Dominic Stone
Muscle load is a term used to describe the amount of mechanical energy (kJ) produced by an individual during a training session. Muscle load is calculated by multiplying the average power during a training session with the duration of the session. It is used to quantify training loads in anaerobic high-intensity training sessions, such as short intervals, sprints, and hill sessions, where heart rate is not a good indicator of training load. Muscle load can be measured using a running or cycling sport profile, with certain devices calculating running power from the wrist without any external sensors.
| Characteristics | Values |
|---|---|
| Definition | Measures the strain a training session causes to your musculoskeletal system |
| Calculation | Multiply your average power during a training session with the duration of the session |
| Typical range | 700-1400 in a 60-minute running session and 360-720 in a 60-minute cycling session |
| Measurement | Calculated from power data from running and cycling sessions |
| Perceived load | Derived from RPE (your evaluation of how hard the session was on a scale of 1-10) and duration |
| Perceived load calculation | Perceived Load = RPE x duration |
| Perceived load range | 180-360 for a 60-minute session |
| Muscular load classification | Static, median, and high intensity levels |
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What You'll Learn
- Muscle Load measures the strain on your musculoskeletal system
- It is calculated from power data in running and cycling sessions
- Mechanical energy produced during a session is measured in kJ
- Muscular blood flow disruption is important for muscle fatigue
- Muscular load is evaluated in ergonomics, biomechanics, and sports research
Muscle Load measures the strain on your musculoskeletal system
Muscle Load is automatically calculated from your power data from your running and cycling sessions. For running, this is calculated from your wrist without any external sensors, while cycling sessions require a cycling power meter. The numeric value for Muscle Load typically ranges from 700 to 1400 in a 60-minute running training session and 360 to 720 in a 60-minute cycling training session.
Muscle Load is also used in the field of biomechanics to measure the muscular load that muscles are subjected to during a period or task, such as during a normal workday. This is done using Jonsson's method of Amplitude Probability Distribution Analysis (APDA) of acquired EMG signals. The APDA calculates the cumulative percentage histogram of the enveloped data in terms of the Maximum Voluntary Contraction (MVC) of the monitored muscle. This is used as a reference value for muscle load classification in static, median, and high-intensity levels.
High-intensity muscular load can cause muscles to fail to produce the required force for a task, leading to severe musculoskeletal disorders when the continuous fatigue outbalances the body's natural recovery mechanisms.
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It is calculated from power data in running and cycling sessions
Muscle load is a measure of the strain a training session puts on your musculoskeletal system, which is made up of your joints, muscles, and skeletal system. It is particularly useful for quantifying training loads in anaerobic high-intensity training sessions, such as short intervals, sprints, and hill sessions, where your heart rate doesn't have time to react to the changes in intensity.
Muscle load is calculated from power data in running and cycling sessions. It is determined by multiplying your average power during a training session with the duration of the session. The formula for muscle load is: Muscle Load = Average Power x Duration. The unit of measurement for muscle load is typically in kJ (kilojoules) of mechanical energy produced.
For example, in a 60-minute running training session, the muscle load values typically range from 700 to 1400 kJ. On the other hand, in a 60-minute cycling training session, the muscle load values are generally lower, ranging from 360 to 720 kJ.
It's important to note that muscle load calculations may vary between running and cycling due to differences in eccentric muscle contractions. Running involves more eccentric contractions, which can result in higher training load tolerances compared to cycling. As a result, the power data from running sessions may be affected by the duration and intensity of the session, as well as the presence of hills and high-intensity intervals.
To obtain muscle load data for running, GPS availability is required. For cycling, a cycling power meter, such as a strain-gauge-based direct-force power meter (DFPM), is used to capture power data. These power meters can instantly measure short-duration, high-power bursts, which are common in cycling.
Additionally, it's worth mentioning that power-based training has been a longer-standing practice in cycling compared to running, and there are distinct differences in the power metrics and assumptions between the two activities.
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Mechanical energy produced during a session is measured in kJ
Muscle load is a measure of the strain a training session puts on an individual's musculoskeletal system, which includes joints, muscles, and the skeletal system. It is particularly useful for quantifying training loads in anaerobic high-intensity training sessions, such as short intervals, sprints, and hill sessions, where heart rate alone may not be sufficient to measure the intensity of the workout.
Muscle load is calculated by multiplying the average power during a training session with the duration of the session. The unit of measurement for muscle load is kilojoules (kJ), which is a measure of mechanical energy. One kilojoule is equal to 1000 joules, and it represents the amount of work done when a force of one newton is applied over a distance of one meter.
