Practical Guide to Hip and Knee Strengthening

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Progressive Overload for Strength Development

General principles to consider with progressive overload:

• Remember TWO things when dealing with a patient who requires strengthening:
  • Establish the level of load they can currently cope with
  • Keep reassessing the situation as patient progresses
• Progressively expose an individual to load at a tissue and system level
• Maximum tolerated loads are necessary to generate supraphysiological stress and low level of micro failure to create adaptation
• Allow sufficient recovery time to enable adaptation
• Application of the appropriate load to drive the required adaptation
• Specific Adaptation to Imposed Demand (SAID) principle
  • Adaptations produced by training are highly specific to the nature of the stimulus or overload applied
  • Adaptations are specific to strength, power, endurance, functional activity, joint angle, sequence of muscle activations, energy systems and virtually all other variables present
  • SAID principle is impacted by:
    • Position or length of the muscle (length-tension relationship)
    • Speed of contraction (force - velocity relationship)
    • Muscle contraction type (isometric, concentric, eccentric)
    • Percentage (%) repetition maximum
      • Training as a percentage of repetition maximum (RM)
        • e.g. 80% 1RM
      • Repetitions to failure
        • e.g. 80% 1RM = 7 - 10 repetitions to failure

Modified Daily Adjustable Progressive Resistance Exercise (DAPRE) System

• System introduced by Knight (ref)
• 5 RM TO 7 RM 4-set system
• System allows patients to train at fullest potential while still accounting for variations in strength levels
• Sets 1 and 2 are warm-up sets, sets 3 and 4 are maximum effort sets
• Sets are designed around a "working weight"
• The working weight is the weight used in set 3
• Weights used for sets 1 and 2 is a percentage of the working weight (set 1 uses 50% of the working weight, set 2 uses 75% of working weight, set 3 uses the full working weight)
• maximum repetitions performed in set 3 determines the weight to be used in set 4
• number of repetitions performed in set 4 is used to determine the working weight for the next training session
• this system is ideal for rehabilitation, regardless of the degree of the patient's strength or deconditioning
• Recommended article to read: The Daily Adjustable Progressive Resistance Exercise System: Getting Reacquainted With an Old Friend

Table 1. DAPRE System

Set	Weight	Number of repetitions
1	50% of working weight	10
2	75 % of working weight	6
3	working weight	max
4	adjusted working weight	max

Guidelines for modification of working weight in DAPRE system

Number of repetitions performed during set 3	Set 4	Next session
0 - 2	decrease 2.5 - 5 kg (5 - 10 lbp)	decrease 2.5 - 5 kg (5 - 10 lbp)
3 - 4	decrease 2.5 kg (5 lbp)	keep the same
5 -6	keep the same	increase 2.5 - 5 kg (5 - 10 lbp)
7 -10	increase 2.5 - 5 kg (5 - 10 lbp)	increase 2.5 - 7.5 kg (5 - 15 lbp)
more than 11	increase 5 - 7.5 kg (10 - 15 lbp)	increase 5 - 10 kg (10 - 20 lbp)

Isolated Muscle Work Around 4 Muscle Groups

Isolated muscle work presented as the amount of electromyographic (EMG) activity. It is important to know that for strengthening purposes the level of EMG activity needs to be greater than 70 - 80% of an individual's maximum isometric voluntary contraction (MIVC)

Repetition to failure of a selected exercise needs to be between 8 -10 repetitions for strength training

Gluteus Maximus

Link to anatomy

Rank Order

Table Rank order of exercises for recruitment of gluteus maximus based on EMG

Exercise	% MIVC
Front plank with hip extended	100
Single leg squat	72
Side plank (average of side plank dominant leg up and side plank dominant leg down)	71
Lateral step up	64
Single leg deadlift	59
Forward step-up	55
Single leg bridge	54
Hip clam	53

Below are some examples of exercises targeting gluteus maximus:

Progression of Bridging Exercise

The three videos below provide an example of progressing the bridge exercise. Bridging with one leg straight produces significantly greater EMG activity in gluteus maximus and gluteus medius. Lecheka The addition of a band to the exercise further increases gluteal activity. (Forman 2023)

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