Therapy Dosage Planner
Track your therapy dosage with our free sports calculator. Get personalized stats, rankings, and performance comparisons.
Calculator
Adjust values & calculateWeekly Progression Plan
Formula
Weekly Dose calculates raw therapy volume. Intensity-Weighted Dose adjusts for exercise difficulty. Recovery Factor reduces dose for higher severity injuries (0.6 for severe, 0.8 for moderate, 1.0 for mild). Calories per session estimate uses metabolic equivalent calculations based on body weight and intensity.
Last reviewed: December 2025
Worked Examples
Example 1: Post-ACL Reconstruction Rehabilitation
Example 2: Sports Massage Therapy Schedule
Background & Theory
The Therapy Dosage Planner applies the following established principles and formulas. Sports statistics and performance metrics represent one of the most data-rich domains of applied mathematics available to the general public. Baseball, in particular, has developed an exceptionally dense vocabulary of calculated metrics. Earned run average (ERA) quantifies a pitcher's effectiveness as (earned runs × 9) / innings pitched, normalising performance to a nine-inning standard regardless of how many complete games were pitched. WHIP, or walks and hits per inning pitched, is computed as (walks + hits) / innings pitched and provides a complementary measure of how frequently a pitcher allows baserunners. Batting average, one of the oldest statistics in the sport, is simply hits / at-bats, though more modern metrics such as on-base percentage and slugging percentage have largely supplanted it as primary performance indicators. The NFL passer rating formula is considerably more complex, combining completion percentage, yards per attempt, touchdown rate, and interception rate into a composite score scaled to a 0–158.3 range. Golf handicap calculation, now governed by the World Handicap System introduced in 2020, uses a Handicap Differential formula applied to the best 8 of a player's most recent 20 score differentials, with adjustments for course rating and slope. The Elo rating system, originally developed by physicist Arpad Elo for chess ranking in the 1960s, has become a widely adopted framework for competitive ranking in sports ranging from football to table tennis. It updates each player's rating after every match based on the margin of expected versus actual result. In endurance sports, pace calculation converts total time to a per-mile or per-kilometre rate, informing training intensity and race strategy. In cycling, power-to-weight ratio (watts per kilogram) is the primary determinant of climbing performance and is central to both professional race analysis and amateur fitness tracking. Fantasy sports scoring systems synthesise multiple individual statistics into aggregate point totals, requiring participants to understand the relative value of different performance categories across sports.
History
The history behind the Therapy Dosage Planner traces back through the following developments. Organised athletic competition has roots extending to ancient Greece, where the Olympic Games were held at Olympia beginning around 776 BCE. These early games were embedded in religious observance and civic identity, featuring events such as sprinting, wrestling, and the pentathlon. The codification of modern sport rules accelerated dramatically in 19th century Britain, where industrialisation created both the leisure time and the institutional infrastructure for organised competition. The Football Association formalised the rules of association football in 1863, and similar governing bodies for cricket, rugby, tennis, and athletics followed in subsequent decades. Pierre de Coubertin, a French educator inspired by the English model of sport as character-building, campaigned to revive the Olympic Games as a modern international institution. The first modern Summer Olympics were held in Athens in 1896, establishing the template for international multi-sport competition that has continued to the present. FIFA, the international governing body for association football, was founded in Paris in 1904 with seven member nations. The serious statistical analysis of baseball, later termed sabermetrics, was pioneered by writers and analysts including Bill James beginning in the late 1970s. James self-published his Baseball Abstract annuals starting in 1977, introducing rigorous empirical methods to a domain previously dominated by traditional counting statistics and subjective scouting. His work influenced a generation of analysts and front-office executives. The publication of Michael Lewis's Moneyball in 2003, documenting the Oakland Athletics' 2002 season and their use of on-base percentage and other undervalued metrics, brought sports analytics to mainstream attention. The subsequent analytics revolution reshaped hiring practices and game strategy across professional sports leagues. Fantasy sports, which require participants to engage directly with statistical outputs, grew from a hobby practised by a few thousand enthusiasts in the 1980s into a multi-billion dollar industry by the 2010s, with tens of millions of participants across football, baseball, basketball, and other sports.
Frequently Asked Questions
Formula
Weekly Dose = Session Minutes x Sessions/Week | Intensity-Weighted Dose = Weekly Dose x (Intensity/10) | Adjusted Dose = Weekly Dose x Recovery Factor
Weekly Dose calculates raw therapy volume. Intensity-Weighted Dose adjusts for exercise difficulty. Recovery Factor reduces dose for higher severity injuries (0.6 for severe, 0.8 for moderate, 1.0 for mild). Calories per session estimate uses metabolic equivalent calculations based on body weight and intensity.
Worked Examples
Example 1: Post-ACL Reconstruction Rehabilitation
Problem: A 75 kg patient recovering from ACL surgery (severity 8/10) plans 45-minute sessions, 4 times per week, at intensity 4/10 for 12 weeks.
