ACTIN Health & Rehabilitation, Inc, Vancouver, BC, Canada.
J Athl Train. 2011 Jul-Aug;46(4):395-402. doi: 10.4085/1062-6050-46.4.395.
Knee braces were introduced in sports approximately 30 years ago. However, the effects of a functional knee brace (FKB) on aerobic and anaerobic performance after fatigue are unknown.
To investigate whether FKB use in noninjured participants hindered performance during aerobic (Léger beep test) and anaerobic (repeated high-intensity shuttle test [RHIST]) tasks.
Crossover study.
Laboratory.
Twenty-seven healthy male provincial and national basketball and field hockey athletes (age = 19.4±3.0 years, range, 17-26 years; height = 182.6±6.8 cm, range, 168-196 cm; mass = 80.0±9.1 kg, range, 66-108 kg).
INTERVENTION(S): Each participant was provided a custom-fitted FKB and performed 5 nonbraced (NBR) testing sessions over 3 days, followed by 5 braced (BR) testing sessions over 3 days, for a total of 17.5 hours of testing per condition. During each testing session, participants performed 1 trial of the Léger beep test and 1 trial of the RHIST in each condition.
MAIN OUTCOME MEASURE(S): Predicted maximal oxygen consumption (Vo(2) max) and time performance measures were recorded for each NBR and BR trial.
Initial performance levels were lower for BR than NBR for both the Léger beep test (BR = 44.3 mL/kg/min, NBR = 47.3 mL/kg/min; F(1,26) = 8.726; P = .007) and the RHIST (BR = 16.5 seconds, NBR = 16.2 seconds; F(1,26) = 13.98, P = .001). However, with continued FKB use, the aerobic performance measure remained higher for only the first 2 BR testing sessions (NBR = 46.9 mL/kg/min, BR = 42.4 mL/kg/min; F(3.0,79.8) = 4.95, P = .003). For the anaerobic test, no performance difference was noted between the testing conditions (NBR = 16.2 seconds, BR = 16.4 seconds; P = .7), whereas fatigue levels were lower during BR testing sessions (NBR = 33%, BR = 31%). After 14.0 hours of FKB use, performance levels were almost equal between the testing conditions (NBR = 47.6 mL/kg/min, BR = 46.1 mL/kg/min).
We found an initial decrement in performance when the FKB was used during an aerobic or anaerobic task. However, after 14.0 hours of FKB use, accommodation to the FKB was possible.
大约 30 年前，膝关节支具被引入运动领域。然而，功能性膝关节支具（FKB）对疲劳后有氧和无氧表现的影响尚不清楚。
研究在非受伤参与者中使用 FKB 是否会妨碍有氧（Léger 哔哔声测试）和无氧（重复高强度穿梭测试 [RHIST]）任务中的表现。
交叉研究。
实验室。
27 名健康的省级和国家级篮球和曲棍球运动员（年龄=19.4±3.0 岁，范围，17-26 岁；身高=182.6±6.8cm，范围，168-196cm；体重=80.0±9.1kg，范围，66-108kg）。
每位参与者都获得了定制的 FKB，并在 3 天内进行了 5 次不戴支具（NBR）测试，然后在 3 天内进行了 5 次戴支具（BR）测试，每个条件共进行了 17.5 小时的测试。在每个测试会话中，参与者在每个条件下进行了 1 次 Léger 哔哔声测试和 1 次 RHIST 测试。
记录了每个 NBR 和 BR 试验的预测最大耗氧量（Vo(2) max）和时间表现测量值。
BR 初始表现水平低于 NBR，无论是 Léger 哔哔声测试（BR=44.3mL/kg/min，NBR=47.3mL/kg/min；F(1,26)=8.726；P=.007）还是 RHIST（BR=16.5 秒，NBR=16.2 秒；F(1,26)=13.98，P=.001）。然而，随着 FKB 的持续使用，仅在前 2 次 BR 测试中，有氧表现测量值仍然更高（NBR=46.9mL/kg/min，BR=42.4mL/kg/min；F(3.0,79.8)=4.95，P=.003）。对于无氧测试，测试条件之间没有注意到表现差异（NBR=16.2 秒，BR=16.4 秒；P=.7），而 BR 测试期间疲劳水平较低（NBR=33%，BR=31%）。在使用 FKB 14.0 小时后，测试条件之间的表现水平几乎相等（NBR=47.6mL/kg/min，BR=46.1mL/kg/min）。
我们发现，当在有氧或无氧任务中使用 FKB 时，最初的表现会下降。然而，在使用 FKB 14.0 小时后，对 FKB 的适应是可能的。