During a workout, an individual's muscles undergo contraction, which is the activation of tension-generating sites within muscle cells. There are three types of muscle contractions: isotonic, concentric, and eccentric. In isotonic contraction, muscle length can change, but the tension in the muscle remains constant as the muscle's force of contraction matches the total load. In a concentric contraction, the muscle tension is sufficient to overcome the load, causing the muscle to shorten as it contracts. Eccentric contraction occurs when the tension generated is insufficient to overcome the external load, resulting in the lengthening of muscle fibers.
The amount of mechanical energy produced during a session, or Muscle Load, is calculated by multiplying the average power during the session with its duration. This value is typically presented in kilojoules (kJ). For example, in a 60-minute running session, the Muscle Load can range from 700 to 1400 kJ, while in a 60-minute cycling session, it typically falls between 360 and 720 kJ.
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Muscular blood flow disruption is important for muscle fatigue
Muscle load refers to the amount of mechanical energy (in kJ) that an individual produces during a running or cycling session. It is calculated by multiplying the average power during a training session with the duration of the session. Muscle load is an important metric in quantifying training loads in anaerobic high-intensity training sessions, such as short intervals, sprints, and hill sessions.
During dynamic exercise, the ability to reach volitional failure at the muscular level may depend on generating a contraction strong enough to disrupt muscle blood flow. If the exercise load is too low, the muscular size and strength adaptations may be attenuated. This is supported by studies that show similar increases in muscle size and strength when training with lower loads (30% 1RM) to volitional failure compared to high-load resistance training.
However, there may be a threshold below which the external training load is too low to fully stimulate muscular adaptations. For example, a 12-week training protocol comparing 70% 1RM and 15.5% 1RM found that muscle size and strength adaptations favored the high-load condition. Additionally, it is unknown if training to failure with very low loads can stimulate similar muscular adaptations compared to traditional high-load protocols.
Applying blood flow restriction (BFR) to the limb is a strategy used to disrupt muscular blood flow and increase muscle fatigue during low-load exercises. This technique can be utilized to enhance the effectiveness of low-load exercises and promote muscular adaptations. However, further research is needed to determine the optimal level of blood flow restriction pressure required to achieve muscle fatigue at very low loads.
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Muscular load is evaluated in ergonomics, biomechanics, and sports research
Muscle load is a measure of the strain a training session puts on an individual's musculoskeletal system, which includes the joints, muscles, and skeletal system. It is often evaluated in ergonomics, biomechanics, and sports research.
Ergonomics
Ergonomics is concerned with the quantification of muscle load in occupational work situations. For instance, a study by Chaffin and Park (1973) found that the incidence of low back pain was correlated with higher lifting strength requirements. This evaluation considered both the location and magnitude of the load lifted, highlighting the importance of load moment in biomechanical logic.
Another study by Marras and colleagues (1993, 1995) evaluated over 400 industrial jobs, observing 114 workplace and worker-related variables. They found that exposure to load moment was the single most powerful predictor of low back disorder reporting. This evaluation considered the load magnitude, the distance of the load from the spine, and the frequency of exposure to lifts of different magnitudes.
Biomechanics
Biomechanics also plays a crucial role in understanding muscular load, especially in the workplace. For instance, Norman and associates (1998) assessed the cumulative biomechanical loading of the spine in automotive assembly workers. They identified four independent factors for low back disorder reporting: integrated load moment over a work shift, hand forces, peak shear force on the spine, and peak trunk velocity. This evaluation considered the complex trunk motion patterns and the magnitude of trunk combined velocities.
Sports Research
In sports research, muscular load is often evaluated through measures of training load, which can include Cardio Load and Muscle Load. Cardio Load measures the cardiac response to a training session, while Muscle Load measures the strain on the musculoskeletal system. Muscle Load is calculated by multiplying the average power during a training session with the duration of the session.
Additionally, Rate of Perceived Exertion (RPE) is a subjective measure of exercise load that is often used in sports training. It is based on an individual's evaluation of the intensity of a training session and is quantified using a scale from 1 (very, very easy) to 10 (maximum effort). RPE can be useful in sports where measuring training load based on heart rate alone has limitations, such as strength training.
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Frequently asked questions
Muscle load is a measure of the amount of mechanical energy (kJ) produced during a running or cycling session.
Muscle load is calculated by multiplying the average power during a training session with the duration of the session.
The unit of muscle load is kJ (kilojoules).
The typical muscle load value for a 60-minute running training session ranges from 700 to 1400 kJ.
You can measure muscle load using the Muscle Load Analysis add-on from PLUX Biosignals, which is designed for online and offline evaluation of muscular load.
