以下方面：(a) 与耐力表现的关系，以及 (b) 建立训练和比赛强度的能力。竞技男性（平均±标准差：年龄，27.7±4.7 岁；V[Combining Dot Above]O2max，59.7±5.2ml·kg·min；n=10）和女性（平均±标准差：年龄，27.3±6.2 岁；V[Combining Dot Above]O2max，54.5±5.3ml·kg·min；n=12）自行车运动员和铁人三项运动员完成了一项递增循环试验，直到自愿疲劳（通过改良的 D-max 方法确定 V[Combining Dot Above]O2max 和 LT2），在 LT2 功率输出下进行 30 分钟的恒定负荷（±5%）运动试验，以及 40 公里的自行车计时赛。LT2 在男性（r=-0.69 至-0.77；p<0.01-0.05）和女性（r=-0.63 至-0.75；p<0.01-0.05）中均与 40 公里自行车表现显著相关。所有男性都能维持 LT2 功率输出 30 分钟，而女性只有 82%能做到。尽管 LT2 在男性和女性的 40 公里计时赛中反映出相似的心率、V[Combining Dot Above]O2 和 [La]，但 LT2 时的功率输出比女性的平均计时赛功率输出高 6%（p<0.05），男性则没有显著差异。基于这些发现，已经针对使用 LT2 来确定表现潜力、规定耐力训练强度和设定 40 公里表现强度，提出了基于性别的建议。
