Chronic workload has taken many forms over the past decades. In baseball, most think of 长期工作量 as a total inning count over a season. With the advent of ASMI’s 十年青年学习, 长期工作量 also took the form of “总竞争月份”在一个日历年中，连续9个多月参加比赛的投手遭受长期过度使用伤害的风险较高。
但是，随着可穿戴技术的发展，出现了新的工作量度量范式。它始于GPS数据，一些同行的评论来自 Tim Gabbett博士.
Defined as a 28-day average of time spent running at high velocity, a new objective form of 长期工作量 was created. Fused with rich injury data associated with each athletic exposure, Tim Gabbett博士’s research found that players with the highest 长期工作量s had the lowest number of injuries. It’s a very intuitive finding- the more fit a body is, the more it can tolerate during competition. This is to say that 长期工作量 creates resilience to fatigue and creates capacity, or stamina.
At Motus, these measures of acute and 长期工作量s have been applied to the elbow joint. Instead of computing daily load as “高速运转的时间”, Motus first computes daily workload as the total valgus torque from all throws in a day. Next, 长期工作量 is calculated as a 28-day rolling average of daily workload.
根据Motus数据库中典型的高中投手的长期工作量分析，该投手对于11月和12月的任何量的竞技投掷都未做好充分的准备。具体来说，投手’s 长期工作量 in this analysis was merely 30% of the average in-season 长期工作量 of high school pitchers.
在十一月（慢性= 4.0），这个投手真的不应该’他们甚至踩过一个土墩（预热时ACR大于1.3）。一月份（时间= 6.0），该投手可能会在ACR达到1.3之前承受14个游戏中的投手。在常规赛季（慢性= 15.5）中，投手可以承受足够的比赛投球（超过100个投球），同时将ACR保持在1.3以下。
A more advanced group of pitchers face a similar dilemma in regards to 长期工作量. Colleges enter each fall season with the goal of testing incoming freshmen and transfers to set initial rosters for the team. While many pitchers are under-prepared for the fall competition, an even more significant hurdle is placed on pitchers and teams—期末考试和圣诞节假期。
Seen below, the 长期工作量 of this collegiate pitcher peaks around 4.0 workload units at the end of October. As the academic schedule intensifies and team breaks from mandatory practices, the 长期工作量 declined by 50% leading into Christmas Break. The cessation of throwing over the following two weeks resulted in a near full depletion in 长期工作量.
Upon return to campus, the pitcher was left with a mere six weeks to build ample 长期工作量 for their spring break trip and season kick-off. College players and coaches need to be cognizant of this decline in 长期工作量 leading up to and during holiday break, and need to create appropriate throwing programs to maintain some level of chronic fitness during the winter.
Not only does this fitness of 长期工作量 decay, but most players are still in a state of not being trained enough when they break to their affiliate. Teams and players need to create long-term workload programs that build 长期工作量 well into the month of May.
A second anomaly of 长期工作量 decay occurs right after the all-star break. Often times, players are left with several days of rest, which causes the 长期工作量 to decline. If not managed properly, the acute spikes upon return may be too dramatic and may lead to high ACR.
Teams and players need to minimize the effect of travel time when affiliates break for season or the all-star break, and need to make sure workload programs continue to progress 长期工作量 safely when throwing resumes.
As the stakes get higher, the challenges of workload management do not subside. Even at the highest level of competition in baseball- the World Series- pitchers are prone to 长期工作量 decay that needs to be properly managed.
Rich Hill的工作负载模拟’2018赛季与标准的周中职业投手的工作量融合在一起。下面的分析表明希尔’s 长期工作量 decayed by nearly 20% in the post-season. The effect of this decline is significant. Rather than pitching deep into games with less fatigue, a 20% decline in 长期工作量 removed over 112 potential extra pitches for Hill.
However, given the need to remain agile in the 淡季 and fight for each win, the risk of bringing a pitcher to a fatigued state during non-game work is not the smartest thing to do. Therefore, the primary solution is to make a push to build more 长期工作量 after the All-Star break. If 长期工作量 is increased by significant levels, the natural taper that ensues in the 淡季 will not effect stamina and capacity of the pitching staff as much.
The best way to improve 长期工作量 after the All-Star break, is to move from a 5-man rotation, to a 6-man rotation. Seen below, a 6-man rotation allows for a 13% increase in 长期工作量. This is realized, as the 6-man rotation allows for greater between-start workloads than a typical 5-man rotation.
Whether in high school, college, the minor leagues, or the big leagues, workload management can be a powerful tool to increase throwing capacity and avoid 受伤风险. Specific to the motusTHROW sleeve, the tool is only usable in a helpful manner. This clinically validated tool has the ability to measure the 长期工作量 throughout a season and career, and also provides fatigue measures via the acute:chronic ratio. Furthermore, the workload data generated by the sleeve empowers coaches, performance staff, physical therapists and parents with the ability to program out safe throwing routines with precision and care.