Solution: Weekly dose = 45 x 4 = 180 minutes/week\nIntensity-weighted dose = 180 x (4/10) = 72 minutes\nRecovery factor (severity 8) = 0.6\nAdjusted weekly dose = 180 x 0.6 = 108 minutes\nTotal sessions = 4 x 12 = 48 sessions\nTotal dose = 180 x 12 = 2,160 minutes\nCalories per session = (45/60) x 75 x 3.5 x 0.4 = 78.75 kcal
Result: Weekly Dose: 180 min | Adjusted: 108 min | 48 total sessions | Load Rating: Moderate
Example 2: Sports Massage Therapy Schedule
Problem: An 85 kg athlete with mild muscle strain (severity 3/10) plans 60-minute sessions, 3 times per week, at intensity 6/10 for 6 weeks.
Solution: Weekly dose = 60 x 3 = 180 minutes/week\nIntensity-weighted dose = 180 x (6/10) = 108 minutes\nRecovery factor (severity 3) = 1.0\nAdjusted weekly dose = 180 x 1.0 = 180 minutes\nTotal sessions = 3 x 6 = 18 sessions\nTotal dose = 180 x 6 = 1,080 minutes\nCalories per session = (60/60) x 85 x 3.5 x 0.6 = 178.5 kcal
Result: Weekly Dose: 180 min | Adjusted: 180 min | 18 total sessions | Load Rating: Moderate
Frequently Asked Questions
What is a therapy dosage planner and why is it important?
A therapy dosage planner is a structured tool that calculates the optimal volume, intensity, and frequency of therapeutic exercise sessions needed for rehabilitation. Just like medication requires precise dosing, physical therapy must balance enough stimulus to promote healing without overloading injured tissue. The planner considers session duration, frequency per week, exercise intensity, injury severity, and total program length to generate a progressive treatment plan. Research consistently shows that properly dosed therapy programs achieve 30 to 40 percent faster recovery outcomes compared to ad hoc approaches where volume and intensity are not systematically managed.
How do I determine the right intensity level for therapy sessions?
Therapy intensity should be determined using a combination of perceived exertion scales, pain monitoring, and functional capacity assessments. The modified Borg scale from 1 to 10 is commonly used, where 1 represents minimal effort and 10 represents maximum exertion. For early-stage rehabilitation, intensities of 3 to 4 are typically appropriate to avoid aggravating the injury. Mid-stage rehab usually operates at 5 to 7 intensity, focusing on progressive loading. Late-stage rehab and return-to-sport phases may reach 8 to 9 intensity. Pain should generally stay below 4 out of 10 during exercises, and any sharp or increasing pain signals that intensity needs to be reduced immediately.
What is the optimal number of therapy sessions per week?
The optimal session frequency depends on injury type, severity, recovery stage, and individual healing capacity. Acute injuries in early rehabilitation typically benefit from 5 to 6 sessions per week at low intensity to maintain range of motion and reduce swelling. Moderate injuries in the mid-rehabilitation phase generally respond best to 3 to 4 sessions per week, allowing adequate recovery between sessions for tissue adaptation. Chronic conditions and maintenance programs may only require 2 to 3 sessions per week. Research indicates that exceeding optimal frequency can lead to overtraining and delayed healing, while insufficient frequency may result in deconditioning. Your therapist should adjust frequency based on your response to treatment.
How does injury severity affect the therapy dosage plan?
Injury severity directly determines starting intensity, progression rate, and total program duration for rehabilitation. Mild injuries rated 1 to 3 on a severity scale can typically begin therapy at moderate intensity and progress relatively quickly over 4 to 6 weeks. Moderate injuries rated 4 to 6 require a more conservative starting point with gradual intensity increases over 8 to 12 weeks. Severe injuries rated 7 to 10, including surgical repairs and significant tears, demand very low starting intensities with slow progression over 12 to 24 weeks or longer. The recovery factor applied to weekly dosage calculations decreases as severity increases, reflecting the reduced tissue tolerance of more seriously injured structures.
What is the weekly therapy dose and how is it calculated?
The weekly therapy dose is calculated by multiplying session duration in minutes by the number of sessions per week, giving total therapeutic minutes per week. This raw volume is then modified by intensity level to produce an intensity-weighted dose that more accurately reflects the actual physiological stimulus applied to healing tissues. For example, three 45-minute sessions at intensity 7 equals 135 minutes of raw weekly dose and 94.5 intensity-weighted minutes. Research suggests that most musculoskeletal conditions respond optimally to 150 to 300 intensity-weighted minutes per week during active rehabilitation phases. Doses below this range may produce insufficient stimulus, while doses above 400 may exceed tissue adaptation capacity.
How should therapy intensity progress over a rehabilitation program?
Therapy intensity should follow a graduated progression model that starts conservatively and increases systematically as tissue healing and functional capacity improve. The general principle is to begin at approximately 50 to 60 percent of the target intensity during the first two weeks, allowing the body to adapt to the therapeutic exercises. From weeks 3 to 5, intensity can increase by 5 to 10 percent per week as pain and swelling responses are monitored. Weeks 6 to 8 typically see the largest intensity gains as tissue remodeling advances. The final phase should approach sport or activity specific intensities of 85 to 95 percent. Any setback in symptoms should trigger a temporary 20 to 30 percent intensity reduction followed by a more conservative re-progression.
References
Reviewed by Sher, Sports Science & Nutrition Specialist · Editorial policy